热力强迫对湿斜压大气中南亚高压平衡态的影响

MULTIPLE EQUILIBRIA IN MOIST BARO-CLINIC ATMOSPHERE BY THERMAL FORCING RELATED TO SOUTH ASIA HIGH

中文摘要:

      本文基于Lorenz的湿模式,引入地形效应并进行适当简化,在低谱近似下得到了描述大气运动的非线性耗散系统.讨论了在热力强迫与大气环流的非线性相互作用下,湿、斜压大气在参数空间的平衡态与南亚高压的流型分布及其东西摆动.结果表明:南亚高压典型的平衡态流型是西部型、东部型和带状高压,而且东西部流型的转换并非高压中心的连续位移,而是表现为一个高压中心消失后经过流场上的调整重新建立新的高压中心的过程.

英文摘要:

      Based on Lorenz's moist general circulation model, the topography effect is introduced in the model, and it is properly simplified. A nonlinear and dissipative system decribing atmospheric motion has been obtained in approximation of low order. The multiple equilibria of moist baroclinic atmosphere in the parameter space, the flow patterns and longitudinal oscillation of south Asia high by thermal forcing and. nonlinear interaction of general circulation are studied in this paper. The results show that 1) the west pattern, east pattern and beltlike high are the primary equilibria flow patterns of south Asia high, 2) the transformation of flow patterns between east and west flow pattern is a discontinuous displacement, and is a process of resetting new flow pattern by rapid exchange flow field.