Updated Jason-3 wind speed and SSB solutions (2D and 3D)

Ngan Tran (CLS, France)

CoAuthors

Doug Vandemark (UNH, USA); Hui Feng (UNH, USA); Fabrice Ardhuin (LOPS, France); Lotfi Aouf (Meteo-France, France); Sophie LeGac (CNES, France); Nicolas Picot (CNES, France)

Event: 2017 Ocean Surface Topography Science Team Meeting

Session: Instrument Processing: Propagation, Wind Speed and Sea State Bias

Presentation type: Type Poster

It is proposed to update the Jason-3 wind speed (WS) estimates by both applying a bias on MLE4 sigma0 (-0.16 dB) and using the Jason-2 based wind speed model [Tran, 2015] instead of the Jason-1 version [Collard, 2005]. In this case, the histogram characteristics (shape and mean value) are closer to those observed from ECMWF data.

The Sea State Bias (SSB) correction to sea surface height measurement is an empirical correction that is computed specifically for each altimeter. With the successful launch of the Jason-3 mission on January 2016, 1-year based solutions (2D and 3D) have been developed from collinear dataset. As reported, the differences between Jason-3 (MLE4, 2D, updated WS) with respectively 2015 Jason-1 and 2012 Jason-2 solutions display narrow distributions with standard deviation of about 3 mm and averaged differences of ~1 cm. Updated 3D SSB solution is also available and displays larger improvement (~0.8 cm²) in variance reduction at crossovers when one compares with the Jason-2 based version currently used to generate the GDR products.

These activities have been done within the SALP and Jason-3 PEACHI prototype projects.

 

Poster show times:

RoomStart DateEnd Date
Concerto Ballroom Thu, Oct 26 2017,14:00 Thu, Oct 26 2017,18:00
Ngan Tran
CLS
France
ntran@cls.fr