Considering Air-sea Coupling Improves the Simulation of the Tropospheric Ozone in a Chemical Transport Model

Simulating the tropospheric ozone realistically under both present day and future has been both a scientific challenge and of social importance, but little is known about the impact of the air-sea coupling on the modeling. Two experiments of the global chemistry transport model (CTM) are compared, each are driven by meteorological fields coming from either atmosphere-ocean global climate model (AOGCM) or atmospheric general circulation model (AGCM). The annual cycle of the tropospheric ozone and its interannual variability associated with El Niņo are improved, where the CTM driven by AOGCM input from AGCM. The improvement is likely to be caused by the reduced biased in simulation of the water vapor as well as vertical motion mainly result from the air-sea interactions. Our results suggest that air-sea interactions may be a significant factor of tropospheric ozone and need to be considered in chemical transport models.

This subject is supported by Korea Ministry of Environment as "Climate Change Correspondence Program.