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.

在这笔赠款下进行的研究将为全球非静力大气模型开发和测试一个新的方程系统。当前的全球大气模型假设空气运动是流体静力学的，如果模型的网格间距为几十到数百公里，这是一个合适的假设。但计算能力的增加导致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，这样就可以解析云尺度上发生的非静力运动。这种模式被认为是研究各种多尺度大气现象的合适工具，并解决了由于流体静力模式中对流的参数化而产生的问题。对于全球静力模型，有一种标准形式的运动方程，通常被称为“原始方程”，但目前还不存在一套标准化的非静力全球模型方程。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领域，允许气象方面的非静力运动，同时过滤声波，否则将使大气运动的数值模拟复杂化。这项工作的目标是测试联合国系统，并将其与非静力全球模拟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。这项工作将产生更广泛的影响，有助于开发用于天气和气候模拟和预测的下一代模式。