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Discussion papers
https://doi.org/10.5194/acp-2019-935
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-935
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 18 Nov 2019

Submitted as: research article | 18 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Ozone-vegetation feedback through dry deposition and isoprene emissions in a global chemistry-carbon-climate model

Cheng Gong1,2, Yadong Lei2,3, Yimian Ma2,3, Xu Yue4, and Hong Liao4 Cheng Gong et al.
  • 1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 2University of Chinese Academy of Sciences, Beijing, 100029, China
  • 3Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 4Jiangsu 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, Nanjing, 210044, China

Abstract. Ozone-vegetation feedback is essential to tropospheric ozone (O3) concentrations. The O3 stomatal uptake damages leaf photosynthesis and stomatal conductance and, in turn, influences O3 dry deposition. Further, O3 directly influences isoprene emissions, an important precursor of O3. The effects of O3 on vegetation further alter local meteorological fields and indirectly influence O3 concentrations. In this study, we apply a fully coupled chemistry-carbon-climate global model (ModelE2-YIBs) to evaluate changes in O3 concentrations caused by O3–vegetation interactions. Different parameterizations and sensitivities of the effect of O3 damage on photosynthesis, stomatal conductance, and isoprene emissions (IPE) are implemented in the model. The results show that O3-induced inhibition of stomatal conductance increases surface O3 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 O3 dry deposition, in addition to the increased temperature and decreased relative humidity from weakened transpiration. Including the effect of O3 damage on IPE slightly reduces surface O3 concentrations by influencing precursors. However, the reduced IPE weakens surface shortwave radiative forcing of secondary organic aerosols leading to increased temperature and O3 concentrations in the eastern U.S. This study highlights the importance of interactions between O3 and vegetation with regard to O3 concentrations and the resultant air quality.

Cheng Gong et al.
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Short summary
We evaluate ozone-vegetation feedback using a fully coupled chemistry-carbon-climate global model (ModelE2-YIBs). Ozone damage to photosynthesis, stomatal conductance, and isoprene emissions parameterized by different schemes and sensitivities are jointly considered. In general, surface ozone concentrations are increased due to ozone-vegetation interactions, especially over the regions with high ambient ozone level such as eastern U.S., eastern China, and western Europe.
We evaluate ozone-vegetation feedback using a fully coupled chemistry-carbon-climate global...
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