Articles | Volume 16, issue 3
https://doi.org/10.5194/gmd-16-927-2023
https://doi.org/10.5194/gmd-16-927-2023
Model evaluation paper
 | 
06 Feb 2023
Model evaluation paper |  | 06 Feb 2023

Implementation of HONO into the chemistry–climate model CHASER (V4.0): roles in tropospheric chemistry

Phuc Thi Minh Ha, Yugo Kanaya, Fumikazu Taketani, Maria Dolores Andrés Hernández, Benjamin Schreiner, Klaus Pfeilsticker, and Kengo Sudo

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Short summary
HONO affects tropospheric oxidizing capacity; thus, it is implemented into the chemistry–climate model CHASER. The model substantially underpredicts daytime HONO, while nitrate photolysis on surfaces can supplement the daytime HONO budget. Current HONO chemistry predicts reductions of 20.4 % for global tropospheric NOx, 40–67 % for OH, and 30–45 % for O3 in the summer North Pacific. In contrast, OH and O3 winter levels in China are greatly enhanced.