Impact of equatorial and continental airflow on primary greenhouse gases in the northern South China Sea

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题名:	Impact of equatorial and continental airflow on primary greenhouse gases in the northern South China Sea
作者:	歐陽長風;Ou-Yang, Chang-Feng;Yen, Ming-Cheng;Lin, Tang-Huang;Wang, Jia-Lin;Schnell, Russell C;Lang, Patricia M;Chantara, Somporn;Lin, Neng-Huei
贡献者:	理學院化學學系
关键词:	7-SEAS;Air flow;Air masses;Air pollution;Anthropogenic factors;Boundary layers;Carbon dioxide;carbon dioxide (CO;carbon dioxide (CO2);Dongsha Island (DSI);Equator;Greenhouse gases;Greenhouse Gases Observing Satellite (GOSAT);Human influences;Methane;methane (CH;methane (CH4);Mixing ratio;Pollutants;Satellite observation;South China Sea (SCS);Southern Hemisphere;Summer;Troposphere
日期:	2015-06-01
上传时间:	2026-04-21 14:37:04 (UTC+8)
出版者:	IOP Publishing Ltd.;Bristol: IOP Publishing
摘要:	摘要： Four-year ground-level measurements of the two primary greenhouse gases (carbon dioxide (CO _2 ) and methane (CH _4 )) were conducted at Dongsha Island (DSI), situated in the northern South China Sea (SCS), from March 2010 to February 2014. Their mean mixing ratios are calculated to be 396.3 ± 5.4 ppm and 1863.6 ± 50.5 ppb, with an annual growth rate of +2.19 ± 0.5 ppm yr ^–1 and +4.70 ± 4.4 ppb yr ^–1 for CO _2 and CH _4 , respectively, over the study period. Our results suggest that the Asian continental outflow driven by the winter northeast monsoon could have brought air pollutants into the northern SCS, as denoted by significantly elevated levels of 6.5 ppm for CO _2 and 59.6 ppb for CH _4 , which are greater than the marine boundary layer references at Cape Kumukahi (KUM) in the tropical northern Pacific in January. By contrast, the summertime CH _4 at DSI is shown to be lower than that at KUM by 19.7 ppb, whereas CO _2 is shown to have no differences (<0.42 ppm in July) during the same period. Positive biases of the Greenhouse Gases Observing Satellite (GOSAT) L4B data against the surface measurements are estimated to be 2.4 ± 3.4 ppm for CO _2 and 43.2 ± 36.8 ppb for CH _4 . The satellite products retrieved from the GOSAT showed the effects of anthropogenic emissions and vegetative sinks on land on a vertical profiling basis. The prevailing southeasterly winds originating from as far south as the equator or Southern Hemisphere pass through the lower troposphere in the northern SCS, forming a tunnel of relatively clean air masses as indicated by the low CH _4 mixing ratios observed on the DSI in summer. 其他題名： ERL 其他題名： Environ. Res. Lett 出版者： Bristol: IOP Publishing 出版日期： 2015-06-01 出處： Environmental research letters, 2015-06, Vol.10 (6), p.65005 資源來源： Agricultural & Environmental Science Collection 版權： 2015 IOP Publishing Ltd 版權： 2015. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1748-9326 識別號： EISSN: 1748-9326 識別號： DOI: 10.1088/1748-9326/10/6/065005 識別號： CODEN: ERLNAL
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