1 MARUM - Center for Marine and Environmental Sciences, University of Bremen, Klagenfurterstraße 2-4, 28359, Bremen, Germany. ddevleeschouwer@marum.de.
2 MARUM - Center for Marine and Environmental Sciences, University of Bremen, Klagenfurterstraße 2-4, 28359, Bremen, Germany.
3 Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK.
4 Research Group for Earth Observation, Pädagogische Hochschule Heidelberg, Czernyring 22/10-12, 69120, Heidelberg, Germany.