首页|Significant chlorine emissions from biomass burning affect the long-term atmospheric chemistry in Asia

Significant chlorine emissions from biomass burning affect the long-term atmospheric chemistry in Asia

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Biomass burning(BB)is a major source of trace gases and particles in the atmosphere,influencing air quality,radiative balance,and climate.Previous studies have mainly focused on the BB emissions of carbon and nitrogen species with less attention on chlorine.Reactive chlorine chemistry has significant effects on atmospheric chemistry and air quality.However,quantitative information on chlorine emissions from BB,particularly the long-term trend and associated atmospheric impacts,is limited both on regional and global scales.Here,we report a long-term(2001-2018)high-resolution BB emission inventory for the major chlorine-containing compounds(HCl,chloride,and CH3C1)in Asia based on satellite observations.We estimate an average of730 Gg yr-1 chlorine emitted from BB activity in Asia,with China contributing the largest share at 24.2％(177 Gg yr-1),followed by Myanmar at 18.7％and India at 18.3％.Distinct seasonal patterns and significant spatial and interannual variability are observed,mainly driven by human-mediated changes in agricultural activity.By incorporating the newly developed chlorine emission inventory into a global chemistry-climate model(CAM-Chem),we find that the BB-chlorine emissions lead to elevated levels of HCl and CH3Cl(monthly average up to 2062 and 1421 parts per trillion by volume(pptv),respectively),subsequently resulting in noticeable changes in oxidants(up to 3.1％in O3 and 17％in OH radicals).The results demonstrate that BB is not only a significant source of air pollutants but also of oxidants,suggesting a larger role of BB emissions in the atmospheric chemistry and oxidation process than previously appreciated.In light of the projected increase in BB activity toward the end of the century and the extensive control of anthropogenic emissions worldwide,the contribution of BB emissions may become fundamental to air quality composition in the future.

biomass burning emissionchlorine emission inventorytropospheric halogen chemistryatmospheric oxidantsCAM-Chem model

Di Chang、Qinyi Li、Zhe Wang、Jianing Dai、Xiao Fu、Jia Guo、Lei Zhu、Dongchuan Pu、Carlos A.Cuevas、Rafael P.Fernandez、Weigang Wang、Maofa Ge、Jimmy C.H.Fung、Alexis K.H.Lau、Claire Granier、Guy Brasseur、Andrea Pozzer、Alfonso Saiz-Lopez、Yu Song、Tao Wang

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Atmospheric Chemistry Department,Max Planck Institute for Chemistry,Mainz 55128,Germany

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 266000,China

Division of Environment and Sustainability,The Hong Kong University of Science and Technology,Hong Kong 999077,China

Environmental Modeling Group,Max Planck Institute for Meteorology,Hamburg 20146,Germany

Institute of Environment and Ecology,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518000,China

Environmental Central Facility,Institute for the Environment,The Hong Kong University of Science and Technology,Hong Kong 999077,China

Atmospheric Chemistry Modeling& Remote Sensing Research Group,Southern University of Science and Technology,Shenzhen 518055,China

Institute for Interdisciplinary Science(ICB),National Research Council(CONICET),FCEN-UNCuyo,Mendoza 5501,Argentina

Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

NOAA Chemical Sciences Laboratory/CIRES,University of Colorado,Boulder,CO 80305,USA

Laboratoire d'Aerologie,CNRS,University of Toulouse UPS,Toulouse 31062,France

Atmospheric Chemistry Observation &Modeling Laboratory,National Center for Atmospheric Research,Boulder,CO 80305,USA

State Key Joint Laboratory of Environmental Simulation and Pollution Control,Department of Environmental Science,Peking University,Beijing 100871,China

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National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Research Grants Council of Hong Kong Special Administrative RegionResearch Grants Council of Hong Kong Special Administrative RegionResearch Grants Council of Hong Kong Special Administrative RegionEuropean Research Council Executive Agency under the European Union's Horizon 2020 Research and Innovation ProgrammeNSF

4212206291744204T24/504/17-N1620902216201623ERC-2016-COG 726349 CLIMAHAL

2024

10.1093/nsr/nwae285

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年,卷(期)：2024.11(9)