TSUNOGAI Urumu

J-GLOBAL         Last updated: May 8, 2019 at 04:18
 
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Name
TSUNOGAI Urumu
E-mail
urumunagoya-u.jp
Affiliation
Nagoya University
Section
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Global Geochemistry
Job title
Professor
Degree
PhD(The University of Tokyo)
Research funding number
50313367
ORCID ID
0000-0002-1517-3284

Research Areas

 
 

Academic & Professional Experience

 
Apr 1996
 - 
Feb 1997
Research fellow of the JSPS, The University of Tokyo
 
Mar 1997
 - 
Mar 1999
Research fellow of the JST
 
Apr 1999
 - 
Mar 2000
Lecturer, Tokyo Institute of Technology
 
Apr 2000
 - 
Mar 2012
Associate Professor, Faculty of Science, Hokkaido University
 
Apr 2012
 - 
Today
Professor, Graduate School of Environmental Studies Department of Earth and Environmental Sciences Global Geochemistry, Nagoya University
 
Apr 2012
 - 
Today
Professor, Graduate School of Environmental Studies, Nagoya University
 

Education

 
Apr 1987
 - 
Mar 1991
Faculty of Science, The University of Tokyo
 
Apr 1991
 - 
Mar 1993
Graduate School, Division of Science, The University of Tokyo
 
Apr 1993
 - 
Mar 1996
Graduate School, Division of Science, The University of Tokyo
 

Awards & Honors

 
Sep 2017
The Geochemical Society of Japan Award, The Geochemical Society of Japan
 
Apr 2016
Oceanochemistry Award, Research Institute for Oceanochemistry Foundation
 

Published Papers

 
Nakagawa Fumiko, Tsunogai Urumu, Obata Yusuke, Ando Kenta, Yamashita Naoyuki, Saito Tatsuyoshi, Uchiyama Shigeki, Morohashi Masayuki, Sase Hiroyuki
BIOGEOSCIENCES   15(22) 7025-7042   Nov 2018
Onishi Yuji, Shimamura Sho, Yamanaka Toshiro, Nakayama Rei, Ozaki Ken-Ichi, Miyazaki Masayuki, Tsunogai Urumu, Fujiwara Yoshihiro
MARINE BIOLOGY   165(9)    Sep 2018
Oanh Thi Ngoc Bui, Kameyama Sohiko, Yoshikawa-Inoue Hisayuki, Ishii Masao, Sasano Daisuke, Uchida Hiroshi, Tsunogai Urumu
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY   70    Aug 2018
Ijiri Akira, Inagaki Fumio, Kubo Yusuke, Adhikari Rishi R., Hattori Shohei, Hoshino Tatsuhiko, Imachi Hiroyuki, Kawagucci Shinsuke, Morono Yuki, Ohtomo Yoko, Ono Shuhei, Sakai Sanae, Takai Ken, Toki Tomohiro, Wang David T., Yoshinaga Marcos Y., Arnold Gail L., Ashi Juichiro, Case David H., Feseker Tomas, Hinrichs Kai-Uwe, Ikegawa Yojiro, Ikehara Minoru, Kallmeyer Jens, Kumagai Hidenori, Lever Mark A., Morita Sumito, Nakamura Ko-ichi, Nakamura Yuki, Nishizawa Manabu, Orphan Victoria J., Roy Hans, Schmidt Frauke, Tani Atsushi, Tanikawa Wataru, Terada Takeshi, Tomaru Hitoshi, Tsuji Takeshi, Tsunogai Urumu, Yamaguchi Yasuhiko T., Yoshida Naohiro
SCIENCE ADVANCES   4(6)    Jun 2018
Ijiri Akira, Iijima Koichi, Tsunogai Urumu, Ashi Juichiro, Inagaki Fumio
GEOSCIENCES   8(6)    Jun 2018
Nelson David M., Tsunogai Urumu, Ding Dong, Ohyama Takuya, Komatsu Daisuke D., Nakagawa Fumiko, Noguchi Izumi, Yamaguchi Takashi
ATMOSPHERIC CHEMISTRY AND PHYSICS   18(9) 6381-6392   May 2018
Tsunogai Urumu, Miyauchi Takanori, Ohyama Takuya, Komatsu Daisuke D., Ito Masanori, Nakagawa Fumiko
LIMNOLOGY AND OCEANOGRAPHY   63 S458-S476   Mar 2018
Ino Kohei, Hernsdorf Alex W., Konno Uta, Kouduka Mariko, Yanagawa Katsunori, Kato Shingo, Sunamura Michinari, Hirota Akinari, Togo Yoko S., Ito Kazumasa, Fukuda Akari, Iwatsuki Teruki, Mizuno Takashi, Komatsu Daisuke D., Tsunogai Urumu, Ishimura Toyoho, Amano Yuki, Thomas Brian C., Banfield Jillian F., Suzuki Yohey
ISME JOURNAL   12(1) 31-47   Jan 2018
Lee Jun-Ho, Woo Han Jun, Son Seung-Kyu, Kim Moonkoo, Lee Dong-Hun, Tsunogai Urumu, Jeong Kap-Sik
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING   53(5) 457-466   2018
Suzuki, Y., K. Ino, A. Hernsdorf, U. Konno, M. Kouduka, K. Yanagawa, M. Sunamura, A. Hirota, Y. Togo, K. Ito, A. Fukuda, T. Iwatsuki, T. Mizuno, D. Komatsu, U. Tsunogai, T. Ishimura, Y. Amano, B. Thomas, J. Banfield, and S. Kato
The ISME Journal      Sep 2017   [Refereed]
Toki Tomohiro, Iwata Daigo, Tsunogai Urumu, Komatsu Daisuke D., Sano Yuji, Takahata Naoto, Hamasaki Hiroshi, Ishibashi Jun-ichiro
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   330 24-35   Jan 2017
Miyakawa Kazuya, Ishii Eiichi, Hirota Akinari, Komatsu Daisuke D., Ikeya Kosuke, Tsunogai Urumu
APPLIED GEOCHEMISTRY   76 218-231   Jan 2017
Toki, T., A. Hamamoto, M. Tawata, J. Miyazaki, K. Nakamura, M. Abe, K. Takai, Y. Sano, N. Takahata, U. Tsunogai, J. Ishibashi
Chemical Geology   447 208-218   Dec 2016   [Refereed]
Toki, T., M. Itoh, D. Iwata, S. Ohshima, R. Shinjo, J. Ishibashi, U. Tsunogai, N. Takahata, Y. Sano, T. Yamanaka, A. Ijiri, N. Okabe, T. Gamo, Y. Muramatsu, Y. Ueno, S. Kawagucci, and K. Takai
Geochemical Journal   50(6) 493-525   Dec 2016   [Refereed]
Nobuhara, T., D. Onda, T. Sato, H. Aosawa, T. Ishimura, A. Ijiri, U. Tsunogai, N. Kikuchi, Y. Kondo, and S. Kiel
Paläontologische Zeitschrift   90(4) 701–722   Dec 2016   [Refereed]
Tsunogai, U., L. Cheng, M. Ito, D. D. Komatsu, F. Nakagawa, and H. Shinoara
Geophysical Research Letters   43(22) 11620-11627   Nov 2016   [Refereed]
Sadekov, A., K. Darling, T. Ishimura, C. Wade, K. Kimoto, A. Singh, P. Anand, D. Kroon, S. Jung, G. Ganssen, R. Ganneshram, U. Tsunogai, and H. Elderfield
Paleoceanography   31(10) 1440-1452   Oct 2016   [Refereed]
Kagoshima, T., Y. Sano, N. Takahata, A. Ishida, Y. Tomonaga, E. Roulleau, D. L. Pinti, T. P. Fischer, T. Lan, Y. Nishio and U. Tsunogai
Journal of Volcanology and Geothermal Research   325 179-188   Oct 2016   [Refereed]
Wen, H.-Y., Y. Sano, N. Takahata, Y. Tomonaga, A. Ishida, K. Tanaka, T. Kagoshima, K. Shirai, J. Ishibashi, H. Yokose, U. Tsunogai, and T.F. Yang
Scientific Reports   6 doi:10.1038/srep34126   Sep 2016   [Refereed]
Yamazaki, A., T. Watanabe, U. Tsunogai, F. Iwase, H. Yamano
Paleoceanography   31(6) 838-846   Jun 2016   [Refereed]
Tsunogai, U., T. Miyauchi, T. Ohyama, D.D. Komatsu, F. Nakagawa, Y. Obata, K. Sato, and T. Ohizumi
Biogeosciences   13 3441-3459   Jun 2016   [Refereed]
Ino, K., U. Konno, M. Kouduka, A. Hirota, Y. Togo, A. Fukuda, D. Komatsu, U. Tsunogai, A.S. Tanabe, S. Yamamoto, T. Iwatsuki, T. Mizuno, K. Ito, Y. Suzuki
Environmental Microbiology Reports   8(2) 285-294   Apr 2016   [Refereed]
Tsunogai, Urumu, and Fumiko Nakagawa
Earozoru Kenkyu   31(1) 5-14   Mar 2016   [Refereed][Invited]
In this paper, recent advances in using stable isotopes of atmospheric nitrate to trace the origin and fate are reviewed. While nitrogen isotopes have been used as the indicators of NOx source contributions to the atmospheric nitrate, cautions mus...
The GEOTRACES Group
Marine Chemistry   177(1) 1-8   Dec 2015   [Refereed]
Gamo, T., K. Okamura, H. Hatanaka, H. Hasumoto, D. Komatsu, M. Chinen, M. Mori, J. Tanaka, A. Hirota, U. Tsunogai, K. Tamaki
Deep-Sea Research Part II   121 62-70   Nov 2015   [Refereed]
Ishibashi, J. U. Tsunogai, T. Toki, N. Ebina, T. Gamo, Y. Sano, H. Masuda, H. Chiba
Deep-Sea Research Part II   121 126-136   Nov 2015   [Refereed]
Yamazaki, A., T. Watanabe, U. Tsunogai, H. Hasegawa, H. Yamano
Coral Reefs   34(1) 353-362   Mar 2015   [Refereed]
Suzuki, Y., U. Konno, A. Fukuda, D.D. Komatsu, A. Hirota, Y. Togo, N. Morikawa, H. Hagiwara, D. Aosai, T. Iwatsuki, U. Tsunogai, S. Nagao, K. Ito, T. Mizuno
PLoS ONE   9(12) e113063   Dec 2014   [Refereed]
Toki, Tomohiro, Jun-ichiro Ishibashi, Takuroh Noguchi, Miki Tawata, Urumu Tsunogai, Toshiro Yamanaka, Kentaro Nakamura
Subseafloor Biosphere Linked to Hydrothermal Systems   587-602   Nov 2014   [Refereed][Invited]
Yamanaka, T., H. Nagashio, R. Nishio, K. Kondo, T. Noguchi, K. Okamura, T. Nunoura, H. Makita, K. Nakamura, H. Watanabe, K. Inoue, T. Toki, K. Iguchi, U. Tsunogai, R. Nakada, S. Ohshima, S. Toyoda, J. Kawai, N. Yoshida, A. Ijiri, and M. Sunamura
Subseafloor Biosphere Linked to Hydrothermal Systems   497-504   Nov 2014   [Refereed]
Toki, T., R. Higa, A. Ijiri, U. Tsunogai and J. Ashi
Earth Planets and Space   66 doi:10.1186/s40623-014-0137-3   Oct 2014   [Refereed]
Tsunogai, U., Komatsu, D. D., Ohyama, T., Suzuki, A., Nakagawa, F., Noguchi, I., Takagi, K., Nomura, M., Fukuzawa, K., Shibata, H.
Biogeosciences   11(19) 5411–5424   Oct 2014   [Refereed]
Isotopes in Environmental Sciences: 3, Appling stable isotopes for studying behavior of trace components
Tsunogai, U., F. Nakagawa
Journal of Japan Society for Atmospheric Environment   49(5) A63-A72   Sep 2014   [Refereed][Invited]
Notsu, K., R. Sohrin, H. Wada, T. Tsuboi, H. Sumino, T. Mori, U. Tsunogai, P.A. Hernandez, Y. Suzuki, R. Ikuta, K. Oorui, M. Koyama, T. Masuda, N. Fujii
Journal of Volcanology and Geothermal Research   270 90-98   Jan 2014   [Refereed]
Origin of pore water in Kumano mud volcanoes
Toki, T., R. Higa, A. Tanahara, A. Ijiri, U. Tsunogai, J. Ashi
Chikyukagaku (Geochemistry)   47(4) 221-236   Dec 2013   [Refereed]
Katsuyama, C., Nashimoto, H., Nagaosa, K., Ishibashi, T., Kinoshita, T., Yoshikawa, H., Aoki, K., Asano, T., Sasaki, Y., Sohrin, R., Komatsu, D., Tsunogai, U., Kimura, H., Suwa, Y., Kato, K.
FEMS Microbiology Ecology   86(3) 532–543   Dec 2013   [Refereed]
Remote temperature sensing on volcanic fumaroles using HIReTS: Applications to Satsuma-Iwojima volcano, Japan
Tsunogai, U., D.D. Komatsu, F. Nakagawa
Bulltein of the Volcanological Society of Japan   58(3) 443-459   Sep 2013   [Refereed]
Kameyama, S., H. Tanimoto, S. Inomata, H. Y. Inoue, U. Tsunogai, A. Tsuda, M. Uematsu, M. Ishii, D. Sasano
Geophysical Research Letters   40(15) 3986-3990   Aug 2013   [Refereed]
Although much attention has been paid to describing the distribution of oceanic dimethyl sulfide (DMS) concentrations, establishing robust relationships between DMS concentrations and biological, physical, and chemical variables is still challengi...
Yamazaki, A., T. Watanabe, N. Takahata, Y. Sano, U. Tsunogai
Chemical Geology   351 276–280   Aug 2013   [Refereed]
Nakagawa, F., A. Suzuki, S. Daita, T. Ohyama, D.D. Komatsu, U. Tsunogai
Biogeosciences   10 3547-3558   Jun 2013   [Refereed]
Kitagawa, T., T. Ishimura, R. Uozato, K. Shirai, Y. Amano, A. Shinoda, T. Otake, U. Tsunogai, S. Kimura
Marine Ecology Progress Series      May 2013   [Refereed]
Konno, U., M. Kouduka, D.D. Komatsu, K. Ishii, A. Fukuda, U. Tsunogai, K. Ito, Y. Suzuki
Microbial Ecology   65(3) 626-637   Apr 2013   [Refereed]
von Glasow, R., T. Jickells, A. Baklanov, G.R. Carmichael, T. Church, L. Gallardo, C. Hughes, M. Kanakidou, P. Liss, L. Mee, R. Raine, P. Ramachandran, R. Ramesh, K. Sundseth, U. Tsunogai, M. Uematsu, T. Zhu
AMBIO   42(1) 13-28   Feb 2013   [Refereed]
Contribution of methane to total gas pressure in deep waters at lakes Nyos and Monoun (Cameroon, West Africa)
Issa, T. Ohba, F. Wilson, Y. Yoshida, F. Alain, M. Kusakabe, U. Tsunogai, Y. Oginuma, C. T. Boris, G. Tanyileke, S. Nkamdjou, H. Satake J.V. Hell
Geochemical Journal   47(3) 349-362   2013   [Refereed]
Tsunogai, U., K. Maegawa, S. Sato, D.D. Komatsu, F. Nakagawa, T. Toki, and J. Ashi
Earth and Planetary Science Letters   341-344 79-85   Aug 2012   [Refereed]
We report here the discovery of two methane-enriched plumes in a water column above the Kumano Knoll 5 submarine mud volcano (KK-5) in Nankai Trough during 2004; a slight methane enrichment was observed in this region in 2000 and 2010. The deeper ...
Ijiri, A., N. Harada, A. Hirota, U. Tsunogai, N.O. Ogawa, T. Itaki, B.-K. Khim, M. Uchida
Organic Geochemistry   48 47-55   Jul 2012   [Refereed]
Kato, S., K. Nakamura, T. Toki, J. Ishibashi, U. Tsunogai, A. Hirota, M. Ohkuma, A. Yamagishi
Frontiers in Microbiology   3    Mar 2012   [Refereed]
Kawagucci, S., Y.T. Yoshida, T. Noguchi, M.C. Honda, H. Uchida, H. Ishibashi, F. Nakagawa, U. Tsunogai, K. Okamura, Y. Takaki, T. Nunoura, J. Miyazaki, W. Lin, H. Kitazato, and K. Takai
Scientific Reports   2    Feb 2012   [Refereed]
The impacts of the M9.0 Tohoku Earthquake on deep-sea environment were investigated 36 and 98 days after the event. The light transmission anomaly in the deep-sea water after 36 days became atypically greater (similar to 35 %) and more extensive (...
Gamo, T., U. Tsunogai, A. Hirota, N. Nakayama, D.-J. Kang, K.-R. Kim
MARINE CHEMISTRY   128 92-99   Jan 2012   [Refereed]
We measured dissolved methane (CH4) and its carbon isotope ratio (C-13/C-12 or delta C-13) from surface to bottom seawaters (maximum depth: 3574 m) for the first time in three major offshore areas of the Japan Sea (East Sea): the easter...
The origin of methane in crustal fluids around the Ryukyu Islands
Tomohiro Toki, Ryutaro Honda, Kazuki Oomine, Daigo Iwata, Urumu Tsunogai, Daisuke D. Komatsu, Yuji Sano, Naoto Takahata, Jun-ichiro Ishibashi, Masataka Kinoshita, Hideyuki Yamashiro
Chikyukagaku (Geochemistry)   46(4) 257-274   2012   [Refereed]
Ishimura, T., Tsunogai, U., Hasegawa, S., Nakagawa, F., Oi, T., Kitazato, H., Suga, H., Toyofuku, T.
Biogeosciences   9 4353-4367   2012   [Refereed]
Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316
Geochemical Journal   46(2) 89-106   2012   [Refereed]
Komatsu, Daisuke D., Tsunogai, Urumu, Kamimura, Kanae, Konno, Uta, Ishimura, Toyoho, Nakagawa, Fumiko
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   25(21) 3351-3359   Nov 2011   [Refereed]
We have developed a new automated analytical system that employs a continuous flow isotope ratio mass spectrometer to determine the stable hydrogen isotopic composition (delta D) of nanomolar quantities of molecular hydrogen (H2) in an ...
Yamazaki, Atsuko, Watanabe, Tsuyoshi, Tsunogai, Urumu
GEOPHYSICAL RESEARCH LETTERS   38    Oct 2011   [Refereed]
Understanding tropical nutrient dynamics is essential for quantifying marine productivity. In tropical and subtropical oceans, however, the spatial and continuous observation of nutrients has been scarce because of low nutrient concentration. The ...
Tsunogai, U., K. Kamimura, S. Anzai, F. Nakagawa, D.D. Komatsu
GEOCHIMICA ET COSMOCHIMICA ACTA   75(16) 4531-4546   Aug 2011   [Refereed]
In high-temperature volcanic fumaroles (>400 degrees C), the isotopic composition of molecular hydrogen (H2) reaches equilibrium with that of the fumarolic H2O. In this study, we used this hydrogen isotope exchange equilibriu...
Nakada, Ryoichi, Takahashi, Yoshio, Tsunogai, Urumu, Zheng, Guodong, Shimizu, Hiroshi, Hattori, Keiko H.
APPLIED GEOCHEMISTRY   26(7) 1065-1076   Jul 2011   [Refereed]
A comprehensive study was performed to characterize, for the first time, the mud, water, and gases released from onshore mud volcanoes located in the southern margin of the Junggar Basin, northwestern China. Chemical compositions of mud, along wit...
Gay, A., Takano, Y., Gilhooly, III, W. P., Berndt, C., Heeschen, K., Suzuki, N., Saegusa, S., Nakagawa, F., Tsunogai, U., Jiang, S. Y., Lopez, M.
GEOFLUIDS   11(1) 34-47   Feb 2011   [Refereed]
We analyse the fluid flow regime within sediments on the Eastern levee of the modern Mississippi Canyon using 3D seismic data and downhole logging data acquired at Sites U1322 and U1324 during the 2005 Integrated Ocean Drilling Program (IODP) Expe...
Saito, Takuya, Stein, Olaf, Tsunogai, Urumu, Kawamura, Kimitaka , Nakatsuka, Takeshi, Gamo, Toshitaka, Yoshida, Naohiro
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   116    Jan 2011   [Refereed]
The atmospheric mixing ratios of ethane and its stable carbon isotope ratios (delta13C) were measured over the North Pacific (2 degrees N to 38 degrees N, 140 degrees E to 90 degrees W) during oceanographic cruises in summer and autumn....
Application of PTR-MS to an incubation experiment of the marine diatom Thalassiosira pseudonana
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Suzuki, Koji, Komatsu, Daisuke D., Hirota, Akinari, Konno, Uta, Tsunogai, Urumu
GEOCHEMICAL JOURNAL   45(5) 355-363   2011   [Refereed]
Emission of trace gases from the marine diatom Thalassiosira pseudonana (CCMP 1335) was continuously monitored with a proton transfer reaction-mass spectrometry (PTR-MS) in an axenic batch culture system under a 13:11-h light:dark cycle. Substanti...
Tsunogai, U., Daita, S., Komatsu, D. D., Nakagawa, F., Tanaka, A.
BIOGEOSCIENCES   8(3) 687-702   2011   [Refereed]
The stable isotopic compositions of nitrate, including the 17O anomalies (Delta17O), were determined twice in 1 yr (June and August 2007) in the oligotrophic water column of Lake Mashu, Japan. These data were then used to qua...
Watsuji, Tomo-o, Nakagawa, Satoshi, Tsuchida, Shinji, Toki, Tomohiro, Hirota, Akinari, Tsunogai, Urumu, Takai, Ken
MICROBES AND ENVIRONMENTS   25(4) 288-294   Dec 2010   [Refereed]
The galatheid crab, Shinkaia crosnieri (Decapoda: Galatheidae), forms dense colonies in the Iheya North and Hatoma Knoll deep-sea hydrothermal fields and has numerous setae covered with filamentous epibiotic microorganisms. Molecular phylogenetic ...
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Tsunogai, Urumu, Ooki, Atsushi, Takeda, Shigenobu, Obata, Hajime, Tsuda, Atsushi, Uematsu, Mitsuo
MARINE CHEMISTRY   122(40912) 59-73   Oct 2010   [Refereed]
We developed an equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) system for high-resolution measurement of the concentrations of multiple volatile organic compounds (VOCs) dissolved in seawater. The equilibration of five V...
Fukuda, Akari, Hagiwara, Hiroki, Ishimura, Toyoho, Kouduka, Mariko, Ioka, Seiichiro, Amano, Yuki, Tsunogai, Urumu, Suzuki, Yohey, Mizuno, Takashi
MICROBIAL ECOLOGY   60(1) 214-225   Jul 2010   [Refereed]
Although deep subterranean crystalline rocks are known to harbor microbial ecosystems, geochemical factors that constrain the biomass, diversity, and metabolic activities of microorganisms remain to be clearly defined. To better understand the geo...
Hirota, A., Tsunogai, U., Komatsu, D. D., Nakagawa, F.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   24(7) 1085-1092   Apr 2010   [Refereed]
We have developed a rapid, sensitive, and automated analytical system to simultaneously determine the concentrations and stable isotopic compositions (delta15N, delta(18)O, and delta13C) of nanomolar quantities of nitrous oxi...
Nunoura, Takuro, Oida, Hanako, Nakaseama, Miwako, Kosaka, Ayako , Ohkubo, Satoru B., Kikuchi, Toru, Kazama, Hiromi, Hosoi-Tanabe, Shoko, Nakamura, Ko-ichi, Kinoshita, Masataka, Hirayama, Hisako, Inagaki, Fumio, Tsunogai, Urumu, Ishibashi, Jun-ichiro, Takai, Ken
APPLIED AND ENVIRONMENTAL MICROBIOLOGY   76(4) 1198-1211   Feb 2010   [Refereed]
A variety of archaeal lineages have been identified using culture-independent molecular phylogenetic surveys of microbial habitats occurring in deep-sea hydrothermal environments such as chimney structures, sediments, vent emissions, and chemosynt...
Tsunogai, U., Komatsu, D. D., Daita, S., Kazemi, G. A., Nakagawa, F., Noguchi, I., Zhang, J.
ATMOSPHERIC CHEMISTRY AND PHYSICS   10(4) 1809-1820   2010   [Refereed]
The stable isotopic compositions of nitrate in precipitation (wet deposition) and groundwater (spring, lake, and stream water) were determined for the island of Rishiri, Japan, so as to use the 17O anomalies (Δ17O) to trace t...
Sources of pore water in a Tanegashima mud volcano inferred from chemical and stable isotopic studies
Nakayama, Noriko, Ashi, Juichiro, Tsunogai, Urumu, Gamo, Toshitaka, Tanahashi, Michiro
GEOCHEMICAL JOURNAL   44(6) 561-569   2010   [Refereed]
Pore waters at the depths of 0-590 cm below seafloor (bsf) were collected from four core samples at four different sites in a mud volcano off Tanegashima Island between Ryukyu trench and Ryukyu arc of Japan Concentrations of Cl(-), SO(4)(2-), CH<s...
Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough
Kawagucci, Shinsuke, Shirai, Kotaro, Lan, Tefang Faith, Takahata, Naoto, Tsunogai, Urumu, Sano, Yuji, Gamo, Toshitaka
GEOCHEMICAL JOURNAL   44(6) 507-518   2010   [Refereed]
Hydrothermal plumes above the HAKUREI and JADE sites two high-temperature hydrothermal vent sites in the Izena Cauldron at the mid-Okinawa Trough were investigated in order to gain a preliminary understanding of gas geochemical characteristics at ...
Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough
Gamo, Toshitaka, Tsunogai, Urumu, Ichibayashi, Shinsuke, Chiba, Hitoshi, Obata, Hajime, Oomori, Tamotsu, Noguchi, Takuro, Baker, Edward T., Doi, Takashi, Maruo, Masahiro, Sano, Yuji
GEOCHEMICAL JOURNAL   44(6) 477-487   2010   [Refereed]
Within neutrally buoyant hydrothermal plumes derived from the Yonaguni Knoll IV hydrothermal field (24 degrees 51' N, 122 degrees 42' E D = 1 370-1 385 m) in the southwestern Okinawa Trough back arc basin we obtained profiles of dissolved manganes...
Origin and fate of deep-sea seeping methane bubbles at Kuroshima Knoll, Ryukyu forearc region, Japan
Tsunogai, U., Kosaka, A., Nakayama, N., Komatsu, D. D., Konno, U., Kameyama, S., Nakagawa, F., Sumino, H., Nagao, K. , Fujikura, K., Machiyama, H.
GEOCHEMICAL JOURNAL   44(6) 461-476   2010   [Refereed][Invited]
Seafloor sec ping methane bubbles were successfully sampled on the summit area of the Kuroshima Knoll (depth of ca 640 m) using the gas-tight sampler WHATS attached to the Shinkai 2000 To evaluate the origin of the bubbles and verify that the diss...
Konno, U., Tsunogai, U., Komatsu, D. D., Daita, S., Nakagawa, F., Tsuda, A., Matsui, T., Eum, Y. -J., Suzuki, K.
BIOGEOSCIENCES   7(8) 2369-2377   2010   [Refereed]
Using the 15N(2) tracer method and high-sensitivity delta15N analytical systems, we determined N(2) fixation rates for ocean samples by dividing them into particulate (> 0.7 mu m) and filtrate (< 0.7 mu m) fractions. While N(...
Kato, Kenji, Nagaosa, Kazuyo, Kimura, Hiroyuki, Katsuyama, Chie , Hama, Katsuhiro, Kunimaru, Takanori, Tsunogai, Urumu, Aoki, Kazuhiro
ENVIRONMENTAL MICROBIOLOGY REPORTS   1(6) 569-574   Dec 2009   [Refereed]
P>We collected groundwater samples at depths of up to 482 m from three boreholes drilled into sedimentary rock within two formations in Hokkaido, Japan. The prokaryotic community in each subsurface groundwater sample was analysed by microscopic co...
Hirota, A., Ijiri, A., Komatsu, D. D., Ohkubo, S. B., Nakagawa, F., Tsunogai, U.
MARINE CHEMISTRY   116(40912) 47-53   Nov 2009   [Refereed]
We found N2O enrichment of up to 157% saturation in continental shelf water columns in the Bering and Chukchi Seas at water depths less than 66 m. The N2O enrichment exhibited a linear relationship with N* depletion. We also observed that the stab...
Miyazaki, Junichi, Higa, Ryosaku, Toki, Tomohiro, Ashi, Juichiro, Tsunogai, Urumu, Nunoura, Takuro, Imachi, Hiroyuki , Takai, Ken
APPLIED AND ENVIRONMENTAL MICROBIOLOGY   75(22) 7153-7162   Nov 2009   [Refereed]
The potential for microbial nitrogen fixation in the anoxic methane seep sediments in a mud volcano, the number 8 Kumano Knoll, was characterized by molecular phylogenetic analyses. A total of 111 of the nifH (a gene coding a nitrogen fixation enz...
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Tsunogai, Urumu, Ooki, Atsushi, Yokouchi, Yoko, Takeda, Shigenobu, Obata, Hajime, Uematsu, Mitsuo
ANALYTICAL CHEMISTRY   81(21) 9021-9026   Nov 2009   [Refereed]
We developed an equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) method for fast detection of dimethyl sulfide (DAIS) dissolved in seawater. Dissolved DMS extracted by bubbling pure nitrogen through the sample was continuo...
Ijiri, Akira, Tsunogai, Urumu, Gamo, Toshitaka, Nakagawa, Fumiko, Sakamoto, Tatsuhiko, Saito, Saneatsu
GEO-MARINE LETTERS   29(5) 301-308   Oct 2009   [Refereed]
Substantial amounts of adsorbed methane were detected in authigenic carbonate concretions recovered from sedimentary layers from depths between 245 and 1,108 m below seafloor during Ocean Drilling Program Leg 186 to ODP sites 1150 and 1151 on the ...
Tohjima, Yasunori, Katsumata, Keiichi, Morino, Isamu, Mukai, Hitoshi, Machida, Toshinobu, Akama, Isao, Amari, Taketo, Tsunogai, Urumu
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   114    Jul 2009   [Refereed]
Nondispersive infrared (NDIR) CO2 analyzer could produce erroneous CO2 mole fraction measurements for an air sample when CO2-in-air mixtures having different isotopic compositions than atmospheric CO2 ar...
Kameyama, Sohiko, Tsunogai, Urumu, Nakagawa, Fumiko, Sasakawa, Motoki, Komatsu, Daisuke D., Ijiri, Akira, Yamaguchi, Junko, Horiguchi, Takeo, Kawamura, Hiroshi, Yamaguchi, Aika, Tsuda, Atsushi
MARINE CHEMISTRY   115(40910) 92-101   Jun 2009   [Refereed]
During the Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study II (SEEDS-II), we monitored variations in the concentrations of non-methane hydrocarbons (NMHCs), CH(3)Cl. N(2)O. and CH4 within a phytoplankton bloom. Stable iso...
Saito, Takuya, Kawamura, Kimitaka, Tsunogai, Urumu, Chen, Tai-Yih, Matsueda, Hidekazu, Nakatsuka, Takeshi, Gamo, Toshitaka, Uematsu, Mitsuo, Huebert, Barry J.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   114    Jun 2009   [Refereed]
The first airborne measurements of stable carbon isotope ratios (delta13C) of nonmethane hydrocarbons (NMHCs) were made over east Asia and its downwind regions as part of the Asian Pacific Regional Aerosol Characterization Experiment (A...
Kimoto, Katsunori, Ishimura, Toyoho, Tsunogai, Urumu, Itaki, Takuya, Ujiie, Yurika
MARINE MICROPALEONTOLOGY   71(40910) 71-79   Apr 2009   [Refereed]
Gallitellia vivans (Cushman) is the only triserial coiling species among modern planktic foraminifera. Although previous studies suggested that G. vivans is a planktic species, it was unreported for a long time because of its small test and its lo...
Suzuki, Yohey, Suko, Takeshi, Yoshioka, Hideyoshi, Takahashi, Masaaki, Nanba, Kenji, Tsunogai, Urumu, Takeno, Naoto, Ito, Kazumasa
CHEMICAL GEOLOGY   259(40972) 107-119   Feb 2009   [Refereed]
Microorganisms thrive in the deep subsurface, but their extent and distribution, type and rate of metabolism are not well constrained, at least in part, owing to geochemical, lithological, hydrological and tectonic variations. We obtained deep sed...
Kumagai, H., Nakamura, K., Toki, T., Morishita, T., Okino, K., Ishibashi, J. -I., Tsunogai, U., Kawagucci, S., Gamo, T. , Shibuya, T., Sawaguchi, T., Neo, N., Joshima, M., Sato, T., Takai, K.
GEOFLUIDS   8(4) 239-251   Nov 2008   [Refereed]
Hydrogen-rich hydrothermal areas, such as those in the Indian Ocean, may have had an influence on early evolution of life on Earth and thus have attracted interest because they may be a proxy for ancient ecosystems. The Kairei and Edmond hydrother...
Kawagucci, Shinsuke, Okamura, Kei, Kiyota, Kaoru, Tsunogai, Urumu, Sano, Yuji, Tamaki, Kensaku, Gamo, Toshitaka
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   9    Oct 2008   [Refereed]
We have investigated newly discovered submarine hydrothermal plumes over the Central Indian Ridge, 18° - 20° S. Onshore chemical analyses of methane, its carbon isotope, manganese, and helium-3 in seawater samples obtained from the plumes revealed...
Naraoka, Hiroshi, Naito, Taku, Yamanaka, Toshiro, Tsunogai, Urumu, Fujikura, Katsunori
CHEMICAL GEOLOGY   255(40910) 25-32   Sep 2008   [Refereed]
To investigate symbiotic bacterial ecosystems at different deep-sea hydrothermal systems in the northwestern Pacific, compound-specific carbon and hydrogen isotope analyses of lipid biomarkers have been performed in addition to bulk C, H, N, S and...
Toki, Tomohiro, Tsunogai, Urumu, Ishibashi, Jun-ichiro, Utsumi, Motoo, Gamo, Toshitaka
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   113(B8)    Aug 2008   [Refereed]
The gas geochemistries of high-temperature and low-temperature hydrothermal fluids (HTHFs and LTHFs, respectively) were studied for the Suiyo Seamount hydrothermal system (140 degrees 39'E, 28 degrees 33'N) in the southern Izu-Bonin (Ogasawara) Ar...
Takai, Ken, Nakamura, Kentaro, Toki, Tomohiro, Tsunogai, Urumu , Miyazaki, Masayuki, Miyazaki, Junichi, Hirayama, Hisako, Nakagawa, Satoshi, Nunoura, Takuro, Horikoshi, Koki
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   105(31) 10949-10954   Aug 2008   [Refereed]
We have developed a technique for cultivation of chemolithoautotrophs under high hydrostatic pressures that is successfully applicable to various types of deep-sea chemolithoautotrophs, including methanogens. It is based on a glass-syringe-sealing...
Ishimura, Toyoho, Tsunogai, Urumu, Nakagawa, Fumiko
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   22(12) 1925-1932   Jun 2008   [Refereed]
We determined grain-scale heterogeneities (from 6 to 88 mu g) in the stable carbon and oxygen isotopic compositions (delta13C and delta(18)O) of the international standard calcite materials (NBS 19, NBS 18, IAEA-CO-1, and IAEA-CO-8) usi...
omatsu, D.D., T. Ishimura, F. Nakagawa, U. Tsunogai
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   22(10) 1587-1596   May 2008   [Refereed]
We developed a rapid, sensitive, and automated analytical system to determine the delta15N, delta18O, and Δ17O values of nitrous oxide (N2O) simultaneously in nanomolar quantities for a single batch of s...
Uchida, Masao, Ohkushi, Ken'ichi, Kimoto, Katsunori, Inagaki, Fumio, Ishimura, Toyoho, Tsunogai, Urumu, TuZino, Taqumi, Shibata, Yasuyuki
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   9    Apr 2008   [Refereed]
A previous study interpreted extremely 13C-depleted excursions of planktonic and benthic foraminifera in last glacial sediments (17,500 to 25,400 cal years B. P.) of the core retrieved from off Shimokita Peninsula and off Hokkaido, Japa...
Sasakawa, Motoki, Tsunogai, Urumu, Kameyama, Sohiko, Nakagawa, Fumiko, Nojiri, Yukihiro, Tsuda, Atsushi
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS   113(C3)    Mar 2008   [Refereed]
We collected samples of seawater, zooplankton, and sinking particles in the northwestern North Pacific to determine the source of excess CH4 over the saturation value in equilibrium with the atmospheric CH4 in the oxygenated ...
Tsunogai, U., T. Kido, A. Hirota, S.B. Ohkubo, D.D. Komatsu, F. Nakagawa
Rapid Communications in Mass Spectrometry   22(3) 345-354   Jan 2008   [Refereed]
We present a method for high-sensitivity nitrogen isotopic analysis of particulate organic nitrogen (PON) in seawater and freshwater, for the purpose of determining the aquatic nitrogen fixation rate through the 15N(2) tracer technique ...
Suzuki, Ryohei, Ishibashi, Jun-Ichiro, Nakaseama, Miwako, Konno, Uta, Tsunogai, Urumu, Gena, Kaul, Chiba, Hitoshi
RESOURCE GEOLOGY   58(3) 267-288   2008   [Refereed]
The Yonaguni Knoll IV hydrothermal vent field (24 degrees 51'N, 122 degrees 42'E) is located at water depths of 1370-1385 m near the western edge of the southern Okinawa Trough. During the YK03-05 and YK04-05 expeditions using the submersible Shin...
Long-term observation of mass-independent oxygen isotope anomaly in stratospheric CO2
Kawagucci, S., Tsunogai, U., Kudo, S., Nakagawa, F., Honda, H., Aoki, S., Nakazawa, T., Tsutsumi, M., Gamo, T.
ATMOSPHERIC CHEMISTRY AND PHYSICS   8(20) 6189-6197   2008   [Refereed]
Stratospheric and upper tropospheric air samples were collected during 1994-2004 over Sanriku, Japan and in 1997 over Kiruna, Sweden. Using these archived air samples, we determined the triple oxygen-isotope composition of stratospheric CO2</...
Determination of formaldehyde mixing ratios in air with PTR-MS: laboratory experiments and field measurements
Inomata, S., Tanimoto, H., Kameyama, S., Tsunogai, U., Irie, H., Kanaya, Y., Wang, Z.
ATMOSPHERIC CHEMISTRY AND PHYSICS   8(2) 273-284   2008   [Refereed]
Formaldehyde (HCHO), the most abundant carbonyl compound in the atmosphere, is generated as an intermediate product in the oxidation of nonmethane hydrocarbons. Proton transfer reaction mass spectrometry (PTR-MS) has the capability to detect HCHO ...
Toki, T., Tsunogai, U., Gamo, T., Tanahashi, M.
JOURNAL OF GEOCHEMICAL EXPLORATION   95(40911) 29-39   Oct 2007   [Refereed]
We collected sediment samples and pore water samples from the surface sediment on the Daini Atsumi Knoll, and analyzed the sediments for CH4, C2H6, and delta C-13(CH4), and the pore fluids for CH4, C2H6, delta C-13...
Kim, Yongwon, Ueyama, Masahito, Nakagawa, Fumiko, Tsunogai, Urumu, Harazono, Yoshinobu, Tanaka, Noriyuki
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY   59(2) 223-233   Apr 2007   [Refereed]
This research was carried out to estimate the winter fluxes of CO2 and CH4 using the concentration profile method and the chamber method in black spruce forest soils in central Alaska during the winter of 2004/5. The average ...
Kim, Ji-Hoon, Park, Myong-Ho, Tsunogai, Urumu, Cheong, Tae-Jin , Ryu, Byong-Jae, Lee, Young-Joo, Han, Hyun-Chul, Oh, Jae-Ho , Chang, Ho-Wan
ISLAND ARC   16(1) 93-104   Mar 2007   [Refereed]
Geochemical analyses of sediments, pore water and headspace gas of the piston cores taken from the eastern part of Ulleung Basin of the East Sea (Japan Sea) were carried out to assess the origin of the sedimentary organic matter and interstitial f...
Chemical and isotopic characteristics of interstitial fluids within the Taiwan Chelungpu fault
Hirono, Tetsuro, Tsunogai, Urumu, Maegawa, Kenji, Toki, Tomohiro, Tanimizu, Masaharu, Soh, Wonn, Lin, Weiren, Yeh, En-Chao, Song, Sheng-Rong, Wang, Chien-Ying
GEOCHEMICAL JOURNAL   41(2) 97-102   2007   [Refereed]
We determined chloride and sulfate concentrations and (delta D-H2O and delta O-18(H2O) isotope ratios of interstitial fluids extracted from cores from two fault zones within the Taiwan Chelungpu fault. The fluids had higher concentrations of chlor...
Rare earth elements in the hydrothermal system at Okinawa Trough back-arc basin
Hongo, Yayoi, Obata, Hajime, Gamo, Toshitaka, Nakaseama, Miwako , Ishibashi, Junichiro, Konno, Uta, Saegusa, Shunsuke, Ohkubo, Satoru, Tsunogai, Urumu
GEOCHEMICAL JOURNAL   41(1) 40923   2007   [Refereed]
We present novel data sets of rare earth element (REE) distributions in a hydrothermal vent field at Yonaguni Knoll IV in the Okinawa Trough. Vertical REE profiles in three water columns showed horizontal variation of REE concentrations within 100...

Misc

 
Nakagawa Fumiko, Tsunogai Urumu, Obata Yusuke, Ando Kenta, Yamashita Naoyuki, Saito Tatsuyoshi, Uchiyama Shigeki, Morohashi Masayuki, Sase Hiroyuki
BIOGEOSCIENCES   15(22) 7025-7042   Nov 2018
Onishi Yuji, Shimamura Sho, Yamanaka Toshiro, Nakayama Rei, Ozaki Ken-Ichi, Miyazaki Masayuki, Tsunogai Urumu, Fujiwara Yoshihiro
MARINE BIOLOGY   165(9)    Sep 2018
Oanh Thi Ngoc Bui, Kameyama Sohiko, Yoshikawa-Inoue Hisayuki, Ishii Masao, Sasano Daisuke, Uchida Hiroshi, Tsunogai Urumu
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY   70    Aug 2018
Ijiri Akira, Inagaki Fumio, Kubo Yusuke, Adhikari Rishi R., Hattori Shohei, Hoshino Tatsuhiko, Imachi Hiroyuki, Kawagucci Shinsuke, Morono Yuki, Ohtomo Yoko, Ono Shuhei, Sakai Sanae, Takai Ken, Toki Tomohiro, Wang David T., Yoshinaga Marcos Y., Arnold Gail L., Ashi Juichiro, Case David H., Feseker Tomas, Hinrichs Kai-Uwe, Ikegawa Yojiro, Ikehara Minoru, Kallmeyer Jens, Kumagai Hidenori, Lever Mark A., Morita Sumito, Nakamura Ko-ichi, Nakamura Yuki, Nishizawa Manabu, Orphan Victoria J., Roy Hans, Schmidt Frauke, Tani Atsushi, Tanikawa Wataru, Terada Takeshi, Tomaru Hitoshi, Tsuji Takeshi, Tsunogai Urumu, Yamaguchi Yasuhiko T., Yoshida Naohiro
SCIENCE ADVANCES   4(6)    Jun 2018
Ijiri Akira, Iijima Koichi, Tsunogai Urumu, Ashi Juichiro, Inagaki Fumio
GEOSCIENCES   8(6)    Jun 2018
Nelson David M., Tsunogai Urumu, Ding Dong, Ohyama Takuya, Komatsu Daisuke D., Nakagawa Fumiko, Noguchi Izumi, Yamaguchi Takashi
ATMOSPHERIC CHEMISTRY AND PHYSICS   18(9) 6381-6392   May 2018
Tsunogai Urumu, Miyauchi Takanori, Ohyama Takuya, Komatsu Daisuke D., Ito Masanori, Nakagawa Fumiko
LIMNOLOGY AND OCEANOGRAPHY   63 S458-S476   Mar 2018
Ino Kohei, Hernsdorf Alex W., Konno Uta, Kouduka Mariko, Yanagawa Katsunori, Kato Shingo, Sunamura Michinari, Hirota Akinari, Togo Yoko S., Ito Kazumasa, Fukuda Akari, Iwatsuki Teruki, Mizuno Takashi, Komatsu Daisuke D., Tsunogai Urumu, Ishimura Toyoho, Amano Yuki, Thomas Brian C., Banfield Jillian F., Suzuki Yohey
ISME JOURNAL   12(1) 31-47   Jan 2018
Lee Jun-Ho, Woo Han Jun, Son Seung-Kyu, Kim Moonkoo, Lee Dong-Hun, Tsunogai Urumu, Jeong Kap-Sik
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING   53(5) 457-466   2018
Suzuki, Y., K. Ino, A. Hernsdorf, U. Konno, M. Kouduka, K. Yanagawa, M. Sunamura, A. Hirota, Y. Togo, K. Ito, A. Fukuda, T. Iwatsuki, T. Mizuno, D. Komatsu, U. Tsunogai, T. Ishimura, Y. Amano, B. Thomas, J. Banfield, and S. Kato
The ISME Journal      Sep 2017   [Refereed]
Toki Tomohiro, Iwata Daigo, Tsunogai Urumu, Komatsu Daisuke D., Sano Yuji, Takahata Naoto, Hamasaki Hiroshi, Ishibashi Jun-ichiro
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   330 24-35   Jan 2017
Miyakawa Kazuya, Ishii Eiichi, Hirota Akinari, Komatsu Daisuke D., Ikeya Kosuke, Tsunogai Urumu
APPLIED GEOCHEMISTRY   76 218-231   Jan 2017
Toki, T., A. Hamamoto, M. Tawata, J. Miyazaki, K. Nakamura, M. Abe, K. Takai, Y. Sano, N. Takahata, U. Tsunogai, J. Ishibashi
Chemical Geology   447 208-218   Dec 2016   [Refereed]
Toki, T., M. Itoh, D. Iwata, S. Ohshima, R. Shinjo, J. Ishibashi, U. Tsunogai, N. Takahata, Y. Sano, T. Yamanaka, A. Ijiri, N. Okabe, T. Gamo, Y. Muramatsu, Y. Ueno, S. Kawagucci, and K. Takai
Geochemical Journal   50(6) 493-525   Dec 2016   [Refereed]
Nobuhara, T., D. Onda, T. Sato, H. Aosawa, T. Ishimura, A. Ijiri, U. Tsunogai, N. Kikuchi, Y. Kondo, and S. Kiel
Paläontologische Zeitschrift   90(4) 701–722   Dec 2016   [Refereed]
Tsunogai, U., L. Cheng, M. Ito, D. D. Komatsu, F. Nakagawa, and H. Shinoara
Geophysical Research Letters   43(22) 11620-11627   Nov 2016   [Refereed]
Sadekov, A., K. Darling, T. Ishimura, C. Wade, K. Kimoto, A. Singh, P. Anand, D. Kroon, S. Jung, G. Ganssen, R. Ganneshram, U. Tsunogai, and H. Elderfield
Paleoceanography   31(10) 1440-1452   Oct 2016   [Refereed]
Kagoshima, T., Y. Sano, N. Takahata, A. Ishida, Y. Tomonaga, E. Roulleau, D. L. Pinti, T. P. Fischer, T. Lan, Y. Nishio and U. Tsunogai
Journal of Volcanology and Geothermal Research   325 179-188   Oct 2016   [Refereed]
Wen, H.-Y., Y. Sano, N. Takahata, Y. Tomonaga, A. Ishida, K. Tanaka, T. Kagoshima, K. Shirai, J. Ishibashi, H. Yokose, U. Tsunogai, and T.F. Yang
Scientific Reports   6 doi:10.1038/srep34126   Sep 2016   [Refereed]
Yamazaki, A., T. Watanabe, U. Tsunogai, F. Iwase, H. Yamano
Paleoceanography   31(6) 838-846   Jun 2016   [Refereed]
Tsunogai, U., T. Miyauchi, T. Ohyama, D.D. Komatsu, F. Nakagawa, Y. Obata, K. Sato, and T. Ohizumi
Biogeosciences   13 3441-3459   Jun 2016   [Refereed]
Ino, K., U. Konno, M. Kouduka, A. Hirota, Y. Togo, A. Fukuda, D. Komatsu, U. Tsunogai, A.S. Tanabe, S. Yamamoto, T. Iwatsuki, T. Mizuno, K. Ito, Y. Suzuki
Environmental Microbiology Reports   8(2) 285-294   Apr 2016   [Refereed]
Tsunogai, Urumu, and Fumiko Nakagawa
Earozoru Kenkyu   31(1) 5-14   Mar 2016   [Refereed][Invited]
In this paper, recent advances in using stable isotopes of atmospheric nitrate to trace the origin and fate are reviewed. While nitrogen isotopes have been used as the indicators of NOx source contributions to the atmospheric nitrate, cautions mus...
The GEOTRACES Group
Marine Chemistry   177(1) 1-8   Dec 2015   [Refereed]
Gamo, T., K. Okamura, H. Hatanaka, H. Hasumoto, D. Komatsu, M. Chinen, M. Mori, J. Tanaka, A. Hirota, U. Tsunogai, K. Tamaki
Deep-Sea Research Part II   121 62-70   Nov 2015   [Refereed]
Ishibashi, J. U. Tsunogai, T. Toki, N. Ebina, T. Gamo, Y. Sano, H. Masuda, H. Chiba
Deep-Sea Research Part II   121 126-136   Nov 2015   [Refereed]
Yamazaki, A., T. Watanabe, U. Tsunogai, H. Hasegawa, H. Yamano
Coral Reefs   34(1) 353-362   Mar 2015   [Refereed]
Suzuki, Y., U. Konno, A. Fukuda, D.D. Komatsu, A. Hirota, Y. Togo, N. Morikawa, H. Hagiwara, D. Aosai, T. Iwatsuki, U. Tsunogai, S. Nagao, K. Ito, T. Mizuno
PLoS ONE   9(12) e113063   Dec 2014   [Refereed]
Toki, Tomohiro, Jun-ichiro Ishibashi, Takuroh Noguchi, Miki Tawata, Urumu Tsunogai, Toshiro Yamanaka, Kentaro Nakamura
Subseafloor Biosphere Linked to Hydrothermal Systems   587-602   Nov 2014   [Refereed][Invited]
Yamanaka, T., H. Nagashio, R. Nishio, K. Kondo, T. Noguchi, K. Okamura, T. Nunoura, H. Makita, K. Nakamura, H. Watanabe, K. Inoue, T. Toki, K. Iguchi, U. Tsunogai, R. Nakada, S. Ohshima, S. Toyoda, J. Kawai, N. Yoshida, A. Ijiri, and M. Sunamura
Subseafloor Biosphere Linked to Hydrothermal Systems   497-504   Nov 2014   [Refereed]
Toki, T., R. Higa, A. Ijiri, U. Tsunogai and J. Ashi
Earth Planets and Space   66 doi:10.1186/s40623-014-0137-3   Oct 2014   [Refereed]
Tsunogai, U., Komatsu, D. D., Ohyama, T., Suzuki, A., Nakagawa, F., Noguchi, I., Takagi, K., Nomura, M., Fukuzawa, K., Shibata, H.
Biogeosciences   11(19) 5411–5424   Oct 2014   [Refereed]
Isotopes in Environmental Sciences: 3, Appling stable isotopes for studying behavior of trace components
Tsunogai, U., F. Nakagawa
Journal of Japan Society for Atmospheric Environment   49(5) A63-A72   Sep 2014   [Refereed][Invited]
Notsu, K., R. Sohrin, H. Wada, T. Tsuboi, H. Sumino, T. Mori, U. Tsunogai, P.A. Hernandez, Y. Suzuki, R. Ikuta, K. Oorui, M. Koyama, T. Masuda, N. Fujii
Journal of Volcanology and Geothermal Research   270 90-98   Jan 2014   [Refereed]
Origin of pore water in Kumano mud volcanoes
Toki, T., R. Higa, A. Tanahara, A. Ijiri, U. Tsunogai, J. Ashi
Chikyukagaku (Geochemistry)   47(4) 221-236   Dec 2013   [Refereed]
Katsuyama, C., Nashimoto, H., Nagaosa, K., Ishibashi, T., Kinoshita, T., Yoshikawa, H., Aoki, K., Asano, T., Sasaki, Y., Sohrin, R., Komatsu, D., Tsunogai, U., Kimura, H., Suwa, Y., Kato, K.
FEMS Microbiology Ecology   86(3) 532–543   Dec 2013   [Refereed]
Remote temperature sensing on volcanic fumaroles using HIReTS: Applications to Satsuma-Iwojima volcano, Japan
Tsunogai, U., D.D. Komatsu, F. Nakagawa
Bulltein of the Volcanological Society of Japan   58(3) 443-459   Sep 2013   [Refereed]
Kameyama, S., H. Tanimoto, S. Inomata, H. Y. Inoue, U. Tsunogai, A. Tsuda, M. Uematsu, M. Ishii, D. Sasano
Geophysical Research Letters   40(15) 3986-3990   Aug 2013   [Refereed]
Although much attention has been paid to describing the distribution of oceanic dimethyl sulfide (DMS) concentrations, establishing robust relationships between DMS concentrations and biological, physical, and chemical variables is still challengi...
Yamazaki, A., T. Watanabe, N. Takahata, Y. Sano, U. Tsunogai
Chemical Geology   351 276–280   Aug 2013   [Refereed]
Nakagawa, F., A. Suzuki, S. Daita, T. Ohyama, D.D. Komatsu, U. Tsunogai
Biogeosciences   10 3547-3558   Jun 2013   [Refereed]
Kitagawa, T., T. Ishimura, R. Uozato, K. Shirai, Y. Amano, A. Shinoda, T. Otake, U. Tsunogai, S. Kimura
Marine Ecology Progress Series      May 2013   [Refereed]
Konno, U., M. Kouduka, D.D. Komatsu, K. Ishii, A. Fukuda, U. Tsunogai, K. Ito, Y. Suzuki
Microbial Ecology   65(3) 626-637   Apr 2013   [Refereed]
von Glasow, R., T. Jickells, A. Baklanov, G.R. Carmichael, T. Church, L. Gallardo, C. Hughes, M. Kanakidou, P. Liss, L. Mee, R. Raine, P. Ramachandran, R. Ramesh, K. Sundseth, U. Tsunogai, M. Uematsu, T. Zhu
AMBIO   42(1) 13-28   Feb 2013   [Refereed]
Contribution of methane to total gas pressure in deep waters at lakes Nyos and Monoun (Cameroon, West Africa)
Issa, T. Ohba, F. Wilson, Y. Yoshida, F. Alain, M. Kusakabe, U. Tsunogai, Y. Oginuma, C. T. Boris, G. Tanyileke, S. Nkamdjou, H. Satake J.V. Hell
Geochemical Journal   47(3) 349-362   2013   [Refereed]
Tsunogai, U., K. Maegawa, S. Sato, D.D. Komatsu, F. Nakagawa, T. Toki, and J. Ashi
Earth and Planetary Science Letters   341-344 79-85   Aug 2012   [Refereed]
We report here the discovery of two methane-enriched plumes in a water column above the Kumano Knoll 5 submarine mud volcano (KK-5) in Nankai Trough during 2004; a slight methane enrichment was observed in this region in 2000 and 2010. The deeper ...
Ijiri, A., N. Harada, A. Hirota, U. Tsunogai, N.O. Ogawa, T. Itaki, B.-K. Khim, M. Uchida
Organic Geochemistry   48 47-55   Jul 2012   [Refereed]
Kato, S., K. Nakamura, T. Toki, J. Ishibashi, U. Tsunogai, A. Hirota, M. Ohkuma, A. Yamagishi
Frontiers in Microbiology   3    Mar 2012   [Refereed]
Kawagucci, S., Y.T. Yoshida, T. Noguchi, M.C. Honda, H. Uchida, H. Ishibashi, F. Nakagawa, U. Tsunogai, K. Okamura, Y. Takaki, T. Nunoura, J. Miyazaki, W. Lin, H. Kitazato, and K. Takai
Scientific Reports   2    Feb 2012   [Refereed]
The impacts of the M9.0 Tohoku Earthquake on deep-sea environment were investigated 36 and 98 days after the event. The light transmission anomaly in the deep-sea water after 36 days became atypically greater (similar to 35 %) and more extensive (...
Gamo, T., U. Tsunogai, A. Hirota, N. Nakayama, D.-J. Kang, K.-R. Kim
MARINE CHEMISTRY   128 92-99   Jan 2012   [Refereed]
We measured dissolved methane (CH4) and its carbon isotope ratio (C-13/C-12 or delta C-13) from surface to bottom seawaters (maximum depth: 3574 m) for the first time in three major offshore areas of the Japan Sea (East Sea): the easter...
The origin of methane in crustal fluids around the Ryukyu Islands
Tomohiro Toki, Ryutaro Honda, Kazuki Oomine, Daigo Iwata, Urumu Tsunogai, Daisuke D. Komatsu, Yuji Sano, Naoto Takahata, Jun-ichiro Ishibashi, Masataka Kinoshita, Hideyuki Yamashiro
Chikyukagaku (Geochemistry)   46(4) 257-274   2012   [Refereed]
Ishimura, T., Tsunogai, U., Hasegawa, S., Nakagawa, F., Oi, T., Kitazato, H., Suga, H., Toyofuku, T.
Biogeosciences   9 4353-4367   2012   [Refereed]
Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316
Geochemical Journal   46(2) 89-106   2012   [Refereed]
Komatsu, Daisuke D., Tsunogai, Urumu, Kamimura, Kanae, Konno, Uta, Ishimura, Toyoho, Nakagawa, Fumiko
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   25(21) 3351-3359   Nov 2011   [Refereed]
We have developed a new automated analytical system that employs a continuous flow isotope ratio mass spectrometer to determine the stable hydrogen isotopic composition (delta D) of nanomolar quantities of molecular hydrogen (H2) in an ...
Yamazaki, Atsuko, Watanabe, Tsuyoshi, Tsunogai, Urumu
GEOPHYSICAL RESEARCH LETTERS   38    Oct 2011   [Refereed]
Understanding tropical nutrient dynamics is essential for quantifying marine productivity. In tropical and subtropical oceans, however, the spatial and continuous observation of nutrients has been scarce because of low nutrient concentration. The ...
Tsunogai, U., K. Kamimura, S. Anzai, F. Nakagawa, D.D. Komatsu
GEOCHIMICA ET COSMOCHIMICA ACTA   75(16) 4531-4546   Aug 2011   [Refereed]
In high-temperature volcanic fumaroles (>400 degrees C), the isotopic composition of molecular hydrogen (H2) reaches equilibrium with that of the fumarolic H2O. In this study, we used this hydrogen isotope exchange equilibriu...
Nakada, Ryoichi, Takahashi, Yoshio, Tsunogai, Urumu, Zheng, Guodong, Shimizu, Hiroshi, Hattori, Keiko H.
APPLIED GEOCHEMISTRY   26(7) 1065-1076   Jul 2011   [Refereed]
A comprehensive study was performed to characterize, for the first time, the mud, water, and gases released from onshore mud volcanoes located in the southern margin of the Junggar Basin, northwestern China. Chemical compositions of mud, along wit...
Gay, A., Takano, Y., Gilhooly, III, W. P., Berndt, C., Heeschen, K., Suzuki, N., Saegusa, S., Nakagawa, F., Tsunogai, U., Jiang, S. Y., Lopez, M.
GEOFLUIDS   11(1) 34-47   Feb 2011   [Refereed]
We analyse the fluid flow regime within sediments on the Eastern levee of the modern Mississippi Canyon using 3D seismic data and downhole logging data acquired at Sites U1322 and U1324 during the 2005 Integrated Ocean Drilling Program (IODP) Expe...
Saito, Takuya, Stein, Olaf, Tsunogai, Urumu, Kawamura, Kimitaka , Nakatsuka, Takeshi, Gamo, Toshitaka, Yoshida, Naohiro
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   116    Jan 2011   [Refereed]
The atmospheric mixing ratios of ethane and its stable carbon isotope ratios (delta13C) were measured over the North Pacific (2 degrees N to 38 degrees N, 140 degrees E to 90 degrees W) during oceanographic cruises in summer and autumn....
Application of PTR-MS to an incubation experiment of the marine diatom Thalassiosira pseudonana
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Suzuki, Koji, Komatsu, Daisuke D., Hirota, Akinari, Konno, Uta, Tsunogai, Urumu
GEOCHEMICAL JOURNAL   45(5) 355-363   2011   [Refereed]
Emission of trace gases from the marine diatom Thalassiosira pseudonana (CCMP 1335) was continuously monitored with a proton transfer reaction-mass spectrometry (PTR-MS) in an axenic batch culture system under a 13:11-h light:dark cycle. Substanti...
Tsunogai, U., Daita, S., Komatsu, D. D., Nakagawa, F., Tanaka, A.
BIOGEOSCIENCES   8(3) 687-702   2011   [Refereed]
The stable isotopic compositions of nitrate, including the 17O anomalies (Delta17O), were determined twice in 1 yr (June and August 2007) in the oligotrophic water column of Lake Mashu, Japan. These data were then used to qua...
Watsuji, Tomo-o, Nakagawa, Satoshi, Tsuchida, Shinji, Toki, Tomohiro, Hirota, Akinari, Tsunogai, Urumu, Takai, Ken
MICROBES AND ENVIRONMENTS   25(4) 288-294   Dec 2010   [Refereed]
The galatheid crab, Shinkaia crosnieri (Decapoda: Galatheidae), forms dense colonies in the Iheya North and Hatoma Knoll deep-sea hydrothermal fields and has numerous setae covered with filamentous epibiotic microorganisms. Molecular phylogenetic ...
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Tsunogai, Urumu, Ooki, Atsushi, Takeda, Shigenobu, Obata, Hajime, Tsuda, Atsushi, Uematsu, Mitsuo
MARINE CHEMISTRY   122(40912) 59-73   Oct 2010   [Refereed]
We developed an equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) system for high-resolution measurement of the concentrations of multiple volatile organic compounds (VOCs) dissolved in seawater. The equilibration of five V...
Fukuda, Akari, Hagiwara, Hiroki, Ishimura, Toyoho, Kouduka, Mariko, Ioka, Seiichiro, Amano, Yuki, Tsunogai, Urumu, Suzuki, Yohey, Mizuno, Takashi
MICROBIAL ECOLOGY   60(1) 214-225   Jul 2010   [Refereed]
Although deep subterranean crystalline rocks are known to harbor microbial ecosystems, geochemical factors that constrain the biomass, diversity, and metabolic activities of microorganisms remain to be clearly defined. To better understand the geo...
Hirota, A., Tsunogai, U., Komatsu, D. D., Nakagawa, F.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   24(7) 1085-1092   Apr 2010   [Refereed]
We have developed a rapid, sensitive, and automated analytical system to simultaneously determine the concentrations and stable isotopic compositions (delta15N, delta(18)O, and delta13C) of nanomolar quantities of nitrous oxi...
Nunoura, Takuro, Oida, Hanako, Nakaseama, Miwako, Kosaka, Ayako , Ohkubo, Satoru B., Kikuchi, Toru, Kazama, Hiromi, Hosoi-Tanabe, Shoko, Nakamura, Ko-ichi, Kinoshita, Masataka, Hirayama, Hisako, Inagaki, Fumio, Tsunogai, Urumu, Ishibashi, Jun-ichiro, Takai, Ken
APPLIED AND ENVIRONMENTAL MICROBIOLOGY   76(4) 1198-1211   Feb 2010   [Refereed]
A variety of archaeal lineages have been identified using culture-independent molecular phylogenetic surveys of microbial habitats occurring in deep-sea hydrothermal environments such as chimney structures, sediments, vent emissions, and chemosynt...
Tsunogai, U., Komatsu, D. D., Daita, S., Kazemi, G. A., Nakagawa, F., Noguchi, I., Zhang, J.
ATMOSPHERIC CHEMISTRY AND PHYSICS   10(4) 1809-1820   2010   [Refereed]
The stable isotopic compositions of nitrate in precipitation (wet deposition) and groundwater (spring, lake, and stream water) were determined for the island of Rishiri, Japan, so as to use the 17O anomalies (Δ17O) to trace t...
Sources of pore water in a Tanegashima mud volcano inferred from chemical and stable isotopic studies
Nakayama, Noriko, Ashi, Juichiro, Tsunogai, Urumu, Gamo, Toshitaka, Tanahashi, Michiro
GEOCHEMICAL JOURNAL   44(6) 561-569   2010   [Refereed]
Pore waters at the depths of 0-590 cm below seafloor (bsf) were collected from four core samples at four different sites in a mud volcano off Tanegashima Island between Ryukyu trench and Ryukyu arc of Japan Concentrations of Cl(-), SO(4)(2-), CH<s...
Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough
Kawagucci, Shinsuke, Shirai, Kotaro, Lan, Tefang Faith, Takahata, Naoto, Tsunogai, Urumu, Sano, Yuji, Gamo, Toshitaka
GEOCHEMICAL JOURNAL   44(6) 507-518   2010   [Refereed]
Hydrothermal plumes above the HAKUREI and JADE sites two high-temperature hydrothermal vent sites in the Izena Cauldron at the mid-Okinawa Trough were investigated in order to gain a preliminary understanding of gas geochemical characteristics at ...
Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough
Gamo, Toshitaka, Tsunogai, Urumu, Ichibayashi, Shinsuke, Chiba, Hitoshi, Obata, Hajime, Oomori, Tamotsu, Noguchi, Takuro, Baker, Edward T., Doi, Takashi, Maruo, Masahiro, Sano, Yuji
GEOCHEMICAL JOURNAL   44(6) 477-487   2010   [Refereed]
Within neutrally buoyant hydrothermal plumes derived from the Yonaguni Knoll IV hydrothermal field (24 degrees 51' N, 122 degrees 42' E D = 1 370-1 385 m) in the southwestern Okinawa Trough back arc basin we obtained profiles of dissolved manganes...
Origin and fate of deep-sea seeping methane bubbles at Kuroshima Knoll, Ryukyu forearc region, Japan
Tsunogai, U., Kosaka, A., Nakayama, N., Komatsu, D. D., Konno, U., Kameyama, S., Nakagawa, F., Sumino, H., Nagao, K. , Fujikura, K., Machiyama, H.
GEOCHEMICAL JOURNAL   44(6) 461-476   2010   [Refereed][Invited]
Seafloor sec ping methane bubbles were successfully sampled on the summit area of the Kuroshima Knoll (depth of ca 640 m) using the gas-tight sampler WHATS attached to the Shinkai 2000 To evaluate the origin of the bubbles and verify that the diss...
Konno, U., Tsunogai, U., Komatsu, D. D., Daita, S., Nakagawa, F., Tsuda, A., Matsui, T., Eum, Y. -J., Suzuki, K.
BIOGEOSCIENCES   7(8) 2369-2377   2010   [Refereed]
Using the 15N(2) tracer method and high-sensitivity delta15N analytical systems, we determined N(2) fixation rates for ocean samples by dividing them into particulate (> 0.7 mu m) and filtrate (< 0.7 mu m) fractions. While N(...
Kato, Kenji, Nagaosa, Kazuyo, Kimura, Hiroyuki, Katsuyama, Chie , Hama, Katsuhiro, Kunimaru, Takanori, Tsunogai, Urumu, Aoki, Kazuhiro
ENVIRONMENTAL MICROBIOLOGY REPORTS   1(6) 569-574   Dec 2009   [Refereed]
P>We collected groundwater samples at depths of up to 482 m from three boreholes drilled into sedimentary rock within two formations in Hokkaido, Japan. The prokaryotic community in each subsurface groundwater sample was analysed by microscopic co...
Hirota, A., Ijiri, A., Komatsu, D. D., Ohkubo, S. B., Nakagawa, F., Tsunogai, U.
MARINE CHEMISTRY   116(40912) 47-53   Nov 2009   [Refereed]
We found N2O enrichment of up to 157% saturation in continental shelf water columns in the Bering and Chukchi Seas at water depths less than 66 m. The N2O enrichment exhibited a linear relationship with N* depletion. We also observed that the stab...
Miyazaki, Junichi, Higa, Ryosaku, Toki, Tomohiro, Ashi, Juichiro, Tsunogai, Urumu, Nunoura, Takuro, Imachi, Hiroyuki , Takai, Ken
APPLIED AND ENVIRONMENTAL MICROBIOLOGY   75(22) 7153-7162   Nov 2009   [Refereed]
The potential for microbial nitrogen fixation in the anoxic methane seep sediments in a mud volcano, the number 8 Kumano Knoll, was characterized by molecular phylogenetic analyses. A total of 111 of the nifH (a gene coding a nitrogen fixation enz...
Kameyama, Sohiko, Tanimoto, Hiroshi, Inomata, Satoshi, Tsunogai, Urumu, Ooki, Atsushi, Yokouchi, Yoko, Takeda, Shigenobu, Obata, Hajime, Uematsu, Mitsuo
ANALYTICAL CHEMISTRY   81(21) 9021-9026   Nov 2009   [Refereed]
We developed an equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) method for fast detection of dimethyl sulfide (DAIS) dissolved in seawater. Dissolved DMS extracted by bubbling pure nitrogen through the sample was continuo...
Ijiri, Akira, Tsunogai, Urumu, Gamo, Toshitaka, Nakagawa, Fumiko, Sakamoto, Tatsuhiko, Saito, Saneatsu
GEO-MARINE LETTERS   29(5) 301-308   Oct 2009   [Refereed]
Substantial amounts of adsorbed methane were detected in authigenic carbonate concretions recovered from sedimentary layers from depths between 245 and 1,108 m below seafloor during Ocean Drilling Program Leg 186 to ODP sites 1150 and 1151 on the ...
Tohjima, Yasunori, Katsumata, Keiichi, Morino, Isamu, Mukai, Hitoshi, Machida, Toshinobu, Akama, Isao, Amari, Taketo, Tsunogai, Urumu
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   114    Jul 2009   [Refereed]
Nondispersive infrared (NDIR) CO2 analyzer could produce erroneous CO2 mole fraction measurements for an air sample when CO2-in-air mixtures having different isotopic compositions than atmospheric CO2 ar...
Kameyama, Sohiko, Tsunogai, Urumu, Nakagawa, Fumiko, Sasakawa, Motoki, Komatsu, Daisuke D., Ijiri, Akira, Yamaguchi, Junko, Horiguchi, Takeo, Kawamura, Hiroshi, Yamaguchi, Aika, Tsuda, Atsushi
MARINE CHEMISTRY   115(40910) 92-101   Jun 2009   [Refereed]
During the Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study II (SEEDS-II), we monitored variations in the concentrations of non-methane hydrocarbons (NMHCs), CH(3)Cl. N(2)O. and CH4 within a phytoplankton bloom. Stable iso...
Saito, Takuya, Kawamura, Kimitaka, Tsunogai, Urumu, Chen, Tai-Yih, Matsueda, Hidekazu, Nakatsuka, Takeshi, Gamo, Toshitaka, Uematsu, Mitsuo, Huebert, Barry J.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   114    Jun 2009   [Refereed]
The first airborne measurements of stable carbon isotope ratios (delta13C) of nonmethane hydrocarbons (NMHCs) were made over east Asia and its downwind regions as part of the Asian Pacific Regional Aerosol Characterization Experiment (A...
Kimoto, Katsunori, Ishimura, Toyoho, Tsunogai, Urumu, Itaki, Takuya, Ujiie, Yurika
MARINE MICROPALEONTOLOGY   71(40910) 71-79   Apr 2009   [Refereed]
Gallitellia vivans (Cushman) is the only triserial coiling species among modern planktic foraminifera. Although previous studies suggested that G. vivans is a planktic species, it was unreported for a long time because of its small test and its lo...
Suzuki, Yohey, Suko, Takeshi, Yoshioka, Hideyoshi, Takahashi, Masaaki, Nanba, Kenji, Tsunogai, Urumu, Takeno, Naoto, Ito, Kazumasa
CHEMICAL GEOLOGY   259(40972) 107-119   Feb 2009   [Refereed]
Microorganisms thrive in the deep subsurface, but their extent and distribution, type and rate of metabolism are not well constrained, at least in part, owing to geochemical, lithological, hydrological and tectonic variations. We obtained deep sed...
Kumagai, H., Nakamura, K., Toki, T., Morishita, T., Okino, K., Ishibashi, J. -I., Tsunogai, U., Kawagucci, S., Gamo, T. , Shibuya, T., Sawaguchi, T., Neo, N., Joshima, M., Sato, T., Takai, K.
GEOFLUIDS   8(4) 239-251   Nov 2008   [Refereed]
Hydrogen-rich hydrothermal areas, such as those in the Indian Ocean, may have had an influence on early evolution of life on Earth and thus have attracted interest because they may be a proxy for ancient ecosystems. The Kairei and Edmond hydrother...
Kawagucci, Shinsuke, Okamura, Kei, Kiyota, Kaoru, Tsunogai, Urumu, Sano, Yuji, Tamaki, Kensaku, Gamo, Toshitaka
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   9    Oct 2008   [Refereed]
We have investigated newly discovered submarine hydrothermal plumes over the Central Indian Ridge, 18° - 20° S. Onshore chemical analyses of methane, its carbon isotope, manganese, and helium-3 in seawater samples obtained from the plumes revealed...
Naraoka, Hiroshi, Naito, Taku, Yamanaka, Toshiro, Tsunogai, Urumu, Fujikura, Katsunori
CHEMICAL GEOLOGY   255(40910) 25-32   Sep 2008   [Refereed]
To investigate symbiotic bacterial ecosystems at different deep-sea hydrothermal systems in the northwestern Pacific, compound-specific carbon and hydrogen isotope analyses of lipid biomarkers have been performed in addition to bulk C, H, N, S and...
Toki, Tomohiro, Tsunogai, Urumu, Ishibashi, Jun-ichiro, Utsumi, Motoo, Gamo, Toshitaka
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   113(B8)    Aug 2008   [Refereed]
The gas geochemistries of high-temperature and low-temperature hydrothermal fluids (HTHFs and LTHFs, respectively) were studied for the Suiyo Seamount hydrothermal system (140 degrees 39'E, 28 degrees 33'N) in the southern Izu-Bonin (Ogasawara) Ar...
Takai, Ken, Nakamura, Kentaro, Toki, Tomohiro, Tsunogai, Urumu , Miyazaki, Masayuki, Miyazaki, Junichi, Hirayama, Hisako, Nakagawa, Satoshi, Nunoura, Takuro, Horikoshi, Koki
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   105(31) 10949-10954   Aug 2008   [Refereed]
We have developed a technique for cultivation of chemolithoautotrophs under high hydrostatic pressures that is successfully applicable to various types of deep-sea chemolithoautotrophs, including methanogens. It is based on a glass-syringe-sealing...
Ishimura, Toyoho, Tsunogai, Urumu, Nakagawa, Fumiko
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   22(12) 1925-1932   Jun 2008   [Refereed]
We determined grain-scale heterogeneities (from 6 to 88 mu g) in the stable carbon and oxygen isotopic compositions (delta13C and delta(18)O) of the international standard calcite materials (NBS 19, NBS 18, IAEA-CO-1, and IAEA-CO-8) usi...
omatsu, D.D., T. Ishimura, F. Nakagawa, U. Tsunogai
RAPID COMMUNICATIONS IN MASS SPECTROMETRY   22(10) 1587-1596   May 2008   [Refereed]
We developed a rapid, sensitive, and automated analytical system to determine the delta15N, delta18O, and Δ17O values of nitrous oxide (N2O) simultaneously in nanomolar quantities for a single batch of s...
Uchida, Masao, Ohkushi, Ken'ichi, Kimoto, Katsunori, Inagaki, Fumio, Ishimura, Toyoho, Tsunogai, Urumu, TuZino, Taqumi, Shibata, Yasuyuki
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   9    Apr 2008   [Refereed]
A previous study interpreted extremely 13C-depleted excursions of planktonic and benthic foraminifera in last glacial sediments (17,500 to 25,400 cal years B. P.) of the core retrieved from off Shimokita Peninsula and off Hokkaido, Japa...
Sasakawa, Motoki, Tsunogai, Urumu, Kameyama, Sohiko, Nakagawa, Fumiko, Nojiri, Yukihiro, Tsuda, Atsushi
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS   113(C3)    Mar 2008   [Refereed]
We collected samples of seawater, zooplankton, and sinking particles in the northwestern North Pacific to determine the source of excess CH4 over the saturation value in equilibrium with the atmospheric CH4 in the oxygenated ...
Tsunogai, U., T. Kido, A. Hirota, S.B. Ohkubo, D.D. Komatsu, F. Nakagawa
Rapid Communications in Mass Spectrometry   22(3) 345-354   Jan 2008   [Refereed]
We present a method for high-sensitivity nitrogen isotopic analysis of particulate organic nitrogen (PON) in seawater and freshwater, for the purpose of determining the aquatic nitrogen fixation rate through the 15N(2) tracer technique ...
Suzuki, Ryohei, Ishibashi, Jun-Ichiro, Nakaseama, Miwako, Konno, Uta, Tsunogai, Urumu, Gena, Kaul, Chiba, Hitoshi
RESOURCE GEOLOGY   58(3) 267-288   2008   [Refereed]
The Yonaguni Knoll IV hydrothermal vent field (24 degrees 51'N, 122 degrees 42'E) is located at water depths of 1370-1385 m near the western edge of the southern Okinawa Trough. During the YK03-05 and YK04-05 expeditions using the submersible Shin...
Long-term observation of mass-independent oxygen isotope anomaly in stratospheric CO2
Kawagucci, S., Tsunogai, U., Kudo, S., Nakagawa, F., Honda, H., Aoki, S., Nakazawa, T., Tsutsumi, M., Gamo, T.
ATMOSPHERIC CHEMISTRY AND PHYSICS   8(20) 6189-6197   2008   [Refereed]
Stratospheric and upper tropospheric air samples were collected during 1994-2004 over Sanriku, Japan and in 1997 over Kiruna, Sweden. Using these archived air samples, we determined the triple oxygen-isotope composition of stratospheric CO2</...
Determination of formaldehyde mixing ratios in air with PTR-MS: laboratory experiments and field measurements
Inomata, S., Tanimoto, H., Kameyama, S., Tsunogai, U., Irie, H., Kanaya, Y., Wang, Z.
ATMOSPHERIC CHEMISTRY AND PHYSICS   8(2) 273-284   2008   [Refereed]
Formaldehyde (HCHO), the most abundant carbonyl compound in the atmosphere, is generated as an intermediate product in the oxidation of nonmethane hydrocarbons. Proton transfer reaction mass spectrometry (PTR-MS) has the capability to detect HCHO ...
Toki, T., Tsunogai, U., Gamo, T., Tanahashi, M.
JOURNAL OF GEOCHEMICAL EXPLORATION   95(40911) 29-39   Oct 2007   [Refereed]
We collected sediment samples and pore water samples from the surface sediment on the Daini Atsumi Knoll, and analyzed the sediments for CH4, C2H6, and delta C-13(CH4), and the pore fluids for CH4, C2H6, delta C-13...
Kim, Yongwon, Ueyama, Masahito, Nakagawa, Fumiko, Tsunogai, Urumu, Harazono, Yoshinobu, Tanaka, Noriyuki
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY   59(2) 223-233   Apr 2007   [Refereed]
This research was carried out to estimate the winter fluxes of CO2 and CH4 using the concentration profile method and the chamber method in black spruce forest soils in central Alaska during the winter of 2004/5. The average ...
Kim, Ji-Hoon, Park, Myong-Ho, Tsunogai, Urumu, Cheong, Tae-Jin , Ryu, Byong-Jae, Lee, Young-Joo, Han, Hyun-Chul, Oh, Jae-Ho , Chang, Ho-Wan
ISLAND ARC   16(1) 93-104   Mar 2007   [Refereed]
Geochemical analyses of sediments, pore water and headspace gas of the piston cores taken from the eastern part of Ulleung Basin of the East Sea (Japan Sea) were carried out to assess the origin of the sedimentary organic matter and interstitial f...
Chemical and isotopic characteristics of interstitial fluids within the Taiwan Chelungpu fault
Hirono, Tetsuro, Tsunogai, Urumu, Maegawa, Kenji, Toki, Tomohiro, Tanimizu, Masaharu, Soh, Wonn, Lin, Weiren, Yeh, En-Chao, Song, Sheng-Rong, Wang, Chien-Ying
GEOCHEMICAL JOURNAL   41(2) 97-102   2007   [Refereed]
We determined chloride and sulfate concentrations and (delta D-H2O and delta O-18(H2O) isotope ratios of interstitial fluids extracted from cores from two fault zones within the Taiwan Chelungpu fault. The fluids had higher concentrations of chlor...
Rare earth elements in the hydrothermal system at Okinawa Trough back-arc basin
Hongo, Yayoi, Obata, Hajime, Gamo, Toshitaka, Nakaseama, Miwako , Ishibashi, Junichiro, Konno, Uta, Saegusa, Shunsuke, Ohkubo, Satoru, Tsunogai, Urumu
GEOCHEMICAL JOURNAL   41(1) 40923   2007   [Refereed]
We present novel data sets of rare earth element (REE) distributions in a hydrothermal vent field at Yonaguni Knoll IV in the Okinawa Trough. Vertical REE profiles in three water columns showed horizontal variation of REE concentrations within 100...

Conference Activities & Talks

 
Recent progress in Environmental Sciences using stable isotopes as tracers
13 Sep 2017   The Geochemical Society of Japan
Recent progress in Marine Geochemistry using stable isotopes as tracers
13 Sep 2017   The Geochemical Society of Japan
Quantifying nitrate dynamics in hydrosphere using the triple oxygen isotopes as tracers
Tsunogai, U., Komatsu, D. D., Nakagawa, F.
Utilizing Rare isotopE for biogeochemistrY (UREY) Workshop   2 Oct 2012   
Breakthrough in Isotope-Ratio Mass Spectrometry
Tsunogai, U., D.D. Komatsu, and F. Nakagawa
Pre-seminar 2011 in Busan, Meeting on Isotope-ratio mass spectrometry, The Mass Spectrometry Society of Japan   23 Nov 2011   
Quantifying nitrate dynamics in hydrosphere using the triple oxygen isotopes as tracers
Urumu Tsunogai, Daisuke Komatsu, Fumiko Nakagawa
Japan Geoscience Union Meeting 2011   22 May 2011