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Development of a general circulation model of the middle atmosphere

中层大气环流模型的建立

基本信息

批准号：
62540305
负责人：
MIYAHARA Saburo
金额：
$ 1.22万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

In this project we have developed a community general circulation model of the middle atmosphere. This model is based on the community general circulation climate model for troposphere and lower stratosphere developed by A. Sumi at University of Tokyo, this model was originally developed by kanamitu et. al. at Japan Meteorological Agency.The model developed in this project is a spectral model with T21 horizontal resolution, which includes from the ground to 83km height(Model 1) and from the ground to 160km height(Model 2). As a vertical coordinate system, a sigma phybrid coordinate is used with a resolution of about 2.5km. Newtonian cooling radiation scheme is used in the stratosphere, mesosphere and lower thermosphere. In the near future a more accurate radiation scheme will be introduced.A trial integration was conducted for two Model years using model 1. It is shown that the model has a capability to represent a qualitative structure of the middle atmosphere circulation. A stratospheric sudden warming like events are also simulated in the models northern hemisphere winter.A diurnal cycle of the radiation is included in the model. In Model 2, the upper boundary is high enough to simulate the vertical propagation of the tidal waves. A trial integration using Model 2 shows that the tidal waves are breaking at about 100km height and easterlies are induced by the momentum deposition due to the breaking.This model is also used as an nonlinear integrator. As an example, a non-linear propagation of the diurnal tidal waves is investigated. It is shown that the dry convective adjustment and the nonlinearity in the model can simulate the saturation of the wave at about 100km height.

在这个项目中，我们开发了一个社区大气环流模型。该模式是在东京大学A. Sumi开发的对流层和平流层下层社区环流气候模式的基础上建立的，该模式最初是由日本气象厅的kanamitu等人开发的。本项目开发的模式为T21水平分辨率的光谱模式，包括从地面到83km高度（模型1）和从地面到160km高度（模型2）。垂直坐标系采用分辨率约为2.5km的sigma混合坐标系。在平流层、中间层和低层热层采用牛顿冷却辐射方案。在不久的将来，将推出一种更精确的辐射方案。使用模型1进行了两个模型年的试整合。结果表明，该模式具有表征中层大气环流的定性结构的能力。在北半球冬季，模式还模拟了平流层突然变暖的事件。模型中包括了辐射的日循环。在模型2中，上界足够高，可以模拟潮汐波的垂直传播。利用模型2进行的试积分表明，在100km左右的高度潮汐波发生破碎，破碎后的动量沉积诱发了东风风。该模型也可用作非线性积分器。作为一个例子，研究了日潮汐波的非线性传播。结果表明，干对流调整和模式中的非线性可以模拟100km左右高度的波饱和。