Preprints
https://doi.org/10.5194/egusphere-2024-365
https://doi.org/10.5194/egusphere-2024-365
17 Apr 2024
 | 17 Apr 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Global assessment of climatic responses to the ozone-vegetation interactions

Xinyi Zhou, Xu Yue, Chenguang Tian, and Xiaofei Lu

Abstract. The coupling between surface ozone (O3) and vegetation significantly influences regional to global climate. O3 uptake by plant stomata inhibits photosynthetic rate and stomatal conductance, impacting evapotranspiration through land surface ecosystems. Using the climate-vegetation-chemistry coupled ModelE2-YIBs model, we assess the global climatic responses to O3-vegetation interactions during boreal summer of 2010s (2005–2014). High O3 pollution reduces stomatal conductance, resulting in the warmer and drier conditions worldwide. The most significant responses are found in the eastern U.S. and eastern China, where local latent heat flux decreases by -8.17 % and -9.48 %, respectively. Consequently, surface air temperature rises by +0.33 °C and +0.56 °C, and sensible heat flux rises by +16.54 % and +25.46 % in the two hotspot regions. The O3-vegetation interaction also affects atmospheric pollutants. Surface O3 concentrations increase by +1.26 ppbv in eastern China and +0.98 ppbv in eastern U.S. due to the O3-induced inhibition of stomatal uptake. With reduced atmospheric stability following the warmer climate, increased cloudiness but decreased relative humidity jointly reduce aerosol optical depth (AOD) over eastern China. This study suggests that vegetation feedback should be considered for a more accurate assessment of climatic perturbations caused by tropospheric O3.

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Xinyi Zhou, Xu Yue, Chenguang Tian, and Xiaofei Lu

Status: open (until 29 May 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-365', Anonymous Referee #1, 09 May 2024 reply
  • RC2: 'Comment on egusphere-2024-365', Anonymous Referee #2, 09 May 2024 reply
Xinyi Zhou, Xu Yue, Chenguang Tian, and Xiaofei Lu
Xinyi Zhou, Xu Yue, Chenguang Tian, and Xiaofei Lu

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Short summary
With a climate-vegetation-chemistry coupled model, we explore global climatic responses to the ozone-vegetation interactions in 2010s (2005–2014). We find strong warming and drying effects due to the ozone-induced inhibition on plant stomatal conductance, especially over the polluted regions such as eastern U.S. and China. These climatic perturbations further enhance surface ozone by decreasing dry deposition, but reduce aerosol optical depth by increasing cloudiness and the drought tendency.