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

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

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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 35S is a radioactive isotope predomi-nately 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 35S in atmospheric sulfate aerosols(35SO42-)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 35SO42-concentrations show an average of 1,070±980 atoms/m3.In springtime,the average is 1,620±730 atoms/m3,significantly higher than the global existing data measured so far.The sig-nificant enrichments of 35SO42-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 would further provide additional information for a deeper understanding on the environment and climatic changes over the Tibetan Plateau.

HimalayasStratospheric intrusionsCosmogenic 35SO42-OzoneAtmospheric oxidation

Kun Wang、ShiChang Kang、Mang Lin、PengFei Chen、ChaoLiu Li、XiuFeng Yin、Shohei Haattori、Teresa L.Jackson、JunHua Yang、YiXi Liu、Naohiro Yoshida、Mark H.Thiemens

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State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences(CAS),Lanzhou,Gansu 730000,China

University of Chinese Academy of Sciences,Beijing 100049,China

State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,CAS,Guangzhou,Guangdong 510640,China

International Center for Isotope Effects Research(ICIER),School of Earth Sciences and Engineering Nanjing University,Nanjing,Jiangsu 210023,China

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

Department of Chemical Science and Engineering,School of Materials and Chemical Technology,Tokyo Institute of Technology,4259 Nagatsuta-cho,Midori-ku,Yokohama,Kanaga

Department of Chemistry and Biochemistry,University of California San Diego,La Jolla,CA 92093-0021,USA

Earth-Life Science Institute,Tokyo Institute of Technology,Meguro-ku,Tokyo 152-8551,Japan

National Institute of Information and Communications Technology,Koganei,Tokyo 184-8795,Japan

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second Tibetan Plateau Scientific Expedition and Research Program(STEP)National Natural Science Foundation of ChinaState Key Laboratory of Cryospheric Scienceresearch grant of State Key Laboratory of Isotope GeochemistryNatural Science Foundation of Gansu ProvinceChina Postdoctoral Science Foundation

2019QZKK060542371151SKLCS-ZZ-2023SKLaBIG-KF-22-0523JRRA6482022M723358

2024

10.1016/j.rcar.2024.03.002

寒旱区科学(英文版)
中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

影响因子：0.237
ISSN：1674-3822
年,卷(期)：2024.16(1)
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