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

作　　者：Pengfei Chen Shichang Kang Chaoliu Li Zhaofu Hu Lekhendra Tripathee Mukesh Rai Tao Pu Xiufeng Yin Örjan Gustafsson 

机构地区：[1]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences(CAS),Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Environmental Science,The Bolin Centre for Climate Research,Stockholm University,Stockholm 10691,Sweden [4]The Bolin Centre for Climate Research,Stockholm University,Stockholm 10691,Sweden

出　　处：《Geoscience Frontiers》2023年第2期105-115,共11页地学前缘（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0605);Pan-Third Pole Environment Study for a Green Silk Road(Pan-TPE)(XDA20040501);the National Natural Science Foundation of China(41705132,41630754);the State Key Laboratory of Cryospheric Science(SKLCS-ZZ-2022);the Asia-Pacific Network for Global Change Research(APN)(CRECS2020-07MY-Tripathee);as well as the Swedish Research Council VR Distinguished Professorship grant toÖ.Gustafsson(no.2017-01601).

摘　　要：The Indo-Gangetic Plain(IGP)is a major regional and global emitter of atmospheric pollutants,which adversely affect surrounding areas such as the Himalayas.We 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 Himalayas.The 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 seasons.The △^(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 transport.In addition,the lowest f_(fossil)(38.7%±13.3%)was observed in winter,indicating large contributions in this season from local biomass burning.The 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 process.Organic aerosol coating during transport and variation of biomass burning probably led to the seasonal variation in MAC of two components.Overall,WSOC contributed considerably to the light absorption(11.1%±4.23%)of EC.The 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 

分 类 号：X51[环境科学与工程—环境工程]