Issue 2, 2024

Improving model representation of rapid ozone deposition over soil in the central Tibetan Plateau

Abstract

Ozone soil deposition contributes a major part to the total deposition of ozone on land covered by low vegetation and perturbs the ozone budget on both regional and global scales. Large model-observation divergences in ozone soil deposition require continuous efforts to improve the mechanical understanding and model representation. Observation of ozone deposition over bare soil directly meets the requirement. Here, we performed field observation of ozone deposition over bare soil first available in the Tibetan Plateau (TP) using the aerodynamic gradient method. A top ozone deposition velocity with a daily mean of 0.49 ± 0.11 (1 sd) cm s−1 (1 May to 10 July 2019) and an hourly mean maximum across the diel pattern of 0.73 ± 0.67 cm s−1 in the afternoon were recorded. Such rapid ozone deposition was mainly attributed to extremely low soil resistance (Rsoil), which was further regulated by median low soil clay content, dry conditions, and strong solar radiation in the central TP. Parameterization of Rsoil in the newly developed Stella scheme was demonstrated to be effective according to our verification. An updated scheme was further attained with the inclusion of our observation and better represents the Rsoil variability than the Stella scheme. More verification is therefore encouraged and hopefully to improve the Stella scheme. Finally, both the Stella scheme and our updated scheme showed great advantages over the oversimplified scheme in current models and should be considered more seriously for the sake of better representation of ozone soil deposition and its variability.

Graphical abstract: Improving model representation of rapid ozone deposition over soil in the central Tibetan Plateau

Supplementary files

Article information

Article type
Paper
Submitted
25 Okt. 2023
Accepted
30 Dec. 2023
First published
03 Janv. 2024
This article is Open Access
Creative Commons BY-NC license

Environ. Sci.: Atmos., 2024,4, 252-264

Improving model representation of rapid ozone deposition over soil in the central Tibetan Plateau

C. Zhang, J. Wang, Y. Zhang, W. Xu, G. Zhang, G. Miao, J. Zhou, H. Yu, W. Zhao, W. Lin, L. Kang, X. Cai, H. Zhang and C. Ye, Environ. Sci.: Atmos., 2024, 4, 252 DOI: 10.1039/D3EA00153A

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