First regional SMOS Sea Surface Salinity products over the Baltic Sea: quality assessment and oceanographic added-value

• Main Authors: González Gambau, Verónica, Olmedo, Estrella, González-Haro, Cristina, Turiel, Antonio, García Espriu, Aina, Gabarró, Carolina, Martínez, Justino, Alenius, Pekka, Tuomi, Laura, Roiha, Petra, Arias, Manuel, Catany, Rafael, Fernández-Prieto, Diego, Sabia, Roberto
• Format: Conference Object
• Language: English
• Published: European Geosciences Union 2021
• Subjects: Kattegat; The Narrows; North Atlantic
• Online Access: http://hdl.handle.net/10261/259360; https://doi.org/10.5194/egusphere-egu21-15254

European Geosciences Union (EGU) General Assembly, 19-30 Apr 2021.-- 2 pages The Baltic Sea is a strongly stratified semi-enclosed sea with a large freshwater supply from rivers, net precipitation and water exchange and high-saline water from the North Sea through the Kattegat Strait. In the Danish Straits the water exchange is hampered by bathymetric constraints , such as narrow and shallow sills, and by hydrodynamic restrictions, such as fronts and mixing. The shallow depth of the Baltic Sea (i.e. 54 m in average) yields to highly variable ocean dynamics controlled mainly by local atmospheric forcing. The water exchange between the Baltic Sea and the North Atlantic Ocean is restricted by the narrows and sills of the Danish Straits (i.e. via Kattergat Strait at the East of the Baltic Sea) and by different river outflows distributed across the Baltic Sea. The bottom water in the deep sub-basins is ventilated mainly by large perturbations, so-called major Baltic saltwater inflows. The occurrence of these events needs still further investigation. The description of the complex oceanographic conditions within the Baltic Sea in current model simulations could also be developed. Furthermore, model simulations of the Baltic Sea are constrained to the initialization of the model (i.e. parametrization of the initial surface atmospheric and ocean conditions). For this, the Earth Observation salinity measurements have a great potential to help in the understanding of the dynamics in the basin and to improve the regional models there. However, the Baltic Sea is one of the most challenging regions for the sea surface salinity (SSS) retrieval from satellite measurements. The available EO-based SSS products are quite limited over this region both in terms of spatio-temporal coverage and quality. This is mainly due to several technical limitations that strongly affect the satellite brightness temperatures (TB) measurements, particularly over semi-enclosed seas, such as the high contamination by Radio-Frequency Interferences ...