Scales and Characteristics of Convective Processes in Orographic Precipitation

从经济和公共安全（山洪暴发）的角度来看，地形降水都很重要。 在这项研究中，首席研究员将调查控制地形降水的物理过程。 要解决的四个问题：1。在冻结面以上几公里的风暴中，聚结和雾凇对降水增长的相对贡献是什么？2.是否有一个显着的差异，降水增长，由于合并之间的风暴，做和不延伸以上的冻结水平？3.对观测到的降水小尺度变率有贡献的降水对流要素的大小分布和间距是什么？4.雨带内部和雨带之间的雨滴谱分布特征是否有显著差异？这项研究将以观测为基础，并将利用从两个已完成的实地方案-中尺度高山方案和太平洋登陆喷流试验-收集的数据。 对上述问题的回答将有助于改进地形降水数值模式中云微物理学的参数化和明确的描述，并有助于更好地描述卫星遥感应用中的采样和射束填充误差。

Orographic precipitation is important both economically and from a public safety (flash flooding) standpoint. In this research, the Principal Investigator will investigate the physical processes that control orographic precipitation. Four questions to be addressed:1. What are the relative contributions of coalescence and riming to accretional growth of precipitation in storms that extend several km above the freezing level?2. Is there a significant difference in precipitation growth due to coalescence between storms that do and do not extend above the freezing level?3. What is the size distribution of and spacing between precipitating convective elements that contribute to the observed small-scale variability of precipitation?4. Is there a significant difference in the characteristics of the raindrop size distribution within fallstreaks and between fallstreaks?The study will be observationally based and will utilize data collected from two completed field programs - the Mesoscale Alpine Programme and the Pacific Landfalling Jets Experiment. The answers to the above questions will contribute to improvement of parameterized and explicit descriptions of cloud microphysics within numerical models of orographic precipitation and to better characterization of sampling and beam filling errors for satellite remote sensing applications.