RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (4): 879-888.doi: 10.11870/cjlyzyyhj202104011

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Influencing Factors of Air-soil Exchange of Persistent Organic Pollutants (POPs)

WENG Jun-he 1,2, SHEN Qi-yan 3, TAN Jian-guo 2,4, LIU Ying 1,2   

  1. (1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; 2. Key Open Laboratory of Climate Change Response in Shanghai, China Meteorological Administration, Shanghai 200092, China; 3. Shanghai Ocean Center Meteorological Station Yangshan Port Meteorological Station, Shanghai 200030, China; 4. Shanghai Climate Center, Shanghai 200030, China)
  • Online:2021-04-20 Published:2021-05-17

Abstract: Soil is not only main sink but also potential source of persistent organic pollutants (POPs) in their long-range atmospheric transportation over the world. Atmosphere-soil exchange of POPs is a key process of their environmental fate, including atmosphere-surface gas (or diffusive) exchange, wet and dry deposition (or atmospheric bulk deposition). Many factors influence the process, including physico-chemical property of POPs, micrometeorological conditions, physico-chemical property of surface soils and land-covered vegetation. This paper briefly reviews the current reports on atmosphere-soil exchange of POPs and related influence factors, and outlooks the need-to-do works in the future, as well as the relative models and equations on the exchange process were listed in this work. Ambient temperature controls partitioning behavior between gas and solid phases (including between gas and particle in atmosphere and between atmosphere and soil compartments), which impact the processes of atmospheric bulk deposition and diffusive exchange between atmosphere and soil compartments. Moreover, temperature vertical profile caused by solar radiation results in a vertical eddy diffusion in air layer close to ground. Horizonal wind speed further improves the eddy diffusion, while atmospheric turbulence reduces deposition of particulate POPs in atmosphere. Soil organic matters, including organic carbons and black carbons, control the sorption and desorption processes of POPs in soil. Furthermore, temperature and humidity in surface soils impact partitioning coefficient of POPs between atmosphere and soil. Soil mineral composition also influences the sorption and desorption of POPs in soils. Vegetation can catch gaseous and particulate POPs from atmosphere by absorption and adsorption, and release them into surface soils by litter, while they can also reduce temperature variation of surface soil covered by vegetation, further decrease volatilization of POPs from soils. Although many positive results in atmosphere-soil exchange have been reported until now, there are still many works needed to develop, e.g., quantification of coupling effects of multiple factors in the atmosphere-soil exchange process, dynamic estimation on the diffusive exchange flux of POPs between atmosphere and soil under in-situ complicate conditions based on typical field study, and quantification of the effect of urban vegetation on removal of atmospheric POPs and accumulation of soil POPs in urban scale.

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