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First results on wave spectral parameters from the CFOSAT satellite

Abstract : CFOSAT is a new satellite mission launched on October 29th, 2018. It is developed since 2006 thanks to a fruitful Chinese-French cooperation involving the French Space Agency CNES, the Chinese agencies CNSA and NSOAS, and scientific support from various research laboratories in France and China. CFOSAT will provide for the first time colocated and global observations on the surface ocean wind vector, and ocean wave spectral parameters (wave spectra and associated parameters) from a combination of two Ku-Band radar instruments (SWIM and SCAT) working in altimeter and wave spectrometer modes (SWIM) and wind scatterometer mode (SCAT). The CFOSAT products will offer the opportunity to develop new studies from global observations, such as joint analysis of space evolution of wind and waves, detailed analysis of the spectral properties of the wave field (in particular its directionality) and relationship between long waves (measured by SWIM) and short wave properties (indirect information from the normalized radar cross-section). The data will also be used in data assimilation schemes of wave and atmospheric numerical models (through assimilation) in order to improve wave and atmospheric forecast. The information on peak wavenumber, wave direction, directional spread for several wave spectrum partitions, will also be of great interest to study wave/current interactions and to feed the coastal studies with sea state boundary conditions. During this conference, less than six months after the launch, the first results on the products generated in near real-time by the CNES mission center will be presented. First the data processing principles of the SWIM data and the main products will be recalled. Then, a first assessment of the normalized radar cross-section at near-nadir incidence and of wave products (significant wave height, dominant direction and dominant wave length, for the whole spectra and separated by wave partitions) will be presented. This first assessment of the SWIM products relies on the work of a CAL/VAL team which carries out comparisons between CFOSAT data, satellite altimeter products, wave forecast model products (ECWAM, MFWAM, WW3), in situ data, and other satellite data (such a Sentinel-1 wave mode data).
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https://hal-insu.archives-ouvertes.fr/insu-02327199
Contributor : Catherine Cardon <>
Submitted on : Tuesday, October 22, 2019 - 5:18:24 PM
Last modification on : Friday, January 10, 2020 - 3:42:35 PM

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  • HAL Id : insu-02327199, version 1

Citation

Danièle Hauser, L. Aouf, Mamadou Camara, A. Dalphinet, Lauriane Delaye, et al.. First results on wave spectral parameters from the CFOSAT satellite. Living Planet Symposium, ESA, May 2019, Milan, Italy. ⟨insu-02327199⟩

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