Does Air-Sea Coupling Improve Tropospheric Ozone Simulation

Abstract

Air-sea coupling has a significant impact on monsoon circulation and precipitation distribution in East Asia during summer. Despite this, its impact on tropospheric ozone simulations has not been extensively researched. We ran the global chemistry transport model using the meteorological data obtained from the coupled general circulation model and the atmospheric circulation model, and analysed the characteristics of the simulations with respect to the distribution of tropospheric ozone over East Asia with and without consideration of the air-sea interaction. When the air-sea interaction was considered, the average concentration of ozone simulated for East Asia in August–September was closer to observation than when the interaction was not considered. This result can be attributed to the improvement in simulating the monsoon circulation and precipitation distribution. The air-sea coupling was also essential in simulating the relationship between the Western North Pacific Subtropical High and East Asian ozone, although there were some errors in the distribution and magnitude of ozone variability. In addition, the model simulations show that the ozone response due to the strengthened monsoonal front is inclined northward in altitude, which calls for further observational evidence.

Keywords: Air-Sea Interaction, Chemistry Transport Model, Tropospheric Ozone, Western North Pacific Subtropical High


Article Review Status: Published

Pages: 39-51 (Download PDF)

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