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한국지구과학회
The Korean Earth Science Society

pISSN : 1225-6692  |  eISSN : 2287-4518



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kess64, vol. 41, no. 4, pp.356-366, August, 2020

DOI. https://doi.org/10.5467/JKESS.2020.41.4.356

Accuracy and Error Characteristics of SMOS Sea Surface Salinity in the Seas around Korea

Kyung-Ae Park1,2,* , Jae-Jin Park3
1,Department of Earth Science Education, Seoul National University, Seoul 08826, Korea 2, Research Institute of Oceanography, Seoul National University, Seoul 08826, Korea 3, Department of Science Education, Seoul National University, Seoul 08826, Korea

Abstract

The accuracy of satellite-observed sea surface salinity (SSS) was evaluated in comparison with in-situ salinity measurements from ARGO floats and buoys in the seas around the Korean Peninsula, the northwest Pacific, and the global ocean. Differences in satellite SSS and in-situ measurements (SSS errors) indicated characteristic dependences on geolocation, sea surface temperature (SST), and other oceanic and atmospheric conditions. Overall, the root-mean-square (rms) errors of non-averaged SMOS SSSs ranged from approximately 0.8-1.08 psu for each in-situ salinity dataset consisting of ARGO measurements and non-ARGO data from CTD and buoy measurements in both local seas and the ocean. All SMOS SSSs exhibited characteristic negative bias errors at a range of ?0.50- ?0.10 psu in the global ocean and the northwest Pacific, respectively. Both rms and bias errors increased to 1.07 psu and ?0.17 psu, respectively, in the East Sea. An analysis of the SSS errors indicated dependence on the latitude, SST, and wind speed. The differences of SMOS-derived SSSs from in-situ salinity data tended to be amplified at high latitudes (40-60oN) and high sea water salinity. Wind speeds contributed to the underestimation of SMOS salinity with negative bias compared with in-situ salinity measurements. Continuous and extensive validation of satellite-observed salinity in the local seas around Korea should be further investigated for proper use.

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