THE PROJECT'S OBJECTIVE IS TO IMPROVE THE RETRIEVAL ALGORITHM OF SATELLITE SEA SURFACE SALINITY (SSS) PRODUCTS THOUGH IMPROVED RADIATIVE TRANSFER MODEL AND SENSORS CALIBRATION. THE RETRIEVAL ALGORITHMS FOR SMAP AND AQUARIUS WILL BE ASSESSED BY COMPARISON WITH IN SITU SALINITY MEASUREMENTS AND SSS FROM A NUMERICAL OCEAN GENERAL CIRCULATION MODEL. THE RADIATIVE TRANSFER MODEL AND THE SENSORS' CALIBRATION WILL BE MODIFIED IN ORDER TO IMPROVE THE ACCURACY OF THE SSS RETRIEVAL. A FEW OF THE ISSUES TO BE ADDRESSED INCLUDE THE MODEL FOR THE DIELECTRIC CONSTANT OF SEA WATER THE UNCERTAINTY OF THE ANCILLARY SEA SURFACE TEMPERATURE CORRECTING FOR THE IMPACT OF SEA ICE IN THE HIGH LATITUDES AND THE IMPACT OF SEASONAL CYCLES ON THE AQUARIUS RADIOMETER CALIBRATION. THESE TOPICS ARE EXAMPLES BASED ON WHAT IS KNOWN AT THE TIME OF WRITING AND MAY CHANGE AS THE CALIBRATION AND SALINITY RETRIEVAL OF AQUARIUS AND SMAP IMPROVE.