Uncertainty in Vertically Integrated Liquid Water Content due to Radar Reflectivity Observation Error
Uncertainty in Vertically Integrated Liquid Water Content due to Radar Reflectivity Observation Error
复制标题
雷达反射率观测误差造成垂直积分液态水含量的不确定性
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
W. Krajewski
中科院分区：
文献类型：
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作者：
M. French;H. Andrieu;W. Krajewski
摘要雷达反射率是用来估计气象量，如降雨率，液态水含量，以及相关的量，垂直积分液态水（VIL）含量。对这些数量的估计取决于与控制大气中水的出现和性质的物理过程的特征有关的若干假设。此外，还有许多与雷达观测相关的误差来源，例如由于亮带、冰雹和液滴尺寸分布近似而引起的误差。这项工作解决了一个错误的利益，雷达反射率观测误差，其他误差源被假定为被纠正或忽略不计。结果是VIL含水量的不确定性和雷达反射率测量误差之间的关系。应用实例说明了典型雷达反射率观测值的VIL不确定性估计，并指出VIL的变异系数远大于VIL的变异系数。
Abstract Radar reflectivity is used to estimate meteorological quantities such as rainfall rate, liquid water content, and the related quantity, vertically integrated liquid (VIL) water content. The estimation of any of these quantities depends on several assumptions related to the characteristics of the physical processes controlling the occurrence and character of water in the atmosphere. Additionally, there are many sources of error associated with radar observations, such as those due to brightband, hail, and drop size distribution approximations. This work addresses one error of interest, the radar reflectivity observation error; other error sources are assumed to be corrected or negligible. The result is a relationship between the uncertainty in VIL water content and radar reflectivity measurement error. An example application illustrates the estimation of VIL uncertainty from typical radar reflectivity observations and indicates that the coefficient of variation in VIL is much larger than the coeff...