Himalayas as a global hot spot of springtime stratospheric intrusions:Insight from isotopic signatures in sulfate aerosols  

作　　者：Kun Wang ShiChang Kang Mang Lin PengFei Chen ChaoLiu Li XiuFeng Yin Shohei Hattori Teresa L.Jackson JunHua Yang YiXi Liu Naohiro Yoshida Mark HThiemens 

机构地区：[1]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences(CAS),Lanzhou,Gansu 730000,China [2]State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,CAS,Guangzhou,Guangdong 510640,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]International Center for Isotope Effects Research(ICIER),School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210023,China [5]Frontiers Science Center for Critical Earth Material Cycling,State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210023,China [6]Department of Chemical Science and Engineering,School of Materials and Chemical Technology,Tokyo Institute of Technology,4259 Nagatsuta-cho,Midori-ku,Yokohama,Kanagawa 226-8502,Japan [7]Department of Chemistry and Biochemistry,University of California San Diego,La Jolla,CA 92093-0021,USA [8]Earth-Life Science Institute,Tokyo Institute of Technology,Meguro-ku,Tokyo 152-8551,Japan [9]National Institute of Information and Communications Technology,Koganei,Tokyo 184-8795,Japan

出　　处：《Research in Cold and Arid Regions》2024年第1期5-13,共9页寒旱区科学（英文版）

基　　金：financially supported by the second Tibetan Plateau Scientific Expedition and Research Program (STEP) (No.2019QZKK0605);the National Natural Science Foundation of China (42371151);the State Key Laboratory of Cryospheric Science (SKLCS-ZZ-2023);the research grant of State Key Laboratory of Isotope Geochemistry (SKLaBIG-KF-22-05);the Natural Science Foundation of Gansu Province (23JRRA648);China Postdoctoral Science Foundation (2022M723358)。

摘　　要：Downward transport of stratospheric air into the troposphere(identified as stratospheric intrusions)could potentially modify the radiation budget and chemical of the Earth's surface atmosphere.As the highest and largest plateau on earth,the Tibetan Plateau including the Himalayas couples to global climate,and has attracted widespread attention due to rapid warming and cryospheric shrinking.Previous studies recognized strong stratospheric intrusions in the Himalayas but are poorly understood due to limited direct evidences and the complexity of the meteorological dynamics of the third pole.Cosmogenic^(35)S is a radioactive isotope predominately produced in the lower stratosphere and has been demonstrated as a sensitive chemical tracer to detect stratospherically sourced air mass in the planetary boundary layer.Here,we report 6-month(April–September 2018)observation of^(35)S in atmospheric sulfate aerosols(^(35)SO_(4)^(2-))collected from a remote site in the Himalayas to reveal the stratospheric intrusion phenomenon as well as its potential impacts in this region.Throughout the sampling campaign,the^(35)SO_(4)^(2-)concentrations show an average of 1,070±980 atoms/m^(3).In springtime,the average is 1,620±730 atoms/m^(3),significantly higher than the global existing data measured so far.The significant enrichments of^(35)SO_(4)^(2-)measured in this study verified the hypothesis that the Himalayas is a global hot spot of stratospheric intrusions,especially during the springtime as a consequence of its unique geology and atmospheric couplings.In combined with the ancillary evidences,e.g.,oxygen-17 anomaly in sulfate and modeling results,we found that the stratospheric intrusions have a profound impact on the surface ozone concentrations over the study region,and potentially have the ability to constrain how the mechanisms of sulfate oxidation are affected by a change in plateau atmospheric properties and conditions.This study provides new observational constraints on stratospheric intrusions in the Himalayas,which

关 键 词：HIMALAYAS Stratospheric intrusions Cosmogenic^(35)SO_(4)^(2-) Ozone Atmospheric oxidation 

分 类 号：P421.3[天文地球—大气科学及气象学] X16[环境科学与工程—环境科学]