First results of the TRMM Microwave Imager (TMI) monthly oceanic rain rate: comparison with SSM/I
First results of the TRMM Microwave Imager (TMI) monthly oceanic rain rate: comparison with SSM/I
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DOI：
10.1029/1998gl900452
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发表时间：
1999-08
影响因子：
5.2
通讯作者：
Alfred T. C. Chang;Long S. Chiu;C. Kummerow;J. Meng;T. Wilheit
中科院分区：
文献类型：
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作者：
Alfred T. C. Chang;Long S. Chiu;C. Kummerow;J. Meng;T. Wilheit
我们利用6个月（1998年1月至6月）的热带降雨测量任务（TRMM）微波成像仪（TMI）数据，评估了TMI发射时算法对月海洋雨率的性能。与特殊传感器微波成像仪（SSM/I）资料的海洋月雨率比较，差异有统计学意义。除降雨量低于1.4 mm/d外，TMI降雨率总体低于SSM/I降雨率约10%。低TMI偏差可能是由于估计的雨层厚度所显示的柱状水汽估计过高。TMI的优越采样性能改善了算法在低降雨率下的统计性能。40°S ~ 40°N纬度的月平均降雨量TMI和SSM/I分别为2.78和3.17 mm/d，均方根差为1.35 mm/d，相关系数为0.94。
We evaluated the performance of the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) at‐launch algorithm for monthly oceanic rain rate using six months (January–June 1998) of TMI data. Comparison with oceanic monthly rain rates derived from the Special Sensor Microwave Imager (SSM/I) data shows statistically significant differences. The TMI rain rates are lower than the SSM/I rain rates by about 10% overall, except for rain rates lower than 1.4 mm/day. The low TMI bias may be due to an overestimate of the columnar water vapor as indicated by the estimated rain layer thickness. The superior sampling by the TMI improves the algorithm statistics at the low rain rates. The averaged monthly rain rates over the latitudes between 40°S and 40°N are 2.78 and 3.17 mm/day, respectively for TMI and SSM/I, with RMS difference of 1.35 mm/day and correlation coefficient of 0.94.