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Indirect contributions of global fires to surface ozone through ozone-vegetation feedback.
- Source :
- Atmospheric Chemistry & Physics Discussions; 1/13/2021, p1-34, 34p
- Publication Year :
- 2021
-
Abstract
- Fire is an important source of surface ozone (O<subscript>3</subscript>), which causes damage to vegetation and reduces stomatal conductance. Such processes can feed back to inhibit dry deposition and indirectly enhance surface O<subscript>3</subscript>. Here, we apply a fully coupled chemistry-vegetation model to estimate the indirect contributions of global fires to surface O<subscript>3</subscript> through O<subscript>3</subscript>-vegetation feedback during 2005-2012. Fire emissions directly increase the global mean annual O<subscript>3</subscript> 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 O<subscript>3</subscript>-vegetation feedback, fires additionally increase surface O<subscript>3</subscript> 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<subscript>3</subscript>-vegetation interactions, such feedback can rise to >0.6 ppbv in these fire-prone areas. Moreover, large ratios of indirect-to-direct fire O<subscript>3</subscript> are found in eastern China (3.7%) and the eastern U.S. (2.0%), where the high ambient O<subscript>3</subscript> causes strong O<subscript>3</subscript>-vegetation interactions. With likelihood of increasing fire risks in a warming climate, fires may promote surface O<subscript>3</subscript> through both direct emissions and indirect chemistry-vegetation feedbacks. Such indirect enhancement will cause additional threats to public health and ecosystem productivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16807367
- Database :
- Complementary Index
- Journal :
- Atmospheric Chemistry & Physics Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 148171693
- Full Text :
- https://doi.org/10.5194/acp-2020-1264