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Clear-Sky Turbulence and Shallow Convection: New Insights Combining SAR Images, Satellite Brightness Temperature and In Situ Measurements
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  • Pierre-Etienne Brilouet,
  • Dominique Bouniol,
  • Fleur Couvreux,
  • Alex Ayet,
  • Carlos Granero-Belinchon,
  • Marie Lothon,
  • Alexis Aurélien Mouche
Pierre-Etienne Brilouet
Centre National de Recherches Météorologiques

Corresponding Author:[email protected]

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Dominique Bouniol
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Fleur Couvreux
Université Toulouse, CNRM, Meteo-France, CNRS
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Alex Ayet
Ifremer/ Lmd
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Carlos Granero-Belinchon
IMT Atlantique, Lab-STICC, UMR CNRS 6285
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Marie Lothon
Universite de Toulouse, CNRS
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Alexis Aurélien Mouche
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The imprint of marine atmospheric boundary layer (MABL) dynamical structures on sea surface roughness, as seen from Sentinel-1 Synthetic Aperture Radar (SAR) acquisitions, is investigated. We focus on February 13th, 2020, a case study of the EUREC4A (Elucidating the role of clouds-circulation coupling in climate) field campaign. For clear sky conditions, convective rolls and cells imprints on sea surface roughness is confirmed through the intercomparison with MABL turbulent organization deduced from airborne measurements. A discretization of the SAR wide swath into 25 x 25 km$^2$ tiles allows us to capture the spatial variability of the turbulence organization varying from rolls to cells. We then objectively detect cold pools within the SAR image and combine them with geostationary brightness temperature. The geometrical or physically-based metrics of cold pools are correlated to cloud properties. This provides a promising methodology to analyze the dynamics of convective systems as seen from below and above.