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This study introduces the second version of the Integrated Climate Model(ICM). ICM is developed by the Center for Monsoon System Research, Institute ofAtmospheric Physics to improve the short-term climate prediction of the EastAsia-western North Pacific (EA-WNP). The main update of the second version ofICM (ICM.V2) relative to the first version (ICM.V1) is the improvement of thehorizontal resolution of the atmospheric model from T31 spectral resolution(3.75{\deg}*3.75{\deg}) to T63 (1.875{\deg}*1.875{\deg}). As a result, someimportant factors for the short-term climate prediction of the EA-WNP isapparently improved from ICM.V1 to ICM.V2, including the climatological SST,the rainfall and circulation of the East Asian summer monsoon, and thevariability and spatial pattern of ENSO. The impact of El Ni\~no on the EA-WNPclimate simulated in ICM.V2 is also improved with more realistic anticyclonicanomalies and precipitation pattern over the EA-WNP. The tropical Indian oceancapacitor effect and the WNP local air-sea interaction feedback, two popularmechanisms to explain the impact of El Ni\~no on the EA-WNP climate is alsorealistically reproduced in ICM.V2, much improved relative to that in ICM.V1.

Improved simulation of El Ni\~no and its influence on the climate anomalies of the East Asia-western North Pacific in the ICM Version 2