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Atmospheric processes of organic pollutants over a remote lake on the central Tibetan Plateau: implications for regional cycling
Ren, J (Ren, Jiao)1,3; Wang, XP (Wang, Xiaoping)1,2; Wang, CF (Wang, Chuanfei)1,2; Gong, P (Gong, Ping)1,2; Yao, TD (Yao, Tandong)1,2; Wang, XP
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
2017
Volume17Issue:2Pages:1401-1415
DOI10.5194/acp-17-1401-2017
AbstractAtmospheric processes (air-surface exchange, and atmospheric deposition and degradation) are crucial for understanding the global cycling and fate of organic pollutants (OPs). However, such assessments over the Tibetan Plateau (TP) remain uncertain. More than 50% of Chinese lakes are located on the TP, which exerts a remarkable influence on the regional water, energy, and chemical cycling. In this study, air and water samples were simultaneously collected in Nam Co, a large lake on the TP, to test whether the lake is a secondary source or sink of OPs. Lower concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were observed in the atmosphere and lake water of Nam Co, while the levels of polycyclic aromatic hydrocarbons (PAHs) were relatively higher. Results of fugacity ratios and chiral signatures both suggest that the lake acted as the net sink of atmospheric hexachlorocyclohexanes (HCHs), following their long-range transport driven by the Indian monsoon. Different behaviours were observed in the PAHs, which primarily originated from local biomass burning. Acenaphthylene, acenaphthene, and fluorene showed volatilization from the lake to the atmosphere, while other PAHs were deposited into the lake due to the integrated deposition process (wet/dry and air-water gas deposition) and limited atmospheric degradation. As the dominant PAH compound, phenanthrene exhibited a seasonal reversal of air-water gas exchange, which was likely related to the melting of the lake ice in May. The annual input of HCHs from the air to the entire lake area (2015 km(2) ) was estimated as 1.9 kg yr(-1), while input estimated for Sigma(15)PAHs can potentially reach up to 550 kg yr(-1). This study highlights the significance of PAH deposition on the regional carbon cycling in the oligotrophic lakes of the TP.
Subject Area自然地理学
WOS IDWOS:000394610700001
Language英语
Indexed BySCI
KeywordPOLYCYCLIC AROMATIC-HYDROCARBONS WATER GAS-EXCHANGE AIR-SOIL EXCHANGE ORGANOCHLORINE PESTICIDES POLYCHLORINATED-BIPHENYLS SPATIAL-DISTRIBUTION HEXACHLOROCYCLOHEXANES HCHS BACTERIAL COMMUNITY SOUTH ATLANTIC CLIMATE-CHANGE
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences ; Meteorology & Atmospheric Sciences
Cooperation Status国内
SubtypeArticle
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8364
Collection图书馆
Corresponding AuthorWang, XP
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing, Peoples R China.
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Ren, J ,Wang, XP ,Wang, CF ,et al. Atmospheric processes of organic pollutants over a remote lake on the central Tibetan Plateau: implications for regional cycling[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(2):1401-1415.
APA Ren, J ,Wang, XP ,Wang, CF ,Gong, P ,Yao, TD ,&Wang, XP.(2017).Atmospheric processes of organic pollutants over a remote lake on the central Tibetan Plateau: implications for regional cycling.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(2),1401-1415.
MLA Ren, J ,et al."Atmospheric processes of organic pollutants over a remote lake on the central Tibetan Plateau: implications for regional cycling".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.2(2017):1401-1415.
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