| 不同地转速度对季风分布及强度影响的数值模拟 |
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| 引用本文： | 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. |
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| 作者姓名： | 刘冬 李建平 |
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| 作者单位： | 兰州大学大气科学学院, 兰州 730000;中国科学院大气物理研究所大气科学与地球流体力学国家重点实验室, 北京 100029 |
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| 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 |
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| 摘 要： | 本文利用风场标准化季节变率指数来探讨不同地转速度或自转周期下,全球季风的水平和垂直分布特征以及其随自转周期的不同而发生的规律性变化,同时探讨了经、纬向风的季节反向对季风区显著分布的影响.此外,定义一个新的表征季节变化相对大小的指数来探讨不同自转周期下,风场季节变化相对于地球自转周期条件下的强度的相对大小.结果表明,在水...
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| 关 键 词： | 地转速度 自转周期 标准化季节变率 季风 |
Numerical Simulations of the Monsoon Distribution and Intensity at Different Rotation Rates of the Earth |
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| LIU Dong and LI Jianping.Numerical Simulations of the Monsoon Distribution and Intensity at Different Rotation Rates of the Earth[J].Chinese Journal of Atmospheric Sciences,2011,35(4):667-682. |
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| Authors: | LIU Dong and LI Jianping |
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| Institution: | College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| 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. |
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| Keywords: | rotation rate rotation period dynamical normalized seasonality monsoon |
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