The Influences of TOVS Radiance Assimilation on Temperature and Moisture Tendencies in JRA-25 and ERA-40
The Influences of TOVS Radiance Assimilation on Temperature and Moisture Tendencies in JRA-25 and ERA-40
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DOI：
10.1175/2009jtecha1193.1
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发表时间：
2009-08
影响因子：
2.2
通讯作者：
M. Sakamoto;J. Christy
中科院分区：
文献类型：
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作者：
M. Sakamoto;J. Christy
日本于2006年利用40年ECMWF再分析（ERA-40）的综合观测数据完成了一项长期再分析（JRA-25）。JRA-25和ERA-40采用相同类型的同化系统：直接利用卫星探空辐射的3DVAR。对这两个再分析中的长期高空热趋势进行了检查，并与阿拉巴马大学亨茨维尔分校（UAH）和遥感系统（RSS）的观测深层温度进行了比较。再分析的高空温度趋势与UAH和RSS有显著差异，这似乎受到电视和红外观测卫星（TIROS）操作垂直测深仪（TOVS）观测方式的影响。本研究的重点是记录TOVS同化的问题，特别是在再分析中使用的偏差校正问题。参考再分析和原始TOVS观测之间偏差检验的定量结果，这…
Abstract A Japanese long-term reanalysis (JRA-25) was completed in 2006 utilizing the comprehensive set of observations from the 40-yr ECMWF Re-Analysis (ERA-40). JRA-25 and ERA-40 adopted the same type of assimilation systems: 3DVAR with direct use of satellite sounding radiances. Long-term upper-air thermal tendencies in both reanalyses are examined and compared with the observational deep-layer temperatures of the University of Alabama in Huntsville (UAH) and Remote Sensing Systems (RSS). The upper-air temperature tendencies in the reanalyses are significantly different from those of UAH and RSS, and they appear to be influenced by the way the observations of the Television and Infrared Observation Satellite (TIROS) Operational Vertical Sounder (TOVS) are used. This study focuses on documenting problems in TOVS assimilation, especially problems in bias corrections used in the reanalyses. Referring to quantitative results in an examination of biases between the reanalyses and raw TOVS observations, this...