Estimation of areal precipittion by polarimetric weather radar

这项提议的主要目标是提供能够从工作在C波段的偏振多普勒天气雷达测量的面雨量中提取面雨量的算法。研究表明，在某些条件下，例如热带雨或S波段，极化雷达的估计比传统天气雷达的测量更具优势。为了达到这一目标，雨滴尺寸分布(RDSD)的知识是必要的。了解雨滴的外观形状也是至关重要的。将利用DLR极化多普勒雷达的观测来开发通过雷达测量估计RDSD的技术。与垂直风洞(AQUA-雷达-F，美因茨)中的液滴形状测量合作，将开发表观液滴形状的参数化。将与AQUARADAR的其他合作伙伴一起在奥贝普法芬霍芬附近组织一个特别观测期，并提供将用于评估算法的数据集。还将调查所开发的算法在多大程度上可以被设想中的DWD偏振天气雷达系统使用。

The main goal of this proposal is to provide algorithms which are able to retrieve areal rain amounts from measurements by a polarimetric Doppler weather radar operating at C-band. Studies show that under certain conditions, e.g. tropical rain or at S-band, polarimetric radar estimates have advantages compared to measurements with a conventional weather radar. To reach this goal knowledge of the raindrop size distribution (RDSD) is necessary. It is also of essential importance to know about the apparent shape of raindrops. Observations with the DLR polarimetric Doppler radar will be used to develop techniques for estimating the RDSD by radar measurements. In co-operation with measurements of drop shapes in a vertical wind tunnel (AQUA-Radar-F, Mainz) a parameterization of the apparent drop shape will be developed. A special observation period (SOP) near Oberpfaffenhofen will be organized together with the other AQUARadar partners and provide data sets which will be used for the evaluation of the algorithms. The degree to which the developed algorithms can be used by envisaged operational polarimetric weather radar systems of the DWD will also be investigated.