13 Jan 2021

13 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

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

Yadong Lei1,2, Xu Yue3, Hong Liao3, Lin Zhang4, Yang Yang3, Hao Zhou1,2, Chenguang Tian1,2, Cheng Gong2,5, Yimian Ma1,2, Lan Gao1,2, and Yang Cao1,2 Yadong Lei et al.
  • 1Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 2University of Chinese Academy of Sciences, Beijing, 100029, China
  • 3Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology (NUIST), Nanjing, 210044, China
  • 4Laboratory for Climate and Ocean–Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China
  • 5State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

Abstract. Fire is an important source of surface ozone (O3), which causes damage to vegetation and reduces stomatal conductance. Such processes can feed back to inhibit dry deposition and indirectly enhance surface O3. Here, we apply a fully coupled chemistry-vegetation model to estimate the indirect contributions of global fires to surface O3 through O3-vegetation feedback during 2005–2012. Fire emissions directly increase the global mean annual O3 by 1.2 ppbv (5.0 %) with a maximum of 5.9 ppbv (24.4 %) averaged over central Africa by emitting substantial number of precursors. Considering O3-vegetation feedback, fires additionally increase surface O3 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 O3-vegetation interactions, such feedback can rise to > 0.6 ppbv in these fire-prone areas. Moreover, large ratios of indirect-to-direct fire O3 are found in eastern China (3.7 %) and the eastern U.S. (2.0 %), where the high ambient O3 causes strong O3-vegetation interactions. With likelihood of increasing fire risks in a warming climate, fires may promote surface O3 through both direct emissions and indirect chemistry-vegetation feedbacks. Such indirect enhancement will cause additional threats to public health and ecosystem productivity.

Yadong Lei et al.

Status: open (until 13 May 2021)

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Yadong Lei et al.


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Short summary
We present the first estimate of ozone enhancement by fire emissions through ozone-vegetation interactions using a fully coupled chemistry–vegetation model (GC-YIBs). In fire-prone areas, fire-induced ozone causes a positive feedback to surface ozone mainly because of the inhibition effects on stomatal conductance.