Simulation of the hierarchy structure in tropical disturbances by a three-dimensional model treating the cloud physical process

用处理云物理过程的三维模型模拟热带扰动的层次结构

基本信息

批准号：
01540342
负责人：
ITOH Hisanori
金额：
$ 0.45万
依托单位：
Wakayama 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：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540342/
关键词：
Intraseasonal oscillation Cumulus convection Cloud physics Hierarchy structure 雲物理

项目摘要

Tropical disturbances generally have the hierarchy structure. The typical example is the intraseasonal oscillation in which superclusters having the scale of 1, 000km are composed of mesoscale convection having the scale of lOOkm. The aim of this research is to simulate this hierarchy structure of tropical disturbances, using a model with Yamasaki's parameterization. In this parameterization, cloud water and rainwater as well as water vapor are predicted, and meso-scale convection can be resolved explicitly. The grid length is as fine as 40km in the tropics. Therefore, we can perform a qualitatively different experiment from previous ones. The surface is covered with the ocean whose temperature is zonally uniform and symmetric with respect to the equator.In the simulation, convection near the equator is suppressed and the supercluster does not appear ; the hierarchy structure associated with the intraseasonal oscillation is not well simulated. However, the ITCZ is formed along about 10ﾟN and 10ﾟS, and ITCZ disturbances show the hierarchy structure. That is, their scales are 1, 000km or more, and are composed of meso-scale convection with the scale of 100km. The disturbances generally move westward, while the meso-scale convection is almost stationary. Also in this respect, the characteristics of the hierarchy structure are simulated. Further, it is suggested that these results are attributed to several inherent effects of this model.In the future, sensitivity experiments must be carried out. In particular, an experiment for radiative cooling is important, because this affects the static stability, which in turn has a great influence on the activity of convection near the equator and the moving direction of disturbances. The hierarchy structure associated with the intraseasonal oscillation will probablyappear in this course.

热带疾病通常具有层次结构。典型的例子是季节性振荡，其中超级分类器的尺度为1,000公里，由中尺度结构组成，具有Lookm的尺度。这项研究的目的是使用具有Yamasaki参数化的模型来模拟热带灾难的这种层次结构。在此参数化中，可以预测云水和雨水以及水蒸气，并且可以明确解析中级转换。在热带地区，网格长度与40公里一样细。因此，我们可以与以前的实验进行定性不同的实验。表面被海洋覆盖，海洋的温度是缘缘均匀的，相对于等效器。在模拟中，抑制了等方面附近的结构，并且没有出现超级积体。与季节内振荡相关的层次结构没有很好地模拟。但是，ITCZ沿约10 n和10 s形成，ITCZ灾难显示了层次结构。也就是说，它们的尺度为1,000公里或更高，由100公里的间尺度结构组成。这些灾难通常向西移动，而中尺度的建筑几乎是静止的。同样在这方面，模拟了层次结构的特征。此外，建议这些结果归因于该模型的几种固有效应。未来，必须进行灵敏度实验。特别是，一个辐射冷却的实验很重要，因为这会影响静态稳定性，这反过来又对等等效器附近的对话活动和灾难的移动方向产生了很大的影响。与季节内振荡相关的层次结构可能会出现在本课程中。