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Mechanisms and prediction of precipitation over complex terrain

复杂地形降水机理及预测

基本信息

批准号：
5426887
负责人：
Professor Dr. Michael Kunz
金额：
--
依托单位：
Department Troposphärenforschung (IMK-TRO)
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2004
资助国家：
德国
起止时间：
2003-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/5426887?language=en
关键词：
Mechanisms prediction precipitation over complex

项目摘要

The connection between orographically influenced air flow and stratiform precipitation will be studied within the framework of the project an the basis of measured data and model simulations. Based an these results, a simplified module for nowcasting purposes of stratiform precipitation will be developed. Orographic influences and diabatic effects due to phase transformations modify the flow field in a way which is decisive for the orographically induced vertical wind field and, consequently, the intensity of orographically induced precipitation. For this reason, the analysis will first be devoted to identify the effect of flow dynamics an precipitation, such as flow over or around obstacles as well as flow blocking occurring over low mountain ranges during widespread precipitation events. The reliability with which flow fields can be represented by numerical model simulations will be investigated by data comparison. It is aimed to apply a reduced description of basic states of the flow by means of dimensionless numbers, such as Froude numbers, Rossby number or mountain aspect ratio, an the basis of measurement and simulation data. The extent to which orographic enhancement of precipitation over various mountain ranges in Europe can be expressed by these numbers is assessed. A linearized flow and precipitation model is adapted to the observed flow fields and precipitation fields over complex terrain. It will serve as a module for a new nowcasting model in the framework of the SPP 1167 Project Bundle an Nowcasting.

将在该项目的框架内，根据测量数据和模型模拟，研究受地形影响的气流和层状降水之间的联系。根据这些结果，将开发一个用于层状降水临近预报的简化模块。地形的影响和非绝热效应，由于相变修改流场的方式，这是决定性的地形引起的垂直风场，因此，地形引起的降水强度。出于这个原因，分析将首先致力于识别流动动力学的影响，降水，如流动或周围的障碍物，以及流动阻塞发生在低山脉在广泛的降水事件。将通过数据比较研究流场可由数值模型模拟表示的可靠性。它的目的是通过无量纲数，如弗劳德数，罗斯比数或山的长宽比，测量和模拟数据的基础上，应用一个简化的描述的基本状态的流。在何种程度上可以表示这些数字的地形增强降水在欧洲的各种山脉进行评估。线性化的流场和降水模式适用于复杂地形上的流场和降水场。它将作为SPP 1167项目包和即时预报框架内新的即时预报模型的一个模块。