論文

査読有り
2016年11月

Evolution of the North Pacific Subtropical Gyre during the past 190kyr through the interaction of the Kuroshio Current with the surface and intermediate waters

PALEOCEANOGRAPHY
  • Yurika Ujiie
  • ,
  • Hirofumi Asahi
  • ,
  • Takuya Sagawa
  • ,
  • Franck Bassinot

31
11
開始ページ
1498
終了ページ
1513
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/2015PA002914
出版者・発行元
AMER GEOPHYSICAL UNION

The North Pacific Subtropical Gyre (NPSG) has two important functions, i.e., one in ocean heat transfer and another as a driving force for circulation of the surface and intermediate waters on the basin scale. In the present study, we describe records of the vertical thermal structures and distributions of water masses in the upper ocean of the subtropical northwest (NW) Pacific for the past 190kyr, using two sediment cores collected from the Kuroshio Current area in the East China Sea and the NPSG area. During the two glacial periods, the Kuroshio Current was weakened owing to changes in ocean-atmosphere circulation and eustasy. The differences in the Mg/Ca-derived temperatures between surface and thermocline waters show the changes of depth and temperature (warming) of thermocline during glacial periods. Conversely, the planktonic foraminiferal assemblages demonstrate that the indicator of the intermediate water from the central area of the NPSG increased synchronously with thermocline warming during marine isotope stage (MIS) 6. These results suggest that warm intermediate water strongly affected the changes in the water-column structure of the subtropical NW Pacific during MIS 6. However, during MIS 2, cold water had precedence over intermediate water probably owing to the southward shift of the subtropical front associated with the reduced transport of the Kuroshio Current. Thus, the NPSG has evolved differently during the two glacial periods (MIS 2 and MIS 6) through interactions between the Kuroshio Current, surface water, and intermediate water.

リンク情報
DOI
https://doi.org/10.1002/2015PA002914
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000390648400002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1002/2015PA002914
  • ISSN : 0883-8305
  • eISSN : 1944-9186
  • Web of Science ID : WOS:000390648400002

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