地形与热源强迫在亚洲夏季风形成与维持中的物理作用

本文利用变换的欧拉平均运动方程组及一个准地转34层球坐标模式来讨论地形与热源强迫对亚洲夏季风形成与维持的物理作用。 通过地形以及地形与热源强迫所产生的准定常行星波E—P通量的散度,强迫经圈环流及扰动地转风速的计算,表明了青藏高原东南部上空夏季的非绝热加热对于亚洲夏季风形成与维持起着重要作用,它远大于地形的动力作用。 计算结果还表明:地形与热源对亚洲夏季风形成与维持的物理作用中,它通过强迫经圈环流的作用要大于强迫波E—P通量的散度的作用。

THE EFFECTS OF TOPOGRAPHYCAL AND THERMAL FORCING ON FORMATION AND MAINTENANCE OF THE SUMMER MONSOON OVER ASIA

The transformed Eularian-mean motion equations and a quasi-geostrophic,34-level spherical coordinate model are used to discuss the physical effects of topographical and heating forcing on formation and maintenance of the summer monsoon over Asia.The computed results of the divergence of E-P flux,the forced rneridional circulation and perturbation geostrophic wind show that diabatic heating over the Qinghai-xizang plateau play an important role for formation and maintenance of the summer monsoon over Asia,and this effect is much larger than the dynamical effect of topography.The computed results also show that the effect due to the forced rreridional circulation is larger than that due to the divergence of E-P flux of forced Wayes.