Indirect contributions of global fires to surface ozone through ozone–vegetation feedback

Atmospheric chemistry and physics

article

Lei, Yadong¹  Gao, Lan¹  Cao, Yang¹  Yue, Xu³  Liao, Hong³  Zhang, Lin⁴  Yang, Yang³  Zhou, Hao¹  Tian, Chenguang¹  Gong, Cheng²  Ma, Yimian¹ 

[1] Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology (NUIST);Laboratory for Climate and Ocean–Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences

DOI  :  10.5194/acp-21-11531-2021

学科分类：医学（综合）

来源: Copernicus Publications

【 摘 要 】

Fire is an important source of ozone ( O 3 ) precursors. The formation of surface O 3 can cause damage to vegetation and reduce stomatal conductance. Such processes can feed back to inhibit dry deposition and indirectly enhance surface O 3 . Here, we apply a fully coupled chemistry–vegetation model to estimate the indirect contributions of global fires to surface O 3 through O 3 –vegetation feedback during 2005–2012. Fire emissions directly increase the global annual mean O 3 by 1.2  ppbv (5.0 %) with a maximum of 5.9  ppbv (24.4 %) averaged over central Africa by emitting a substantial number of precursors. Considering O 3 –vegetation feedback, fires additionally increase surface O 3 by 0.5  ppbv averaged over the Amazon in October, 0.3  ppbv averaged over southern Asia in April, and 0.2  ppbv averaged over central Africa in April. During extreme O 3 –vegetation interactions, such a feedback can rise to >0.6   ppbv in these fire-prone areas. Moreover, large ratios of indirect-to-direct fire O 3 are found in eastern China (3.7 %) and the eastern US (2.0 %), where the high ambient O 3 causes strong O 3 –vegetation interactions. With the likelihood of increasing fire risks in a warming climate, fires may promote surface O 3 through both direct emissions and indirect chemistry–vegetation feedbacks. Such indirect enhancement will cause additional threats to public health and ecosystem productivity.

【 授权许可】

CC BY