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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.

热带扰动一般具有层次结构。典型的例子是由100km尺度的中尺度对流组成1000km尺度的超星系团的季节内振荡。本研究的目的是模拟热带扰动的这种层次结构，使用模式与山崎的参数化。在这个参数化，云水和雨水以及水汽的预测，中尺度对流可以明确地解决。在热带地区，网格长度可达40公里。因此，我们可以进行与以前实验性质不同的实验。在模拟中，赤道附近的对流被抑制，超星系团没有出现，与季节内振荡相关的层次结构也没有得到很好的模拟。而ITCZ则沿着10 ° N、10 ° S左右形成，ITCZ扰动具有层次结构。也就是说，它们的尺度在1000公里以上，由100公里尺度的中尺度对流组成。扰动总体上向西移动，而中尺度对流基本上是静止的。同样在这方面，模拟的层次结构的特性。此外，我们认为这些结果是由于该模型的几个固有的影响，在未来，敏感性实验必须进行。特别是，辐射冷却的实验是重要的，因为这会影响静态稳定性，这反过来又对赤道附近的对流活动和扰动的移动方向有很大的影响。在这一过程中可能会出现与季节内振荡相关的层次结构。