热带副热带地区初值问题和强迫响应问题的正压正规模态分析

BAROTROPIC NORMAL MODE ANALYSES OF INITIAL VALUE PROBLEM AND FORCING RESPONSE PROBLEM FOR TROPICAL AND SUBTROPICAL AREAS

本文对线性无辐散正压涡度方程模式进行了正规模态分析,讨论了解的性质。然后利用这一结果对观测的1月300hPa基态分别作了初值问题和定常强迫响应问题的研究。结果表明,热带和副热带地区特别是印度洋—西太平洋地区是初值和强迫扰动激发大振幅响应的关键区。

In this paper, a normal mode analysis is made of the linear nondivergent barotropic vorticity equation model with characteristics of the solutions discussed. Then problems of initial values and a steady forcing response are investigated respectively in terms of the normal mode with observed basic state for January 300hPa stream function. The results indicate that the tropical and subtropical regions , especially over the Indian - west Pacific Ocean , are the key regions from which the initial and the forcing disturbances can excite large amplitude responses.