| Ai Weihua,Feng Mengyan,Chen Guanyu,Lu Wen.Research on sea surface temperature retrieval by the one-dimensional synthetic aperture microwave radiometer, 1D-SAMR[J].Acta Oceanologica Sinica,2020,42(5):115-122 |
| 基于一维综合孔径微波辐射计的海面温度反演研究 |
| Research on sea surface temperature retrieval by the one-dimensional synthetic aperture microwave radiometer, 1D-SAMR |
| 投稿时间：2019-03-19 |
| DOI：10.1007/s13131-020-1540-1 |
| 中文关键词: 海面温度 综合孔径微波辐射计 反演精度 定标精度 辅助参数误差 高空间分辨率 |
| 英文关键词:sea surface temperature synthetic aperture microwave radiometer retrieval accuracy radiometer calibration accuracy auxiliary parameter errors high spatial resolution |
| 基金项目: |
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| 中文摘要: |
| 针对实孔径微波辐射计遥感海面温度空间分辨率低的缺点，本文采用一维综合孔径微波辐射计开展海面温度反演研究。根据仿真结果，辐射计的空间角分辨率可以达到0.43°。基于模拟观测亮温和模式亮温构建代价函数，通过代价函数最小化的迭代方法反演海面温度。结果表明：影响海面温度反演精度的主要因素是辐射计定标精度和辅助参数的精度，不考虑辅助参数误差时，海面温度反演误差在低温场景下最大，对于0.5K的辐射计定标精度，35°入射角下的误差为0.7106K；考虑辅助参数误差时，高风速场景下的海面温度反演误差最大，对于0.5K的辐射计定标精度，入射角为65°且海面风速误差为1.0m/s时，海面温度反演误差为1.3305 K。 |
| 英文摘要: |
| Due to the low spatial resolution of sea surface temperature (TS) retrieval by real aperture microwave radiometers, in this study, an iterative retrieval method that minimizes the differences between brightness temperature (TB) measured and modeled was used to retrieve sea surface temperature with a one-dimensional synthetic aperture microwave radiometer, temporarily named 1D-SAMR. Regarding the configuration of the radiometer, an angular resolution of 0.43° was reached by theoretical calculation. Experiments on sea surface temperature retrieval were carried out with ideal parameters; the results show that the main factors affecting the retrieval accuracy of sea surface temperature are the accuracy of radiometer calibration and the precision of auxiliary geophysical parameters. In the case of no auxiliary parameter errors, the greatest error in retrieved sea surface temperature is obtained at low TS scene (i.e., 0.710 6 K for the incidence angle of 35° under the radiometer calibration accuracy of 0.5 K). While errors on auxiliary parameters are assumed to follow a Gaussian distribution, the greatest error on retrieved sea surface temperature was 1.330 5 K at an incidence angle of 65° in poorly known sea surface wind speed (W) (the error on W of 1.0 m/s) over high W scene, for the radiometer calibration accuracy of 0.5 K. |
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