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，我们开发了一种中间气氛的社区通用循环模型。该模型基于东京大学A. Sumi开发的对流层和下层平流层的社区一般循环气候模型，该模型最初是由Kanamitu Et开发的。 al。在日本气象局。该项目中开发的模型是具有T21水平分辨率的光谱模型，其中包括从地面到83公里的高度（模型1）以及从地面到160公里的高度（模型2）。作为垂直坐标系，使用Sigma Phybrid坐标，分辨率约为2.5公里。牛顿冷却辐射方案用于平流层，中层和较低的热层。在不久的将来将引入更准确的辐射方案。使用模型1进行了两年的试验整合。这表明该模型具有表示中间大气循环的定性结构的能力。在北半球冬季，在模型中也模拟了平流层突然的变暖。模型中包括辐射的昼夜循环。在模型2中，上边界足够高以模拟潮汐的垂直传播。使用模型2的试验整合表明，潮汐的高度约为100 km，而Easterlies由于破裂引起的动量沉积而诱导。该模型还用作非线性积分器。例如，研究了昼夜潮汐的非线性传播。结果表明，模型中的干对流调节和非线性可以模拟波高约100公里的饱和度。