Numerical Modeling of the Atmosphere

该奖项为旨在改进对流层和平流层环流数值模型的广泛研究项目提供了持续支持。长期的好处将是我们预测天气和气候的能力的提高。该项目包括三个主要重点。第一部分涉及与大气建模的动力学和计算方面有关的各种问题，重点是等熵坐标模型的开发、应用和评估。使用等熵坐标系可以克服与其他坐标系相关的某些计算问题，这些问题可能会影响模型中动态过程表示的准确性。这项活动的另一个令人兴奋的部分是混合坐标模型的构建，该模型结合了等熵模型和变深度行星边界层模型。第二个主要领域涉及亚网格尺度过程的参数化，包括(1)地形和(2)湿度，重点是在不同类型的流型和地表边界条件下对流尺度、中尺度和大尺度环流之间的三方相互作用。这将结合观测条件的统计研究和数值模拟来完成。最后，主要研究人员将把一些新的参数化纳入UCLA的环流模型。

This award provides continuing support for a broad research program aimed at improving numerical models of tropospheric and stratospheric circulations. The long-term benefit will be the improvement in our ability to predict weather and climate. The project consists of three major thrusts. The first involves a variety of problems related to dynamical and computational aspects of atmospheric modeling, with the focus being the development, application, and evaluation of an isentropic coordinate model. Using an isentropic coordinate system allows one to overcome certain computational problems associated with other coordinate systems which can affect the accuracy of the representation of dynamical processes in the model. Another exciting part of this activity is the construction of a hybrid-coordinate model that combines the isentropic model with a variable depth planetary boundary layer model. The second major area involves the parameterization of subgrid-scale processes involving (1) orography, and (2) moisture, with emphasis on the three-way interactions between convective-scale, mesoscale and large-scale circulations under various types of flow patterns and surface boundary conditions. This will be done as a combination of statistical studies of observed conditions and numerical simulations. Finally, the principal investigators will incorporate a number of the new parameterizations into the UCLA general circulation model.