Testing the Unified System of Equations in Atmospheric Models

测试大气模型中的统一方程组

• 批准号: 1062468
• 负责人: Celal Konor
• 金额: $ 30.28万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2015-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1062468&HistoricalAwards=false
• 关键词: Testing; Unified; System; Equations; Atmospheric

Research conducted under this grant will develop and test a new system of equations for global nonhydrostatic atmospheric models. Current global atmospheric models assume that air motions are hydrostatic, which is an appropriate assumption provided that the grid spacing of the model is tens to hundreds of kilometers. But increases in computing power have led to interest in global "cloud resolving" atmospheric models with much higher resolutions, from 1 to 10 kilometers, so that the nonhydrostatic motions occurring on the cloud scale can be resolved. Such models are considered appropriate tools for studying a variety of multiscale atmospheric phenomena, and resolve the problems that arise due to the parameterization of convection in hydrostatic models. For global hydrostatic models there is a standard form of the equations of motion, generally referred to as the "primitive equations", but a standardized set of equations for nonhydrostatic global models does not presently exist. Work in this project will develop and test models based on the Unified System (UN) of equations. The UN system is applicable on a global domain and allows nonhydrostatic motions of meteorological interest while filtering out sound waves, which would otherwise complicate the numerical simulation of atmospheric motions. The goal of the work is to test the UN system and compare it against alternative equations sets for nonhydrostatic global modeling, including the anelastic system, pseudo-incompressible, and the compressible systems.The work will have broader impacts by contributing to the development of next-generation models to be used for the simulation and prediction of weather and climate.

根据该赠款进行的研究将开发和测试全球非液压大气模型的新方程系统。 当前的全球大气模型假设空气运动是静静力的，这是一个适当的假设，前提是模型的网格间距是数十万公里。 但是，计算能力的增加导致对全球“云解决”大气模型的兴趣，分辨率从1到10公里，因此可以解决在云量表上发生的非遗水运动。 这样的模型被认为是研究各种多尺度大气现象的合适工具，并解决了由于静水模型中对流的参数化而引起的问题。 对于全球静水压模型，运动方程的标准形式通常称为“原始方程”，但是目前不存在非遗水全局模型的标准化方程组。 该项目中的工作将基于方程式统一系统（UN）开发和测试模型。 联合国系统适用于全球域，并允许气象兴趣的非静态运动，同时过滤声波，这否则会使大气运动的数值模拟复杂化。 这项工作的目的是测试联合国系统，并将其与非静态全球建模的替代方程式集进行比较，包括无弹性系统，伪压缩系统以及可压缩的系统。这项工作将对下一代模型的开发做出更大的影响，以用于天气和气候的模拟和预测。