摘要
Preliminary analyses on simulation of East Asian monsoon (EAM) by IAP 9-level and 2-level Atmosphereic General Circulation Models of AMIP run were made. The analyses include the seasonal and interannual variations of EAM circulation, the monsoon index defined with 850 hpa wind, the circulation differences of composite strong and weak monsoon years and the regional precipitation over China monsoon region. Two models can give reasonable simulation on the seasonal variation of the subtropical high over Western Pacific and the middle latitude circulation index, the observed global circulation differences for strong and weak EAM. However, the abilities of the models on reproducing the cross-equatorial wind of EAM system, the interannual variation of EAM and the regional precipitation variability are unsatisfactory. Improvements on EAM simulation should contain both the better representation on the regional surface details (orography, surface albedo and surface water and energy flux) and the improvement of the tropical global circulation modelling.
Preliminary analyses on simulation of East Asian monsoon (EAM) by IAP 9-level and 2-level Atmosphereic General Circulation Models of AMIP run were made. The analyses include the seasonal and interannual variations of EAM circulation, the monsoon index defined with 850 hpa wind, the circulation differences of composite strong and weak monsoon years and the regional precipitation over China monsoon region. Two models can give reasonable simulation on the seasonal variation of the subtropical high over Western Pacific and the middle latitude circulation index, the observed global circulation differences for strong and weak EAM. However, the abilities of the models on reproducing the cross-equatorial wind of EAM system, the interannual variation of EAM and the regional precipitation variability are unsatisfactory. Improvements on EAM simulation should contain both the better representation on the regional surface details (orography, surface albedo and surface water and energy flux) and the improvement of the tropical global circulation modelling.
