Variograms of Radar Reflectivity to Describe the Spatial Continuity of Alpine Precipitation
Variograms of Radar Reflectivity to Describe the Spatial Continuity of Alpine Precipitation
复制标题
描述高山降水空间连续性的雷达反射率变异函数
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Joss
中科院分区：
文献类型：
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作者：
U. Germann;J. Joss
摘要利用雷达反射率的变异函数作为概括统计量，描述了阿尔卑斯山降水在中伽马尺度上的空间连续性。首先，如何获得这样的变异函数进行了讨论。第二，一组典型的变差函数的阿尔卑斯山降水被发现。第三，一些例子，这些变差函数可以用来解决几个问题，如，什么样的空间变化，可以发现在阿尔卑斯山流域的降水率？相隔一定距离的两点的测量值之间的差异是什么？从点观测值估算面降水量的精度如何？在阿尔卑斯山降水中有对流的首选区域吗？变差函数是使用矩量法估计连同高分辨率极反射率数据的可见区域。根据不同的应用，变异函数的线性降水率，对数反射率，或线性反射率。空间连续性...
Abstract The authors use variograms of radar reflectivity as a summary statistic to describe the spatial continuity of Alpine precipitation on mesogamma scales. First, how to obtain such variograms is discussed. Second, a set of typical variograms of Alpine precipitation is found. Third, some examples are given on how these variograms can be used to tackle several questions such as, What spatial variation of precipitation rate can be found in Alpine catchments? What difference can be expected between the measurements at two points separated by a given distance? To what accuracy can areal precipitation be estimated from point observations? Are there preferred regions for convection in Alpine precipitation? Variograms are obtained using a method-of-moments estimator together with high-resolution polar reflectivity data of well-visible regions. Depending on the application, the variogram was determined in terms of linear precipitation rate, logarithmic reflectivity, or linear reflectivity. Spatial continuity...