Concentration,sources and wet deposition of dissolved nitrogen and organic carbon in the Northern Indo-Gangetic Plain during monsoon  

作　　者：Hemraj Bhattarai Lekhendra Tripathee Shichang Kang Chhatra Mani Sharma Pengfei Chen Junming Guo Prakriti Sharma Ghimire 

机构地区：[1]Earth System Science Programme and Graduate Division of Earth and Atmospheric Sciences,The Chinese University of Hong Kong,Hong Kong,China [2]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences(CAS),Lanzhou 730000,China [3]Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,CAS,Beijing 100101,China [4]Chinese Academy of Sciences(CAS)Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100085,China [5]Himalayan Environment Research Institute(HERI),Kathmandu,Nepal [6]Central Department of Environmental Science,Tribhuvan University,Kathmandu,Nepal [7]Kathmandu Center for Research and Education(KCRE),Kathmandu,Nepal

出　　处：《Journal of Environmental Sciences》2021年第4期37-52,共16页环境科学学报（英文版）

基　　金：supported by the second Tibetan Plateau Scientific Expedition and Research Program(STEP)(No.2019QZKK0605);the National Natural Science Foundation of China(No.41630754);State Key Laboratory of Cryospheric Sciences(No.SKLCS-ZZ-2020);the Chinese Academy of Science for international Young staff support under President's International Fellowship Initiative(PIFI)(No.2020FYC0001)program;the Research Grants Council(RGC)of Hong Kong for providing Hong Kong PhD Fellowship Scheme(HKPFS),2020/21(No.PF19-33279)。

摘　　要：Precipitation represents an important phenomenon for carbon and nitrogen deposition.Here,the concentrations and fluxes of dissolved organic carbon(DOC)and total dissolved nitrogen(TDN)with their potential sources were analyzed in wet precipitation during summer monsoon from the Northern Indo-Gangetic Plain(IGP),important but neglected area.The volume-weighted mean(VWM)concentration of DOC and TDN were 687.04 and 1210.23μg/L,respectively.Similarly,the VWM concentration of major ions were in a sequence of NH_(4)^(+)>Ca^(2+)>SO_(4)^(2-)>Na^(+)>K^(+)>NO_(3)~->Cl~->Mg^(2+)>F~->NO_(2)~-,suggesting NH_(4)^(+)and Ca^(2+)from agricultural activities and crustal dust played a vital role in precipitation chemistry.Moreover,the wet deposition flux of DOC and TDN were 9.95 and 17.06 kg/(ha year),respectively.The wet deposition flux of inorganic nitrogen species such as NH_(4)^(+)-N and NO_(3)^(-)-N were 14.31 and 0.47 kg/(ha year),respectively,demonstrating the strong influence of emission sources and precipitation volume.Source attribution from different analysis suggested the influence of biomass burning on DOC and anthropogenic activities(agriculture,animal husbandry)on nitrogenous species.The air-mass back trajectory analysis indicated the influence of air masses originating from the Bay of Bengal,which possibly carried marine and anthropogenic pollutants along with the biomass burning emissions to the sampling site.This study bridges the data gap in the less studied part of the northern IGP region and provides new information for policy makers to deal with pollution control.

关 键 词：Precipitation chemistry Dissolved organic carbon Total dissolved nitrogen Major ions Indo-Gangetic Plain 

分 类 号：P426.612[天文地球—大气科学及气象学] X52[环境科学与工程—环境工程]