4.7 Article

Enhancing Spatial Resolution of Sea Surface Salinity in Estuarine Regions by Combining Microwave and Ocean Color Satellite Data

期刊

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2021.3126399

关键词

Sea measurements; Sea surface; Ocean temperature; Salinity (geophysical); Surface roughness; Spatial resolution; Satellite broadcasting; Downscaling algorithm; sea surface salinity (SSS); spatial resolution

资金

  1. National Key Research and Development Program of China [2017YFA0603003]
  2. National Natural Science Foundation of China [41825014]
  3. Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory, (Guangzhou) [GML2019ZD0602]
  4. Zhejiang Provincial Natural Science Foundation of China [2017R52001]
  5. Zhejiang Talent Program [LR18D060001]

向作者/读者索取更多资源

This study proposes an approach to improve the spatial resolution of sea surface salinity (SSS) in estuarine areas through the combination of microwave and ocean color data. The model establishes a relationship between SSS and normalized sea surface emissivity and colored dissolved organic matter (CDOM), which is validated through in situ measurements. The results show enhanced SSS at high resolution compared to low resolution, improving the accuracy of satellite SSS observations over estuarine areas.
In this letter, we propose a downscaling approach to improve the spatial resolution of sea surface salinity (SSS) in estuarine areas using combined microwave and ocean color data. The model established a relationship between SSS and normalized sea surface emissivity and colored dissolved organic matter (CDOM). The model was validated by in situ measurements conducted in the East China Sea (ECS) and Mississippi River Estuary (MRE). The model showed relatively good agreement with in situ SSS measurements and illustrated enhanced SSS at high (4 km) resolution compared with low (40 km) resolution, with root mean square errors (RMSEs) of 1.55 versus 2.58 psu in the ECS and 0.39 versus 1.49 psu in the MRE. Overall, the proposed downscaling approach enhances the spatial resolution and accuracy of satellite SSS observations over estuarine areas, which should be helpful for ocean dynamic and biogeochemical studies in these regions.

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