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Impacts of Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau

Authors

Yin,  Xiufeng
External Organizations;

Kang,  Shichang
External Organizations;

Foy,  Benjamin de
External Organizations;

Rupakheti,  Dipesh
External Organizations;

/persons/resource/108

Rupakheti,  Maheswar
IASS Institute for Advanced Sustainability Studies Potsdam;

Cong,  Zhiyuan
External Organizations;

Wan,  Xin
External Organizations;

Zhang,  Guoshuai
External Organizations;

Zhang,  Qianggong
External Organizations;

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6001202.pdf
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Citation

Yin, X., Kang, S., Foy, B. d., Rupakheti, D., Rupakheti, M., Cong, Z., Wan, X., Zhang, G., Zhang, Q. (2021): Impacts of Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau. - Geoscience Frontiers, 12, 6, 101255.
https://doi.org/10.1016/j.gsf.2021.101255


Cite as: https://publications.iass-potsdam.de/pubman/item/item_6001202
Abstract
Air pollutants can be transported to the pristine regions such as the Tibetan Plateau, by monsoon and stratospheric intrusion. The Tibetan Plateau region has limited local anthropogenic emissions, while this region is influenced strongly by transport of heavy emissions mainly from South Asia. We conducted a comprehensive study on various air pollutants (PM2.5, total gaseous mercury, and surface ozone) at Nam Co Station in the inland Tibetan Plateau. Monthly mean PM2.5 concentration at Nam Co peaked in April before monsoon season, and decreased during the whole monsoon season (June–September). Monthly mean total gaseous mercury concentrations at Nam Co peaked in July and were in high levels during monsoon season. The Indian summer monsoon acted as a facilitator for transporting gaseous pollutants (total gaseous mercury) but a suppressor for particulate pollutants (PM2.5) during the monsoon season. Different from both PM2.5 and total gaseous mercury variabilities, surface ozone concentrations at Nam Co are primarily attributed to stratospheric intrusion of ozone and peaked in May. The effects of the Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau are complex and require further studies.