大气科学2011，Vol.35Issue(4)：667-682,16.
不同地转速度对季风分布及强度影响的数值模拟
Numerical Simulations of the Monsoon Distribution and Intensity at Different Rotation Rates of the Earth
摘要
Abstract
Characteristics and regular variabilities at different rotation rates are discussed for the horizontal and vertical distributions of the global monsoon by the Dynamical Normalized Seasonality (DNS). Effects of the seasonal changes of meridional and longitudinal wind directions on monsoon areas are also analyzed. Furthermore, a new index is defined to discuss relative seasonal change of wind at different rotation rates compared to the Earth rotation rate. It is showed that typical monsoon areas change with different rotation rates. Horizontally, the DNS is remarkable in the zonal direction at fast rotation rates, and the monsoon areas become smaller and smaller with rotation period increasing. However, at slow rotation rates the DNS is remarkable locally in the meridional direction, and the monsoon areas become larger and larger as the rotation period becomes longer. Vertically, the remarkable DNS distributes irregularly near the surface at fast rotation rates, which is mainly in the equatorial and tropical areas at slow rotation rates with a larger area in the Northern Hemisphere than in the Southern Hemisphere. At levels above 100 hPa and below 500 hPa, the remarkable DNS areas are mainly between 30°S and 30°N, whose intensity and north-to-south width vary regularly with different rotation periods. Above 100 hPa, the remarkable DNS areas, whose maximum intensity changes regularly with different rotation periods, are primarily in the equatorial and subtropical areas with hemispherical symmetrical pattern at fast rotation rates, while they decrease markedly and even disappear at slow rotation rates. Besides, seasonal difference of the zonal wind is the main reason for the remarkable DNS at fast rotation rates. But the seasonal difference of meridional winds causes remarkable DNS at slow rotation rates especially blow 100 hPa. Otherwise, the relative seasonal change of wind at fast rotation rates compared to the Earth rotation rate is remarkable primarily above the equatorial and tropical areas, and the remarkable change areas distribute widely at slow rotation rates and become smaller and smaller above 100 hPa. With the rotation period increasing.关键词
地转速度/自转周期/标准化季节变率/季风Key words
rotation rate, rotation period, dynamical normalized seasonality, monsoon分类
天文与地球科学引用本文复制引用
刘冬,李建平..不同地转速度对季风分布及强度影响的数值模拟[J].大气科学,2011,35(4):667-682,16.基金项目
国家重点基础研究发展规划项目2010CB950400,国家自然科学基金资助项目41030961、40821092 （）
