青藏高原和中国东部汛期环流

THE EFFECTS OF TIBET PLATEAU ON THE GENERAL CIRCULATION OF RAINY SEASON OVER EAST CHINA

摘要:

本文试图通过讨论地形对流体运动的影响,说明青藏高原对东亚大气环流的动力作用。带地形的线性化正压原始方程的分析指出,地形存在时,虽然有地转绕流的平衡态,但是,从任意初态演变的结果不一定趋于该终态。流体运动的过程和结果都已明显区别于一般大气适应过程。本文设计了一个三层半球准地转模式,用于模拟青藏高原对我国东部汛期环流的影响。模拟得到的环流对应着华南、江淮、华北的雨季形势。

Abstract:

The effects of large massif on geostrophic processes are discussed and it is pointed out that, in a linear atmosphere, geostrophic equilibrium may not be attained from an arbitrary initial condition integratable over the whole plane.A three-level quasi-geostrophic model is designed to simulate the general circulation in the rainy season of East China. It is shown that interaction between the Tibet Plateau and the planetary circulation plays an important role in the development of the circulation pattern of the rainy season.