Analysis and Simulation of the Seasonal Variation of the Atmospheric Circulation Over Tropical South America

这项研究的目的是描述南美洲热带附近地区对流降水的年度循环，并阐明产生这种循环的因素。将利用从极地轨道卫星测量的1979-1985年期间发出的红外辐射来描述对流模式的年度周期。热带环流型的相应变化将通过对垂直6层的风和其他参数的客观分析得出。还将研究这7年期间南美洲热带地区对流和大气环流的季节内和年际变化。拟议研究的另一个目标是开发和使用一个相对简单的数值模式，用于研究相对于赤道的不同形状和位置的对流热源的动力响应。这项工作具有重要意义，因为它将加深我们对热带大陆对流在维持大尺度大气环流中的作用的理解。

The objective of the research proposed here is to describe the annual cycle of convective rainfall in the vicinity of tropical South America and to elucidate the factors which are responsible for producing it. Description of the annual cycle of convective patterns will be accomplished using outgoing infrared radiation measured from polar orbiting satellites for the period from 1979-1985. Accompanying changes in tropical circulation patterns will be derived from objective analyses of wind and other parameters at 6 levels in the vertical. Intraseasonal and interannual variations in the convection and atmospheric circulation over tropical South America during this 7 year period will also be investigated. A further objective of the proposed research is the development and use of a relatively simple numerical model for studying the dynamical response to convective heating sources of various shapes and locations relative to the equator. This work is important because it will enhance our understanding of the role of tropical continental convection in maintaining large scale atmospheric circulation.