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Indirect contributions of global fires to surface ozone through ozone–vegetation feedback
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2021-08-03 , DOI: 10.5194/acp-21-11531-2021 Yadong Lei , Xu Yue , Hong Liao , Lin Zhang , Yang Yang , Hao Zhou , Chenguang Tian , Cheng Gong , Yimian Ma , Lan Gao , Yang Cao
Atmospheric Chemistry and Physics ( IF 6.3 ) Pub Date : 2021-08-03 , DOI: 10.5194/acp-21-11531-2021 Yadong Lei , Xu Yue , Hong Liao , Lin Zhang , Yang Yang , Hao Zhou , Chenguang Tian , Cheng Gong , Yimian Ma , Lan Gao , Yang Cao
Fire is an important source of ozone (O3) precursors. The formation of surface O3 can cause damage to vegetation and reduce 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 annual mean
O3 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 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 a 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 US (2.0 %), where the high
ambient O3 causes strong O3–vegetation interactions. With the 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.
更新日期：2021-08-03
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