Abstract's details

5Hz resolution altimetry wave products for better coastal approach

Annabelle Ollivier (CLS, France)


Adrien Nigou (Celad for CLS, France); Isabelle Pujol (cls, France); Gerald Dibarboure (cnes, France); Alice Dalphinet (MeteoFrance, France); Francois Soulat (cls, France); Alejandro Bohe (cnes, France); Fanny Piras (cls, France); Ngan Tran (cls, France); Fabrice Ardhuin (LOPS, France)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Application development for Operations

Presentation type: Type Oral

CMEMS Wave TAC next baseline will be 5Hz resolution wave products, 1km along track, to answer to the users community who wants to get closer to the shore. Therefore, in the Sea State community, the literature usually assumes that altimetry waves at 1Hz is dominated by noise (Ardhuin et al. 2019) and most studies tackle this issue by filtering these data up to 50km at least (Quilfen et al. 2018, Dodet et al. 2020). It is also known that the fading noise has a real impact on correlated errors at these scales (Quartly et al. 2019), with an impact on SLA estimates that can empirically be reduced by methods described in Zaron et al. or Tran et al. 2021.
Is this presentation, we present 5Hz demonstration products, processed from 20Hz data with a particular care to data selection, an essential step for validation purpose (Quartly et al. 2019) and compression.
Their quality over coastal areas is illustrated and demonstrated with respect to the current baseline at 1Hz benchmarked and produced by CCI Sea Sate project (Dodet at al. 2021) and CMEMS operational NRT products.
Their high frequency contain is also deeply analyzed as well as the contamination effects on SLA estimates, mainly in the bump frequency, extensively described in Dibarboure et al 2014.
The results are presented for Jason3, Envisat, LRM missions processed with the innovative adaptive retracking (Tourain et al. 2021), Doppler SAR altimetry observations, (Moreau et al. 2021) and CFOSAT data dedicated to sea state observations (Hauser et al. 2020).
These products are finally proposed to other international teams (for assimilation and/or validation, climate or coastal communities…) via demonstration samples available on Aviso web site.
Give them a try!

Oral presentation show times:

Room Start Date End Date
Sala Pasinetti Wed, Nov 02 2022,09:45 Wed, Nov 02 2022,10:00
Annabelle Ollivier