Global precipitation estimates based on a technique for combining satellite-based estimates, rain gauge analysis, and NWP model precipitation information
Global precipitation estimates based on a technique for combining satellite-based estimates, rain gauge analysis, and NWP model precipitation information
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DOI：
10.1175/1520-0442(1995)008
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发表时间：
1995-05
影响因子：
4.9
通讯作者：
G. Huffman;R. Adler;B. Rudolf;U. Schneider;P. Keehn
中科院分区：
文献类型：
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作者：
G. Huffman;R. Adler;B. Rudolf;U. Schneider;P. Keehn
本文介绍了一种将微波卫星资料、红外卫星资料、雨量计分析和数值天气预报模式的降水估计与改进的全球降水估计相结合的“卫星-雨量计-模型”（SGM）技术。在整个过程中，采用了2.5° × 2.5°横向网格上的月度估计。首先，利用北纬40度至南纬40度范围内的低轨道微波和地球同步轨道红外数据（经调整的地球同步降水指数）以及仅利用高纬度地区的低轨道微波数据，开发一种多卫星产品。然后引入雨量计分析，通过其逆相对误差方差对每个字段进行加权，以产生几乎全球的基于观测的降水估计。为了产生一个完整的全球估计，数值模型的结果被用来填补数据空白的卫星测量仪组合估计。我们的顺序方法相结合的估计允许用户选择多卫星估计…
Abstract The “satellite-gauge-model” (SGM) technique is described for combining precipitation estimates from microwave satellite data, infrared satellite data, rain gauge analyses, and numerical weather prediction models into improved estimates of global precipitation. Throughout, monthly estimates on a 2.5° × 2.5° lat-long grid are employed. First, a multisatellite product is developed using a combination of low-orbit microwave and geosynchronous-orbit infrared data in the latitude range 40°N–40–S (the adjusted geosynchronous precipitation index) and low-orbit microwave data alone at higher latitudes. Then the rain gauge analysis is brought in, weighting each field by its inverse relative error variance to produce a nearly global, observationally based precipitation estimate. To produce a complete global estimate, the numerical model results are used to fill data voids in the combined satellite-gauge estimate. Our sequential approach to combining estimates allows a user to select the multisatellite estim...