气候变化领域集成服务门户(CCPortal): Baseline continental aerosol over the central Tibetan plateau and a case study of aerosol transport from South Asia

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DOI	10.1016/j.atmosenv.2011.07.067
	Baseline continental aerosol over the central Tibetan plateau and a case study of aerosol transport from South Asia
	Xia, Xiangao; Zong, Xumei; Cong, Zhiyuan; Chen, Hongbin; Kang, Shichang; Wang, Pucai
发表日期	2011
ISSN	1352-2310
EISSN	1873-2844
卷号	45 期号:39
英文摘要	Using 22 months of sunphotometer observations at Nam Co, an Aerosol Robotic Network (AERONET) site located in the central Tibetan Plateau, the background level of aerosol in this remote continental site was analyzed for the first time. An extraordinary pollution episode with an aerosol optical depth at 500 nm (tau) of an order of magnitude higher than the baseline was further studied using ground-based and satellite remote-sensing data. The annual aerosol baseline at Nam Co is tau = 0.029, which is about half of that over the Pacific Ocean and the Atlantic Ocean. Sunphotometer observations at Nam Co recorded an intense spring atmospheric pollution episode, with the maximum tau of 0.42 on 16 March 2009. The episode was characterized by dominant fine particles with strong absorption. A large tau value with similar size and absorption also occurred in the Indo-Gangetic plains and South Asia, suggesting the transportation of aerosols to the Tibetan Plateau from surrounding regions. The passive satellite data showed dense plumes associated with active fires in the Himalayan foothills, the Indo-Gangetic plains, and South Asia and a thick, widespread haze piling up against the Himalayan ridges and impinging upon adjacent valleys. A pollution pool with a thick layer rich with aerosol over the Ganges Plain in Northern India, as revealed by the active satellite data, extended up to 3-5 km during this period, making it possible for the transportation of aerosols to the central Tibetan Plateau by the southwesterly wind prevailing at that level. Further studies are urgently required to identify the transport mechanism and to reveal the potential climatic impacts of aerosol transportation to the Tibetan Plateau. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
关键词	Aerosol Tibetan plateau Baseline Transportation
学科领域	Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
来源期刊	ATMOSPHERIC ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111609
作者单位	Chinese Acad Sci, Key Lab Middle Atmosphere & Global Environm Obser, Inst Atmospher Phys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Xia, Xiangao,Zong, Xumei,Cong, Zhiyuan,et al. Baseline continental aerosol over the central Tibetan plateau and a case study of aerosol transport from South Asia[J]. 中国科学院西北生态环境资源研究院,2011,45(39).
APA	Xia, Xiangao,Zong, Xumei,Cong, Zhiyuan,Chen, Hongbin,Kang, Shichang,&Wang, Pucai.(2011).Baseline continental aerosol over the central Tibetan plateau and a case study of aerosol transport from South Asia.ATMOSPHERIC ENVIRONMENT,45(39).
MLA	Xia, Xiangao,et al."Baseline continental aerosol over the central Tibetan plateau and a case study of aerosol transport from South Asia".ATMOSPHERIC ENVIRONMENT 45.39(2011).