Estimation of areal precipittion by polarimetric weather radar

这项建议的主要目标是提供算法，能够检索面雨量的测量偏振多普勒天气雷达在C波段工作。研究表明，在某些条件下，例如热带雨或S波段，偏振雷达的估计比传统天气雷达的测量更有优势。为了达到这一目标，雨滴尺寸分布（RDSD）的知识是必要的。了解雨滴的表观形状也至关重要。德国航空航天中心偏振多普勒雷达的观测将用于开发通过雷达测量估算RDSD的技术。与垂直风洞（AQUA-Radar-F，Mainz）中的液滴形状测量合作，将开发表观液滴形状的参数化。Oberpfaffenhofen附近的特殊观察期（SOP）将与其他AQUARadar合作伙伴一起组织，并提供用于评估算法的数据集。在何种程度上开发的算法可以使用设想的业务偏振天气雷达系统的DWD也将进行调查。

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.