Abstract's details

Global Ocean Data Quality Assessment of SARAL/AltiKa‘s GDR-F products

Jettou Ghita (CLS, France)


Manon Rousseau (ALTEN, France); Nadege Queruel (CNES, France); Françoise Bignalet-Cazalet (CNES, France); Nicolas Picot (CNES, France); Pierre Prandi (CLS, France)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Regional and Global CAL/VAL for Assembling a Climate Data Record

Presentation type: Type Poster

Contribution: PDF file


The SARAL mission was successfully launched on February 25th 2013. Its Ka-band altimeter and dual frequency radiometer have been delivering high quality sea surface topography measurements since. On July 4th, 2016 an orbit maneuver was performed to move the spacecraft to a new orbit where the satellite altitude is no longer maintained, starting the so-called drifting phase. Following the loss of the platform’s reaction wheels on September 13th 2014 and star tracker on February 3rd 2019, the pointing accuracy is degraded from 2019 onwards.

We present the current mission performance status of the SARAL/AltiKa mission over ocean, based on the analysis of the latest GDR version data (GDR-F) and for different temporal and spatial scales: long term evolution, mesoscales, coastal areas, high latitudes...

The main objective of this study is to assess quality of the SARAL/AltiKa's product over the whole series. Several Cal/Val metrics are presented to document data availability and overall mission performance. Comparisons with the previous GDR-T data version are used to highlight the benefits of the new GDR-F standard. Cross-comparisons with other altimetry missions (e.g. Jason-2, Jason-3) show the still excellent performance of SARAL/AltiKa.

Poster show times:

Room Start Date End Date
Mezzanine Tue, Nov 01 2022,17:15 Tue, Nov 01 2022,18:15
Mezzanine Thu, Nov 03 2022,14:00 Thu, Nov 03 2022,15:45
Jettou Ghita