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BCC_AGCM2.2对东亚-西北太平洋地区夏季大气低频振荡的模拟研究(英文)

房永杰  吴统文  王在志  辛晓歌  刘向文  
【摘要】:The intraseasonal oscillation(ISO) of the East Asia(EA)-Western North Pacific( WNP) summer monsoon represented in the Beijing Climate Center atmospheric g eneral circulation model version 2.2(BCC_AGCM2.2) is analyzed and evaluated a gainst observations.While the model overestimated(underestimated) the mean and variability of ISO over the WNP(EA) summer monsoon region,it can reasonably simulate the space-time features of observed ISO in terms of period,dominate EOF mode,horizontal and vertical structure.However,the model tends to generate more convective instable atmosphere leading to maximum convection center,resulting in stronger ISO-related deep convections.Continuous north propagation of ISO signals can be found in the model but unrealistically weak over the WNP region and strong over EA region when compared with the observation,which is due to the erroneous simulation of the moisture processes.These biases are found to be associated with the northwestward positioned Western Pacific Subtropical High,resulting from the unrealistically strong convective heating in the model.This study suggests the importance of background state of convective heating on the northward propagating ISOs over the EA-WNP region.

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