Global Boundary Layer Dynamics

本研究计划将研究摩擦边界层内及与摩擦边界层耦合的大尺度环流动力学。一个主要的重点将放在全球大气热带部分的行星纬向尺度上。天气尺度和海洋运动将是次要主题。方法包括理论、建模和观察。将保持与GARP和TOGA项目的紧密联系。理论研究将有两个重点领域。一个是关于平衡流的动态结构，对三维数据分析策略的影响。另一个将是关于不平衡系统，如跨赤道风、边界层向下旋转环流、强迫波和青藏高原效应。观察性研究将使用独特的GARP数据。MONEX湍流季风流的两个结果将完成。FGGE数据将用于确定跨赤道气流和海气动量相互作用的动力学。建模工作将是本基金发展TOGA（热带海洋-全球大气）气候项目视角的一种手段。将采用三层积云边界层模式来了解纬度和时间变化，并与海洋混合层进行耦合实验。模式的改进将包括更高的分辨率和更真实的风切变效果。这项研究对于了解地球的行星边界层如何影响天气和气候以及模拟和预测天气和气候具有重要意义。

This research project will conduct studies on the larger- scale dynamics of circulations within and coupled to frictional boundary layers. One primary emphasis will be on planetary zonal scales in the tropical half of the global atmosphere. Synoptic scales and oceanic motions will be secondary themes. The approaches will be theoretical, modeling, and observational. Strong connections to GARP and TOGA programs will be maintained. Theoretical studies will have two areas of concentration. One will be on dynamic structures of balanced flows, with implications for three-dimensional data analysis strategies. Another will be on unbalanced systems, such as cross-equatorial winds, boundary-layer spin-down circulations, forced waves, and the Tibetan Plateau effect. Observational studies will use the unique GARP data. Two results on turbulent monsoonal flow in MONEX will be completed. FGGE data will be used to determine the dynamics of cross equatorial flow and air-sea momentum interactions. Modeling work will be a means to develop a TOGA (Tropical Ocean-Global Atmosphere) climate program perspective in this grant. A three- level cumulus boundary layer model will be applied to understand latitudinal and time variations, and coupled experiments with an ocean mixed layer will be conducted. Improvements in the model will include higher resolution with more realistic effects of wind shear. This research is important to advances in understanding how the earth's planetary boundary layer influences weather and climate and in modeling and predicting weather and climate.