Typhoon- and pollution-driven enhancement of reactive bromine in the mid-latitude marine boundary layer  

作　　者：Shanshan Wang Qinyi Li Ruifeng Zhang Anoop Sharad Mahajan Swaleha Inamdar Nuria Benavent Sanbao Zhang Ruibin Xue Jian Zhu Chenji Jin Yan Zhang Xiao Fu Alba Badia Rafael PFernandez Carlos ACuevas Tao Wang Bin Zhou Alfonso Saiz-Lopez 

机构地区：[1]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3),Department of Environmental Scienceand Engineering,Fudan University,Shanghai 200438,China [2]Institute of Eco-Chongming(IEC),Shanghai 202162,China [3]Department of Atmospheric Chemistry and Climate,Institute of Physical Chemistry Blas Cabrera,CSIC,Madrid 28006,Spain [4]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China [5]Environment Research Institute,Shandong University,Qingdao 266237,China [6]Centre for Climate Change Research,Indian Institute of Tropical Meteorology,Ministry of Earth Sciences,Pune 411008,India [7]Department of Chemistry,University of Colorado Boulder,Boulder,CO 80309,USA [8]Institute of Environmentand Ecology,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [9]Sostenipra Research Group,Institute of Environmental Scienceand Technology(ICTA),Universitat Autonoma de Barcelona(UAB),Barcelona 08193,Spain [10]Institute for Interdisciplinary Science(ICB),National Research Council(CONICET),FCEN-UNCuyo,Mendoza M5502JMA,Argentina

出　　处：《National Science Review》2024年第4期87-95,共9页国家科学评论（英文版）

基　　金：supported by the National Key Research and Development Program of China (2022YFC3700303 and 2022YFC3700300);the National Natural Science Foundation of China (41775113);supported by the European Research Council Executive Agency under the European Union’s Horizon 2020 Research and Innovation Programme (ERC-2016-COG 726349 CLIMAHAL, awarded to AS-L);supported by the Hong Kong Research Grants Council (T24-504/17-N, awarded to TW);The Indian Institute of Tropical Meteorology is funded by the Ministry of Earth Sciences,Government of India

摘　　要：Tropospheric reactive bromine is important for atmospheric chemistry,regional air pollution,and global climate.Previous studies have reported measurements of atmospheric reactive bromine species in different environments,and proposed their main sources,e.g.sea-salt aerosol(SSA),oceanic biogenic activity,polar snow/ice,and volcanoes.Typhoons and other strong cyclonic activities(e.g.hurricanes)induce abrupt changes in different earth system processes,causing widespread destructive effects.However,the role of typhoons in regulating reactive bromine abundance and sources remains unexplored.Here,we report field observations of bromine oxide(BrO),a critical indicator of reactive bromine,on the Huaniao Island(HNI)in the East China Sea in July 2018.We observed high levels of BrO below 500 m with a daytime average of 9.7±4.2 pptv and a peak value of∼26 pptv under the influence of a typhoon.Our field measurements,supported by model simulations,suggest that the typhoon-induced drastic increase in wind speed amplifies the emission of SSA,significantly enhancing the activation of reactive bromine from SSA debromination.We also detected enhanced BrO mixing ratios under high NOx conditions(ppbv level)suggesting a potential pollution-induced mechanism of bromine release from SSA.Such elevated levels of atmospheric bromine noticeably increase ozone destruction by as much as∼40%across the East China Sea.Considering the high frequency of cyclonic activity in the northern hemisphere,reactive bromine chemistry is expected to play a more important role than previously thought in affecting coastal air quality and atmospheric oxidation capacity.We suggest that models need to consider the hitherto overlooked typhoon-and pollution-mediated increase in reactive bromine levels when assessing the synergic effects of cyclonic activities on the earth system.

关 键 词：reactive bromine atmospheric chemistry marine boundary layer atmospheric oxidation capacity marine emission 

分 类 号：X51[环境科学与工程—环境工程] P732.3[天文地球—海洋科学]