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Title

Seven Years of SMOS Sea Surface Salinity at High Latitudes: Variability in Arctic and Sub-Arctic Regions

AuthorsOlmedo, Estrella ; Gabarró, Carolina ; González, Verónica ; Martínez, Justino ; Ballabrera-Poy, Joaquim ; Turiel, Antonio ; Portabella, Marcos ; Fournier, Severine; Lee, Tong
KeywordsRemote sensing
Quality assessment
Data processing
Arctic rivers
SMOS
Arctic ocean
Sea surface salinity
Issue DateNov-2018
PublisherMultidisciplinary Digital Publishing Institute
CitationRemote Sensing 10(11): 1772 (2018)
AbstractThis paper aims to present and assess the quality of seven years (2011–2017) of 25 km nine-day Soil Moisture and Ocean Salinity (SMOS) Sea Surface Salinity (SSS) objectively analyzed maps in the Arctic and sub-Arctic oceans ( 50∘ N– 90∘ N). The SMOS SSS maps presented in this work are an improved version of the preliminary three-year dataset generated and freely distributed by the Barcelona Expert Center. In this new version, a time-dependent bias correction has been applied to mitigate the seasonal bias that affected the previous SSS maps. An extensive database of in situ data (Argo floats and thermosalinograph measurements) has been used for assessing the accuracy of this product. The standard deviation of the difference between the new SMOS SSS maps and Argo SSS ranges from 0.25 and 0.35. The major features of the inter-annual SSS variations observed by the thermosalinographs are also captured by the SMOS SSS maps. However, the validation in some regions of the Arctic Ocean has not been feasible because of the lack of in situ data. In those regions, qualitative comparisons with SSS provided by models and the remotely sensed SSS provided by Aquarius and SMAP have been performed. Despite the differences between SMOS and SMAP, both datasets show consistent SSS variations with respect to the model and the river discharge in situ data, but present a larger dynamic range than that of the model. This result suggests that, in those regions, the use of the remotely sensed SSS may help to improve the models
Description24 pages, 15 figures, 3 tables
Publisher version (URL)https://dx.doi.org/10.3390/rs10111772
URIhttp://hdl.handle.net/10261/172804
Identifiersdoi: 10.3390/rs10111772
issn: 2072-4292
e-issn: 2072-4292
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