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Atmospheric Transport and Bulk Deposition of Organochlorine Compounds at Leigongshan Nature Reserve in Southwest China

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DOI: 10.4209/aaqr.2018.08.0286
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Jiayi Zhou1,2, Libin Liu3, Xin Xu1, Yongfu Yu4, Yang Li4, Haiyan Zhang5, Yue Xu 1

  • 1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
  • 2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
  • 3 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
  • 4 Leigong Mountain National Nature Reserve Administration, Leishan 557100, China
  • 5 The Johns Hopkins University-Nanjing University Center for Chinese and American Studies, Nanjing University, Nanjing 210093, China

Highlights

  • Air concentration of most OCPs and PCBs in southwest China has declined.
  • Wet deposition in rainy season is an important factor influencing atmospheric input.
  • Foggy weather might enhance atmospheric deposition.

Abstract

Atmospheric and bulk deposition samples collected at Leigongshan Nature Reserve (LNR) were analyzed to explore the status, transport, and deposition of atmospheric pollution—specifically, organochlorine compounds—in the foggy mountains of southwest China. Prohibition and restriction of persistent organic pollutants in the surrounding areas has led to a decline in organochlorine pesticides and polychlorinated biphenyls (PCBs), but not hexachlorobenzene (HCB), in the air. Wet deposition is a factor that strongly influences atmospheric input at LNR. Despite their relatively low atmospheric concentration levels, heavy precipitation could increase the deposition of hexachlorocyclohexanes (HCHs) and HCB in the summer. Air HCHs exhibited a “bimodal” pattern, with higher concentrations in spring and autumn and lower concentrations in summer. The low levels in summer are achieved at the expense of high surface input into the ground along their transport routes from South and Southeast Asia to southwest China. The HCB at LNR mainly originates from mainland China. The deposition fluxes are influenced by the enhanced washout of atmospheric particles in the rainy season and elevated particle-associated content in the winter. The potential sources of o,p’-DDT, p,p’-DDT, and PCBs are distributed widely over western low-latitudinal areas and eastern China. Atmospheric transport and deposition in spring and summer contributed to a significant proportion of the annual total fluxes when the air mass arrives from Southeast Asia, increasing rainfall at LNR. The foggy local weather might also enhance this deposition, eventually leading to the accumulation of pollutants at LNR.

Keywords

Air transport Bulk deposition Foggy mountain OCPs PCBs


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