Day 4

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Paper title On the impact of SMOS and SMAP wind on the wave forecasting under cyclone conditions
  1. Lotfi Aouf Meteo France, CNRM Speaker
  2. Nicolas Reul IFREMER
  3. Alice Dalphinet Meteo France, CNRM
  4. Fabrice Collard OCEANDATALAB
  5. Herve Giordani CNRM (CNRS/Météo-France)
  6. Bertrand Chapron Ifremer - LOPS
Form of presentation Poster
  • A8. Ocean
    • A8.13 Remote-sensing of Ocean Winds and Stress
Abstract text Preventing of high sea state generated in cyclonic conditions is a continous challenge for operational meteorological centers in order to ensure the best wave forecast in open ocean and coastal areas. The accuracy of wind forcing in such extreme conditions is important for capturing the best initial conditions for swell propagation over long distance. Recently the winds from SMAP and SMOS L-band radiometers have shown their ability to observe strong winds that exceed 40 m/s as in cyclonic conditions (Reul et al 2012). The objective of this study is to assess the impact of using radiometers winds on wave forecasting during cyclone seasons in north Atlantic and Pacific ocean and Indian ocean. The work consists of implementing an hybrid wind forcing composed of radiometers winds and model winds. A deep learning techinque is performed to ensure consistent cyclogenesis conditions. Simulations of the wave model MFWAM have been developed for cyclones and hurricanes cases, which caused severe damages after their passage (Bejisa, Lorenzo 2019, Hagibis 2019, etc.). The validation of model results has been performed with altimeters wave data. The results show a positive impact on significant wave height with good reduction of bias and scatter index. We also point out the good consistency between model and Sentinel-1 wave spectra near the cyclone trajectories.
In this study by using 1D ocean mixed layer model we investigated the impact of improved wind forcing on ocean circulation and key parameters such as temperature, currents and surface stress. Further results and comments will be presented in the final paper.