South-hemispheric marine aerosol Hg and S isotope compositions reveal different oxidation pathways  

作　　者：David AuYang Jiubin Chen Wang Zheng Yanxu Zhang Guitao Shi Jeroen ESonke Pierre Cartigny Hongming Cai Wei Yuan Liangzhi Liu Pengxue Gai Congqiang Liu 

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]School of Earth System Science,Institute of Surface-Earth System Science,Tianjin University,Tianjin 300072,China [3]Joint International Research Laboratory of Atmospheric and Earth System Sciences,School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China [4]Key Laboratory of Geographic Information Science(Ministry of Education),School of Geographic Sciences and State Key Lab of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China [5]Polar Research Institute of China,Shanghai 200062,China [6]Géosciences Environnement Toulouse,CNRS/IRD/UniversitéPaul Sabatier Toulouse 3,Toulouse 31400,France [7]Laboratoire de Géochimie des Isotopes Stables,Institut de Physique du Globe de Paris,UniversitéParis Diderot,CNRS UMR 7154,Sorbonne Paris-Cité,1 rue de Jussieu,Paris 75005,France [8]School of Civil Engineering,Tianjin University,Tianjin 300072,China

出　　处：《National Science Open》2022年第2期47-64,共18页国家科学进展（英文）

基　　金：supported by the National Natural Science Foundation of China(41830647,41625012,41961144028,U1612442);JB.C and the Chinese Academy of Sciences President’s International Fellowship Initiative PIFI-C(2018PC0034)to D.AY.

摘　　要：Particle-bound mercury(PBM)records the oxidation of elemental mercury,of which the main oxidation pathways(Br∙/Cl∙/OH∙/O3)remain unclear,especially in the Southern Hemisphere.Here,we present latitudinal covariations of Hg and Sisotopic anomalies in cross-hemispheric marine aerosols that evidence an equator-to-poleward transition of Hg oxidants from OH∙/O3 in tropics to Br∙/Cl∙in polar regions highlighting thus the presence of distinct oxidation processes producing PBM.The correlations between Hg,S and O-isotopic compositions measured in PBM,sulfates and nitrates respectively within the aerosols highlight the implication of common oxidants in their formations at different latitudes.Our results open a new window to better quantify the present-day atmospheric Hg,S and N budgets and to evaluate the influences of aerosols on climate and ecosystems once the isotopic fractionations associated with each process have been determined.

关 键 词：mercury sulfur AEROSOLS OXIDATION mass independent fractionation marine 

分 类 号：X513[环境科学与工程—环境工程]