卫星遥感中风场对降雨飘移距离的影响及误差校正

钱程程; 陈戈

doi:10.11834/jrs.20110222

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卫星遥感中风场对降雨飘移距离的影响及误差校正
Impact analysis and error correction of wind induced rain drift in satellite remote sensing measurement
2011年15卷第5期页码：1079-1091
纸质出版：2011
DOI： 10.11834/jrs.20110222
稿件说明：

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[1]钱程程,陈戈.卫星遥感中风场对降雨飘移距离的影响及误差校正[J].遥感学报,2011,15(05):1079-1091. DOI： 10.11834/jrs.20110222.

Impact analysis and error correction of wind induced rain drift in satellite remote sensing measurement[J]. Journal of Remote Sensing, 2011, 15(5): 1079-1091. DOI： 10.11834/jrs.20110222.

摘要

首先利用海表面风速与高度的对数关系、风向与高度的关系

推算出高空的风速、风向及相应风力的大小。在此基础上根据降雨的形成高度

假定在海表面10 m处风速为10 m/s的情况下

得到单位质量为1的雨水在风场影响下的飘移距离在3—100 km之间

可以判定这个偏移距离即为在风场影响下卫星观测降雨的误差。利用上述方法对10组TRMM卫星降雨产品数据进行纠正

将纠正前后的TRMM数据与GPCP数据进行对比。结果显示

经过纠正的TRMM数据与GPCP数据更为一致

整体精度提高了12%左右

验证了方法的正确性。

Abstract

The wind speed

wind direction and wind stress over the ocean with respect to altitude are derived based on empirical relations.Taking into account the height of rain formation and assuming that wind speed at 10 m is 10 m/s

wind induced spatial drift for a unit mass of rain cell is estimated to range from 3—100 km

which is considered as the error of mislocation in satellite precipitation measurement.This source of error is analyzed and corrected using 10 sets of rain data from TRMM satellite.Comparison with simultaneous GPCP data shows an overall improvement of 12% in their consistency

suggesting that the proposed correction scheme is both feasible and effective.