Combined wave and wind products based on CFOSAT multi-instrument observations

Alexey Mironov (OceanDataLab, France)

CoAuthors

Yves Quilfen (LOPS, IFREMER, France); Jean-Francois Piolle (LOPS, IFREMER, France); Gilles Guitton (OceanDataLab, France); Fabrice Collard (OceanDataLab, France); Antoine Grouazel (LOPS, IFREMER, France); Frederic Nouguier (LOPS, IFREMER, France); Alexis Mouche (LOPS, IFREMER, France); Bertrand Chapron (LOPS, IFREMER, France)

Event: 2019 Ocean Surface Topography Science Team Meeting

Session: CFOSAT

Presentation type: Type Poster

The CFOSAT is the innovative space mission dedicated to the observation of the ocean sea state and the sea surface winds. Recently launched in October 2018, CFOSAT operates two Ku-band rotating radars: the nadir and near-nadir Ku-band wave scatterometer (SWIM) and the dual-polarization, moderate incidence angle, Ku-band wind scatterometer (SCAT). This unique configuration of two sensors operating at two different incidence angle ranges provides regular measurements of sea state parameters, including directional wave spectrum, together with simultaneous wind speed and direction. From timely collocated wave and wind measurements, each single instrument data by its own can benefit from the other one. Such multi-modal observations require to develop new methods and approaches to realize the full expected potential of the mission.
IFREMER and OceanDataLab in cooperation with CNES implement and operate Wind and Wave Operation Center (IWWOC) dedicated to analysis and processing of combined observations from SWIM and SCAT sensors. It will process, archive and disseminate to the ocean user community delayed mode products from level 2 to level 4. Particularly, combined Level 2 (L2S) products are aimed to provide a consistent and homogeneous time series of wave and wind data through reprocessing activities.
In the L2S SWIM, one of the main objectives is to handle complex cases (heterogeneous seas and coastal areas) using ancillary data and alternative methodologies. This is an opportunity to revisit common wave inversion tasks spatial and spectral processing, computation of the modulation transfer function and partitioning.
The benefit of the synergistic approach will be demonstrated in application to SCAT wind vector retrieval which is improved by using SWIM nadir observations (L2S SCAT). The standard scatterometer wind vector inversion procedure based on the Maximum Likelihood Estimator (MLE) is extended to accommodate the SWIM collocated measurements.
The application of combined L2S products wiil be shown during the conference on the example of the analysis of selected use cases related to different oceanographic tasks.
 

Poster show times:

Room Start Date End Date
The Gallery Tue, Oct 22 2019,16:15 Tue, Oct 22 2019,18:00
The Gallery Thu, Oct 24 2019,14:00 Thu, Oct 24 2019,15:45
Alexey Mironov
OceanDataLab
France
alexey.s.mironov@gmail.com