Verification of TMI-Adjusted Rainfall Analyses of Tropical Cyclones at ECMWF Using TRMM Precipitation Radar
Verification of TMI-Adjusted Rainfall Analyses of Tropical Cyclones at ECMWF Using TRMM Precipitation Radar
复制标题
使用 TRMM 降水雷达验证 ECMWF 热带气旋的 TMI 调整降雨分析
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
V. Venugopal
中科院分区：
文献类型：
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作者：
A. Benedetti;P. Lopez;E. Moreau;P. Bauer;V. Venugopal
摘要本文介绍了利用星载雷达资料对热带气旋的被动微波调整降水分析的验证。这项工作是欧洲中期天气预报中心正在进行的一维加四维变分（1D+4D-Var）降雨同化项目的一部分。热带降雨测量使命（TRMM）卫星的亮度温度或地面降雨率处理通过一维变分率检索得到的总柱水汽值，可以摄取到业务ECMWF四维变分率。作为一种间接的验证，在1D-Var最小化过程结束时产生的降水场被转换成等效雷达反射率在TRMM降水雷达的频率（13.8 GHz），并与平均模型分辨率的观测值进行比较。平均过程中使用一个复杂的尺度缩小/放大的方法，是基于小波分解进行验证。沉淀物…
Abstract A validation of passive microwave–adjusted rainfall analyses of tropical cyclones using spaceborne radar data is presented. This effort is part of the one-dimensional plus four-dimensional variational (1D+4D-Var) rain assimilation project that is being carried out at the European Centre for Medium-Range Weather Forecasts (ECMWF). Brightness temperatures or surface rain rates from the Tropical Rainfall Measuring Mission (TRMM) satellite are processed through a 1D-Var retrieval to derive values of total column water vapor that can be ingested into the operational ECMWF 4D-Var. As an indirect validation, the precipitation fields produced at the end of the 1D-Var minimization process are converted into equivalent radar reflectivity at the frequency of the TRMM precipitation radar (13.8 GHz) and are compared with the observations averaged at model resolution. The averaging process is validated using a sophisticated downscaling/upscaling approach that is based on wavelet decomposition. The precipitatio...