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.

这笔赠款下进行的研究将开发和测试全球非静水大气模型的新方程组。 目前的全球大气模型假设空气运动是静水运动，只要模型的网格间距为数十到数百公里，这是一个合适的假设。 但计算能力的提高引发了人们对分辨率更高（从 1 公里到 10 公里）的全球“云解析”大气模型的兴趣，以便能够解析云尺度上发生的非静水运动。 此类模型被认为是研究各种多尺度大气现象的适当工具，并解决了由于静水模型中对流参数化而出现的问题。 对于全局流体静力模型，存在运动方程的标准形式，通常称为“原始方程”，但目前不存在用于非流体静力全局模型的标准化方程组。 该项目的工作将开发和测试基于统一方程系统（UN）的模型。 联合国系统适用于全球范围，允许气象学感兴趣的非静水运动，同时滤除声波，否则会使大气运动的数值模拟变得复杂。 这项工作的目标是测试联合国系统，并将其与非静水力全球模型的替代方程组进行比较，包括滞弹性系统、伪不可压缩系统和可压缩系统。这项工作将通过促进下一代系统的发展而产生更广泛的影响。 - 用于模拟和预测天气和气候的生成模型。