| 遥感海表盐度分析产品的有效分辨率研究 |
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| 引用本文： | 陈建,程锐,刘娟,王辉赞,鲍森亮,闫恒乾.遥感海表盐度分析产品的有效分辨率研究[J].海洋学研究,2018,36(4):17-27. |
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| 作者姓名： | 陈建 程锐 刘娟 王辉赞 鲍森亮 闫恒乾 |
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| 作者单位： | 1.北京应用气象研究所 北京 100029;2.地理信息工程国家重点实验室,陕西 西安 710054;3.国防科技大学 气象海洋学院,湖南 长沙 410073 |
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| 基金项目： | 国家自然科学基金项目资助(41706021) |
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| 摘 要： | 针对SMOS和Aquarius海表盐度误差分析没有区分不同空间频谱信噪特征的问题,基于6种主要的遥感盐度分析产品,根据定性图像、纬向波数谱、均方根误差等指标,分析产品的有效分辨率并探讨其原因机制。研究表明:CATDS-0.25°分析产品所描述的盐度场中小尺度结构失真,其较高谱能量密度在热带海域以噪音为主,而在西边界流等海域以信号为主;BEC-L3-0.25°有着较小的均方根误差、清晰的盐度图像、显著的中尺度能量,最适于描绘中尺度(25~100 km)盐度特征;BEC-L4-0.25°被奇异谱分析方法过度平滑了盐度场;Aquarius-V2-1.00°通过局部平滑处理,在描述大尺度(＞100 km)盐度现象方面表现较好;Aquarius-CAP-1.00°通过主动-被动联合算法(CAP)减小了均方根误差,但图像中卫星轨道形态明显;CATDS-1.00°的图像形态、能量分布和误差特征与Aquarius-V2-1.00°相当。这些结论可为用户正确使用产品进行地球物理学研究提供参考。
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| 关 键 词： | SMOS Aquarius 海表盐度 遥感分析产品 有效分辨率 |
| 收稿时间： | 2018-05-03 |
Study on effective resolutions of remotely sensed reanalysis products of sea surface salinity |
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| CHEN Jian,CHENG Rui,LIU Juan,WANG Hui-zan,BAO Sen-liang,YAN Heng-qian.Study on effective resolutions of remotely sensed reanalysis products of sea surface salinity[J].Journal of Marine Sciences,2018,36(4):17-27. |
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| Authors: | CHEN Jian CHENG Rui LIU Juan WANG Hui-zan BAO Sen-liang YAN Heng-qian |
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| Institution: | 1. Beijing Institute of Applied Meteorology, Beijing 100029, China;2. State Key Laboratory of Geo-Information Engineering, Xi’an 710054, China;3. Institute of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | The effective resolutions of six remotely sensed reanalysis products of sea surface salinity(SSS) from the soil moisture and ocean salinity (SMOS) and Aquarius/SAC-D missions were studied, in terms of the qualitative map, zonal wavenumber spectra, and root mean square (RMS) error. The mechanisms behind their differences also are studied. It suggests that the CATDS-0.25° reanalysis is unable to capture the small-scale structures in SSS and performs the worst in representing spatial variability in SSS. Its higher spectral energy is mostly a reflection of noises in the tropics while those in regions such as along the western boundary flows are signals. The BEC-L3-0.25° reanalysis, which has small RMS errors, clear salinity maps, and remarkable mesoscale energy, is the best fit for portraying mesoscale (25-100 km) SSS features. The SSS in the BEC-L4-0.25° reanalysis is overly attenuated by its singularity analysis remapping method. The Aquarius-V2-1.00° reanalysis, with an additional smoothing procedure, performs well in depicting large-scale (＞100 km) salinity phenomena. The Aquarius-CAP-1.00° reanalysis generates the smallest RMS errors benefiting from its combined active-passive (CAP) algorithm, however, and leads to a somewhat noisy, artificial pattern with unreasonable along-track strips. The CATDS-1.00° reanalysis is roughly equivalent to the Aquarius-V2-1.00° in terms of pattern, energy, and error features. |
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| Keywords: | SMOS Aquarius sea surface salinity remotely sensed reanalysis product effective resolution |
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