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Ozone-vegetation feedback through dry deposition and isoprene emissions in a global chemistry-carbon-climate model.
- Source :
- Atmospheric Chemistry & Physics Discussions; 2019, p1-29, 29p
- Publication Year :
- 2019
-
Abstract
- Ozone-vegetation feedback is essential to tropospheric ozone (O<subscript>3</subscript>) concentrations. The O<subscript>3</subscript> stomatal uptake damages leaf photosynthesis and stomatal conductance and, in turn, influences O<subscript>3</subscript> dry deposition. Further, O<subscript>3</subscript> directly influences isoprene emissions, an important precursor of O<subscript>3</subscript>. The effects of O<subscript>3</subscript> on vegetation further alter local meteorological fields and indirectly influence O<subscript>3</subscript> concentrations. In this study, we apply a fully coupled chemistry-carbon-climate global model (ModelE2-YIBs) to evaluate changes in O<subscript>3</subscript> concentrations caused by O<subscript>3</subscript>-vegetation interactions. Different parameterizations and sensitivities of the effect of O<subscript>3</subscript> damage on photosynthesis, stomatal conductance, and isoprene emissions (IPE) are implemented in the model. The results show that O<subscript>3</subscript>-induced inhibition of stomatal conductance increases surface O<subscript>3</subscript> on average by + 2.1 (+ 1.4) ppbv in eastern China, + 1.6 (- 0.5) ppbv in the eastern U.S., and + 1.3 (+ 1.0) ppbv in western Europe at high (low) damage sensitivity. Such positive feedback is dominated by reduced O<subscript>3</subscript> dry deposition, in addition to the increased temperature and decreased relative humidity from weakened transpiration. Including the effect of O<subscript>3</subscript> damage on IPE slightly reduces surface O<subscript>3</subscript> concentrations by influencing precursors. However, the reduced IPE weakens surface shortwave radiative forcing of secondary organic aerosols leading to increased temperature and O<subscript>3</subscript> concentrations in the eastern U.S. This study highlights the importance of interactions between O<subscript>3</subscript> and vegetation with regard to O<subscript>3</subscript> concentrations and the resultant air quality. [ABSTRACT FROM AUTHOR]
Details
- Language :
- Polish
- ISSN :
- 16807367
- Database :
- Complementary Index
- Journal :
- Atmospheric Chemistry & Physics Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 140046284
- Full Text :
- https://doi.org/10.5194/acp-2019-263