| 摘要: |
| 为提高降雨条件下星载全极化微波辐射计海面风场精度，通过匹配WindSat海面风场和降雨率数据以及美国国家浮标中心浮标观测数据，得到18 996组匹配样本，深入分析了降雨对海面风场反演精度的严重影响，构建了风场校正模型。试验结果表明，降雨导致海面风速被严重高估，风向误差随着降雨率的增大而增大。校正后的风速精度在低风速段提升明显。无论降雨率多大，校正后风速精度均比校正前高。风速均方根误差由原来的2.9 m/s降低到了2.1 m/s，风向均方根误差由原来的26.9°降低到了26.3°。 |
| 关键词: 海洋水文学 降雨 全极化微波辐射计 海面风场 校正 |
| DOI：10.3969/J.ISSN.2095-4972.2023.01.011 |
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| 基金项目:中国博士后科学基金资助项目(2017M610971) |
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| Accuracy improvement of sea surface wind field for spaceborne fully polarimetric microwave radiometer under rainfall |
| JIANG Zhuhui,KONG Xiaojuan |
| (Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China;Beijing Institute of Applied Meteorology, Beijing 100029, China) |
| Abstract: |
| In order to improve the accuracy of sea surface wind fields retrieved by the spaceborne fully polarimetric microwave radiometer, a wind field correction model based on statistical algorithm was constructed. Firstly, the WindSat sea surface wind fields and rainfall products coupled with buoy data from the American national data buoy center ranging from 2003 to 2020 are evaluated with obtained 18 996 coupled samples. Then, the wind field correction model is trained to correct the WindSat wind field product. The results show that the wind speed under rainfall in WindSat product was severely overestimated. The wind direction error increases with the increase of rain rate. After applying the wind field correction model, the error of low wind speed decreases obviously. The corrected wind speed accuracy is much higher than that of the WindSat product, regardless of the rain rate. The wind speed error reduces from 2.9 m/s to 2.1 m/s, and the wind direction error reduces from 26.9° to 26.3°. |
| Key words: marine hydrology rainfall fully polarimetric microwave radiometer sea surface wind |
