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Characterization of Tibetan Soil As a Source or Sink of Atmospheric Persistent Organic Pollutants: Seasonal Shift and Impact of Global Warming
Ren, J (Ren, Jiao)1,3; Wang, XP (Wang, Xiaoping)1,2,4; Gong, P (Gong, Ping)1,2; Wang, CF (Wang, Chuanfei)1,2
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
2019
Volume53Issue:7Pages:3589-3598
DOI10.1021/acs.est.9b00698
Abstract

Background soils are reservoirs of persistent organic pollutants (POPs). After decades of reduced primary emissions, it is now possible that the POPs contained in these reservoirs are being remobilized because of climate warming. However, a comprehensive investigation into the remobilization of POPs from background soil on the largest and highest plateau on Earth, the Tibetan Plateau (TP), is lacking. In this study, a sampling campaign was carried out on the TP at three background sites with different land cover types (forest, meadow and desert). Field measurements of the air-soil exchange of POPs showed that previous prediction using empirical models overestimated the values of the soil-air partitioning coefficient (K-SA), especially for chemicals with K-OA > 9. The direction of exchange for gamma-HCH, HCB, and PCB-28 overlapped with the air-soil equilibrium range, but with a tendency for volatilization. Their emission fluxes were 720, 2935, and 538 pg m(-2) day(-1), respectively, and were similar in extent to those observed for background Arctic soil in Norway. Nam Co and Ngari are also permafrost regions, and most chemicals at these two sites exhibited volatilization. This is the first result showing that permafrost can also emit POPs. Seasonally, we found that chemicals tended to be re-emitted from soils to the atmosphere in winter and deposited from the air to the soil in summer. This finding is opposite to most previous results, possibly because of the higher air-soil concentration gradient caused by the prevailing transport of POPs in summer. Climate warming exerts a strong influence on air-soil exchange, with an increase of 1 degrees C in ambient temperature likely leading to an increase of Tibetan atmospheric inventories of POPs by 60-400%.

Subject AreaEnvironmental Sciences
WOS IDWOS:000463679600026
Language英语
Indexed BySCI
KeywordPolycyclic Aromatic-hydrocarbons Air Partition-coefficients Long-range Transport Organochlorine Pesticides Polychlorinated-biphenyls Spatial-distribution Exchange Climate Pcbs Plateau
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
Cooperation Status国内
ISSN0013-936X
Department环境变化与地表过程
URL查看原文
PublisherAMER CHEMICAL SOC
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9339
Collection图书馆
Corresponding AuthorWang, XP (Wang, Xiaoping)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
2.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Shanxi Univ Finance & Econ, Res Inst Transit Resource Based Econ, Taiyuan 030006, Shanxi, Peoples R China;
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Ren, J ,Wang, XP ,Gong, P ,et al. Characterization of Tibetan Soil As a Source or Sink of Atmospheric Persistent Organic Pollutants: Seasonal Shift and Impact of Global Warming[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2019,53(7):3589-3598.
APA Ren, J ,Wang, XP ,Gong, P ,&Wang, CF .(2019).Characterization of Tibetan Soil As a Source or Sink of Atmospheric Persistent Organic Pollutants: Seasonal Shift and Impact of Global Warming.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(7),3589-3598.
MLA Ren, J ,et al."Characterization of Tibetan Soil As a Source or Sink of Atmospheric Persistent Organic Pollutants: Seasonal Shift and Impact of Global Warming".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.7(2019):3589-3598.
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