Luciana Fenoglio-Marc¹, Joanna Staneva², Salvatore Dinardo³, Juergen Kusche⁴, Jérôme Benveniste⁵ and Bernd Uebbing¹, (1)University of Bonn, Bonn, Germany, (2)Helmholtz-Zentrum Geesthacht, Institute of Coastal Research, Geesthacht, Germany, (3)HeSpace, Darmstadt, Germany, (4)Bonn Umiversity, Bonn, Germany, (5)European Space Agency (ESA-ESRIN), Earth Observation Programmes, Frascati, Italy