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首页> 外文期刊>Geophysical Research Letters >First results of the TRMM microwave imager (TMI) monthly oceanic rain rate: comparison with SSM/I
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First results of the TRMM microwave imager (TMI) monthly oceanic rain rate: comparison with SSM/I

机译:TRMM微波成像仪(TMI)月海洋降水率的初步结果:与SSM / I的比较

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摘要

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°N 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.
机译:我们使用六个月(1998年1月至1998年6月)的TMI数据评估了热带雨量测量任务(TRMM)微波成像仪(TMI)发射时每月海洋降雨率的性能。与特殊传感器微波成像仪(SSM / I)数据得出的海洋每月降雨率的比较显示出统计学上的显着差异。总体上,TMI降雨率比SSM / I降雨率低约10%,但每日降雨率低于1.4毫米。低的TMI偏差可能是由于柱状水蒸气的高估所致,如估计的雨层厚度所示。 TMI的出色采样功能改善了低降雨率时的算法统计。对于TMI和SSM / I,在40°N和40°N之间的纬度上,平均每月降雨率分别为2.78和3.17 mm / day,RMS差为1.35 mm / day,相关系数为0.94。

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