Validation of a large data set of SARAL water levels in the Amazon basin
Event: 2017 Ocean Surface Topography Science Team Meeting
Session: Science IV: 25 years of satellite altimetry for Cryosphere and Hydrology: from experimental to emerging operational applications
Presentation type: Type Poster
Since SARAL has been orbiting for 3 years the same 35 day repeat orbit than ERS-2 and ENVISAT, we performed the same analysis of SARAL series as Silva et al. did for ERS-2 and ENVISAT. The analysis was performed for the ICE-1 retracking, available in the SARAL GDRs and similar to the one used by Silva et al. (2010)
Then, we estimated :
- the RMS difference with in-situ gauges;
- the absolute bias since the gauges are levelled with GPS
- a revision of the ENVISAT absolute bias based on this new -and larger- dataset of levelled gauges.
- the relative bias between ENVISAT and SARAL. Such a bais is required to append SARAL series after the ENVISAT series.
Silva et al. (2010); RSE, doi:10.1016/j.rse.2010.04.020