論文

2020年6月

Rapid reduction in black carbon emissions from China: evidence from 2009-2019 observations on Fukue Island, Japan

ATMOSPHERIC CHEMISTRY AND PHYSICS
  • Yugo Kanaya
  • ,
  • Kazuyo Yamaji
  • ,
  • Takuma Miyakawa
  • ,
  • Fumikazu Taketani
  • ,
  • Chunmao Zhu
  • ,
  • Yongjoo Choi
  • ,
  • Yuichi Komazaki
  • ,
  • Kohei Ikeda
  • ,
  • Yutaka Kondo
  • ,
  • Zbigniew Klimont

20
11
開始ページ
6339
終了ページ
6356
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.5194/acp-20-6339-2020
出版者・発行元
COPERNICUS GESELLSCHAFT MBH

A long-term, robust observational record of atmospheric black carbon (BC) concentrations at Fukue Island for 2009-2019 was produced by unifying the data from a continuous soot monitoring system (COSMOS) and a Multi-Angle Absorption Photometer (MAAP). This record was then used to analyze emission trends from China. We identified a rapid reduction in BC concentrations of ( - 5.8 +/- 1.5) % yr(-1) or -48 % from 2010 to 2018. We concluded that an emission change of (-5.3 +/- 0.7) % yr(-1), related to changes in China of as much as -4.6 % yr(-1), was the main underlying driver. This evaluation was made after correcting for the interannual meteorological variability (IAV) by using the regional atmospheric chemistry model simulations from the Weather Research and Forecasting (WRF) and Community Multiscale Air Quality (CMAQ) models (collectively WRF/CMAQ) with the constant emissions. This resolves the current fundamental disagreements about the sign of the BC emissions trend from China over the past decade as assessed from bottom-up emission inventories. Our analysis supports inventories reflecting the governmental clean air actions after 2010 (e.g., MEIC1.3, ECLIPSE versions 5a and 6b, and the Regional Emission inventory in ASia (REAS) version 3.1) and recommends revisions to those that do not (e.g., Community Emissions Data System - CEDS). Our estimated emission trends were fairly uniform across seasons but diverse among air mass origins. Stronger BC reductions, accompanied by a reduction in carbon monoxide (CO) emissions, occurred in regions of south-central East China, while weaker BC reductions occurred in north-central East China and northeastern China. Prior to 2017, the BC and CO emissions trends were both unexpectedly positive in northeastern China during winter months, which possibly influenced the climate at higher latitudes. The pace of the estimated emissions reduction over China surpasses the Shared Socioeconomic Pathways (SSPs with reference to SSP1, specifically) scenarios for 2015-2030, which suggests highly successful emission control policies. At Fukue Island, the BC fraction of fine particulate matter (PM2.5) also steadily decreased over the last decade. This suggests that reductions in BC emissions started without significant delay when compared to other pollutants such as NOx and SO2, which are among the key precursors of scattering PM2.5.

リンク情報
DOI
https://doi.org/10.5194/acp-20-6339-2020
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000538582000001&DestApp=WOS_CPL
ID情報
  • DOI : 10.5194/acp-20-6339-2020
  • ISSN : 1680-7316
  • eISSN : 1680-7324
  • Web of Science ID : WOS:000538582000001

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