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

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

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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.

reactive bromineatmospheric chemistrymarine boundary layeratmospheric oxidation capacitymarine emission

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 P.Fernandez、Carlos A.Cuevas、Tao Wang、Bin Zhou、Alfonso Saiz-Lopez

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Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3),Department of Environmental Science and Engineering,Fudan University,Shanghai 200438,China

Institute of Eco-Chongming(IEC),Shanghai 202162,China

Department of Atmospheric Chemistry and Climate,Institute of Physical Chemistry Blas Cabrera,CSIC,Madrid 28006,Spain

Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China

Environment Research Institute,Shandong University,Qingdao 266237,China

Centre for Climate Change Research,Indian Institute of Tropical Meteorology,Ministry of Earth Sciences,Pune 411008,India

Department of Chemistry,University of Colorado Boulder,Boulder,CO 80309,USA

Institute of Environment and Ecology,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China

Sostenipra Research Group,Institute of Environmental Science and Technology(ICTA),Universitat Autoǹoma de Barcelona(UAB),Barcelona 08193,Spain

Institute for Interdisciplinary Science(ICB),National Research Council(CONICET),FCEN-UNCuyo,Mendoza M5502JMA,Argentina

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国家重点研发计划国家重点研发计划国家自然科学基金European Research Council Executive Agency under the European Union's Horizon Research and Innovation Programme(2020)Hong Kong Research Grant CouncilMinistry of Earth Sciences,Government of India

2022YFC37003032022YFC370030041775113ERC-2016-COG 726349 CLIMAHALT24-504/17-N

2024

10.1093/nsr/nwae074

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年,卷(期)：2024.11(4)
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