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Carbonaceous aerosol transport from the Indo-Gangetic Plain to the Himalayas:Carbon isotope evidence and light absorption characteristics

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Geoscience Frontiers 2023年第2期14卷 105-115页

作者： Pengfei Chen Shichang Kang Chaoliu Li Zhaofu Hu Lekhendra Tripathee mukesh Rai Tao Pu Xiufeng Yin Örjan Gustafsson State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Science The Bolin Centre for Climate ResearchStockholm UniversityStockholm 10691Sweden The Bolin Centre for Climate Research Stockholm UniversityStockholm 10691Sweden

The Indo-Gangetic Plain(IGP)is a major regional and global emitter of atmospheric pollutants,which adversely affect surrounding areas such as the *** present a comprehensive dataset on carbonaceous aerosol(CA)composition,radiocarbon(D14C)-based source apportionment,and light absorption of total suspended particle(TSP)samples collected over a 3-year period from high-altitude Jomsom in the central *** 3-year mean TSP,organic carbon(OC),and elemental carbon(EC)concentrations were 92.0±28.6,9.74±6.31,and 2.02±1.35 lg m^(3),respectively,with the highest concentrations observed during the pre-monsoon season,followed by the post-monsoon,winter,and monsoon *** △^(14)C analysis revealed that the contribution of fossil fuel combustion(ffossil)to EC was 47.9%±11.5%,which is consistent with observations in urban and remote regions in South Asia and attests that EC likely arrives in Jomsom from upwind IGP sources via long-range *** addition,the lowest f_(fossil)(38.7%±13.3%)was observed in winter,indicating large contributions in this season from local biomass *** mass absorption cross-section of EC(mACEC:8.27±1.76 m^(2)/g)and watersoluble organic carbon(mACWSOC:0.98±0.45 m^(2)/g)were slightly higher and lower than those reported in urban regions,respectively,indicating that CA undergo an aging *** aerosol coating during transport and variation of biomass burning probably led to the seasonal variation in mAC of two ***,WSOC contributed considerably to the light absorption(11.1%±4.23%)of *** findings suggest that to protect glaciers of the Himalayas from pollution-related melting,it is essential to mitigate emissions from the IGP.

关键词： Carbonaceous aerosol Long-range transport Carbon isotope Source apportionment Light absorption The Himalayas

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