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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。
Firstly, using the logarithm of the wind speed and altitude on the sea surface, the relationship between the wind direction and altitude, the wind speed, wind direction and the corresponding wind force at high altitude are deduced. On this basis, according to the formation height of rainfall, assuming that the wind speed at 10 m / s at sea surface is 10 m / s, the drift distance of rainwater with unit mass of 1 under the influence of wind field is between 3-100 km, It can be judged that this offset distance is the error of satellite observation rainfall under the influence of wind field. Ten data sets of TRMM satellite rainfall products were corrected by the above method, and the TRMM data before and after the correction were compared with the GPCP data. The results show that the corrected TRMM data is more consistent with the GPCP data, and the overall accuracy is improved by about 12%, which proves the correctness of the method.