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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Combined Space and Ground Radars for Improving Quantitative Precipitation Estimations in the Eastern Downstream Region of the Tibetan Plateau. Part I: Variability in the Vertical Structure of Precipitation in ChuanYu Analyzed from Long-Term Spaceborne Observations by TRMM PR
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Combined Space and Ground Radars for Improving Quantitative Precipitation Estimations in the Eastern Downstream Region of the Tibetan Plateau. Part I: Variability in the Vertical Structure of Precipitation in ChuanYu Analyzed from Long-Term Spaceborne Observations by TRMM PR

机译：综合空间与地雷达，以提高藏高原东部下游区域的定量降水估计。 第I部分：由TRMM PR的长期星源观测分析轴宇垂直结构的可变性

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摘要

This study presents a statistical analysis of the variability of the vertical structure of precipitation in the eastern downstream region of the Tibetan Plateau as measured by the Precipitation Radar (PR) on the National Aeronautics and Space Administration Tropical Rainfall Measuring Mission (TRMM) satellite. Data were analyzed over an 11-yr time span (January 2004-December 2014). The results show the seasonal and spatial variability of the storm height, freezing level, and bright band for different types of precipitation as well as the characteristics of intensity-related and type-related vertical profiles of reflectivity (VPR). Major findings were as follows: About 90% of the brightband peak reflectivity of stratiform precipitation was less than 32 dBZ, and 40% of the maximum reflectivity of convective precipitation exceeded 35 dBZ. The intensity of surface rainfall rates also depended on the shapes of VPRs. For stratiform precipitation, ice-snow aggregation was faster during moderate and heavy rainfall than it was in light rainfall. Since both the moisture and temperature are lower in winter, the transformation efficiency of hydrometeors becomes slower. Typical Ku-band representative climatological VPRs (CPRs) for stratiform precipitation have been created on the basis of the integration of normalized VPR shape for the given area and the rainfall intensity. All of the findings indicate that the developed CPRs can be used to improve surface precipitation estimates in regions with complex terrain where the ground-based radar net has limited visibility at low levels.
机译：本研究介绍了藏高原东部下游地区垂直结构垂直结构的统计分析，通过沉淀雷达（公关国家航空航天局的热带降雨测量使命（TRMM）卫星测量。通过11年的时间跨度（2014年1月至12月）分析数据。结果表明了风暴高度，冷冻水平和亮频带的季节性和空间可变性，以及不同类型的降水以及反射率相关和相关垂直型材的特征（VPR）。主要发现如下：结构层状沉淀的大约90％的亮点峰值反射率小于32dBz，对流沉淀的最大反射率的40％超过35 dBz。表面降雨率的强度也取决于VPRS的形状。对于层状沉淀，在降雨量的温和降雨中，冰雪聚集比下降更快。由于冬季水分和温度都较低，因此水分仪的变换效率变慢。基于归一化VPR形状的集成区域和降雨强度的归一化VPR形状的整合，创建了用于层状沉淀的典型KU频段代表性气候VPRS（CPRS）。所有调查结果表明，开发的CPRS可用于改善具有复杂地形的区域中的表面降水估计，其中基于地基雷达网的低水平可见性有限。

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