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Ocean Surface Topography from Space
Global and regional altimetry CAL/VAL and science


Marc Naeije - (Delft University of Technology (TUDelft))

  Eelco Doornbos
Ernst Schrama
Pieter Visser
Wouter van de Wal
(Delft University of Technology (TUDelft))
(Delft University of Technology (TUDelft))
(Delft University of Technology (TUDelft))
(Delft University of Technology (TUDelft))

Global and regional altimetry CAL/VAL and science
CryoSat-2 sea level anomalies after "RADS" treatment: Left panel shows direct difference with Envisat anomalies and right panel the mesoscale variability over 6 months. There are no systematic errors remaining and the anomalies show the mesoscale ocean dynamics. Also the variability looks real already after 6 months worth of data.

This proposal lists the research on ocean surface topography implemented at the Delft institute for Earth-Oriented Space research (DEOS) focussing on CAL/VAL activities related to altimetric and gravimetric observations. This is an on-going activity at the institute and elaborates previous granted P.I. proposals for calibrating, validating, studying and applying data from all to date altimeter missions, now also including the upcoming JASON-3 mission. Main topics include a) the maintenance, development and service of the Radar Altimeter Database System (RADS), b) the related altimeter calibration and validation issues and orbit accuracy assessment and improvement, c) the scientific use in multidisciplinary studies, combining altimetry with gravity data to improve circulation models, address water and ice mass changes, improve ocean tidal modelling, and enhance mesoscale variability, and d) the long-term global, regional and local sea level variation using a mix of altimetry and other information sources like GNSS, InSAR and tide gauges. Connected to the work for RADS we address preparation for new altimeter missions and concepts like Ka-band altimetry from Altika, SAR altimetry from Jason-CS and Sentinel-3, GNSS reflectometry, and SWOT wide swath altimetry. Connected to CAL/VAL we also address sampling issues and strategies to optimally combine the available altimetry and participate in discussions on future altimeter constellations.

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