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Wind and thermodynamic retrieval of mesoscale convective systems

中尺度对流系统的风和热力学反演

基本信息

批准号：
09680441
负责人：
TSUBOI kazuhisa
金额：
$ 1.98万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680441/
关键词：
mesoscale system Doppler radar retrival method cloud resolving model Baiu front heavy rainfall warm rain squall line 対流のパラメタリゼーションドップラーレーダー観測クラウドクラスター雲の組織化リトリ-バル法

项目摘要

Precipitation systems which cause a heavy rainfall or heavy snowfall are mesoscale convective systems. It is important to develop a method to retrieve wind and thermodynamic variable in the mesoscale convective system as well as to develop a numerical model to resolve a convective cloud.In this study, we develop a retrieval method of wind from a Doppler radar observation and a cloud resolving numerical model. In order to simulate a mesoscale convective system, it is necessary to calculate by a parallel computer in a large computational domain with a high resolution.The cloud model that we are developing is formulated in the non-hydrostatic and compressible equation system. Cloud physics is formulated by a bulk method of warm rain at present and cold rain will be included in the future. A large computational domain (order of 100km) is necessary for the simulation of thunderstorm with a very high resolution (order of less than 1km).In the development of the high resolution cloud model, we tested it with respect to several types of phenomena. In a dry system, the mountain waves and the Kelvin-Helmholtz billows are tested and compared with results obtained by other models. In a wet system, we chose a tornado-producing super cell observed on 24 September 1999 in Japan. The model successfully resolved the vortex of the tornado with the parent super cell.In the future, we will extend the model to include detailed cloud physical processes which resolve size distributions of hydro-meteors.

引起强降雨或大雪的降水系统是中尺度对流系统。开发一种反演中尺度对流系统中风和热力学变量的方法以及开发一种解析对流云的数值模式是很重要的。在这项研究中，我们开发了一种从多普勒雷达观测和云分辨数值模式中检索风的方法。为了模拟中尺度对流系统，需要在大计算域内用并行计算机进行高分辨率的计算。我们正在开发的云模型是用非流体静力可压缩方程组来表示的。云物理目前是以暖雨的整体方法来制定的，未来将包括冷雨。对于非常高分辨率（小于1km）的雷暴模拟，需要一个大的计算域（100km数量级）。在开发高分辨率云模型的过程中，我们对几种类型的现象进行了测试。在干燥系统中，对山波和开尔文-亥姆霍兹波浪进行了测试，并与其他模型得到的结果进行了比较。在一个潮湿系统中，我们选择了1999年9月24日在日本观测到的一个产生龙卷风的超级单体。该模型成功地求解了具有母超级单体的龙卷风涡旋。在未来，我们将扩展该模型，以包括详细的云物理过程，以解决水流星的大小分布。