| Summary: | Living Planet Symposium, 23-27 May 2022, Bonn, Germany The dynamics of the Sea Ice affects the global Earth system. Changes in polar climate have an impact across the world, affecting lives and livelihoods, and regulating the climate and the weather. CRiceS (Climate relevant interactions and feedback: the key role of sea ice and snow in the polar and global climate system) is a recent European project aiming at understanding the role of ocean-ice/snow-atmosphere interactions in polar and global climate. The main objective of CRiceS is to deliver improved understanding of the physical, chemical, and biogeochemical interactions within the Ocean/Ice/Atmosphere system, new knowledge of polar and global climate, and enhanced ability of society to respond to climate change. One of the variables that plays a key role for a better understanding of the ocean/Ice/atmosphere dynamics is Sea Surface Salinity (SSS). SSS allows monitoring changes in sea ice by means of the study of their positive anomalies (associated to sea ice formation and evaporation) and negative anomalies (associated with melting and precipitation). The acquisition of in situ salinity measurements in polar regions is very complicated because of the distance and the extreme weather conditions. Therefore, measurements acquired by satellites become the unique way of having a continuous and synoptic monitoring of the sea surface salinity in polar regions. Acquisitions of L-band satellite SSS in polar regions, and particularly those by ESA SMOS mission, are hampered by the decrease of sensitivity of brightness temperatures to SSS in cold waters. Recently, these difficulties have been overcome in a dedicated project from ESA (Arctic+ Salinity) over the Arctic Ocean, leading to satellite SSS measurements with enough quality to address many scientific studies. However, in the Southern Ocean, since the salinity variability is not as large as in the Arctic Ocean, current quality of L-band brightness temperatures does not always allow assessing the seasonal and ...
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