Abstract's details

Validation of a large data set of SARAL water levels in the Amazon basin

Taina CONCHY (CESTU / UEA, Brazil)


Joecila SANTOS da SILVA (CESTU / UEA, Brazil); stephane CALMANT (IRD / LEGOS, France); Daniel MOREIRA (CPRM, Brazil)

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

Contribution: not provided


In 2010, SIlva et al. presented the largest validation of ERS-2 and ENVISAT water levels ever published, in the Amazon basin.
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

Poster show times:

Room Start Date End Date
Concerto Ballroom Thu, Oct 26 2017,14:00 Thu, Oct 26 2017,18:00