内外强迫对西太平洋副热带高压中短期演变的影响

The variatoion of the subtropical anticyclone over the western Pacific (SAWP) in the middle troposphere in short and medium terms is thought to result from the anomalies of circulation pattern over Asia and the associated external forcing in this area. Under the support of this project the mechanisms of the spatial and temporal variation of the SAWP have been studed. Through data diagnosis, theoretical study and numerical experiment, our work have focused on the internaction between the dynamical processes, the internal forcing and the diabatic heating, the external forcing, as well as the impacts of this internation on the anamalies of SAWP in summer half year. Specially, we have analyzed the processes of the thermal adaptation of the atmosphere to external forcing, investigated how the circulation adjustments in mid-high latitudes and the dynamical process in high troposphere, as well as the SST anamalies in Indian Ocean and the condensation heating, work on the movements of SAWP in short-medium term. This study has come down to the nonlinear dynamical processes, such as the interaction between the air and sea, as well as between wave and circulation. Thus it is a fundamental subject in basic studies. The results shown in this study are also useful to the forcast of the SAWP.

西太平洋副热带高压中、短期的异常与环流和外强迫的异常有关。本项目拟通过资料分析、理论研究和数值模拟去认识西太平洋副高中、短期东西变化和南北进退的物理机制，探讨大气内部动力过程-倾斜涡度发展和非绝热加热之间的相互作用，以及这种相互作用对夏季西备咝翁斐５挠跋臁Ｎ魈窖蟾备叩闹卸唐谠げ馓峁├砺刍