A New Platform for the Determination of Air–Sea Fluxes (OCARINA): Overview and First Results

Type Article
Date 2014-05
Language English
Author(s) Bourras D.1, Branger H.2, Reverdin Gilles3, Marie Louis4, Cambra R.1, Baggio L.1, Caudoux C.1, Caudal G.1, Morisset S.3, Geyskens N.5, Weill Alain1, Hauser D.1
Affiliation(s) 1 : LATMOS, F-78280 Guyancourt, France.
2 : Aix Marseille Univ, CNRS, Marseille, France.
3 : LOCEAN, Paris, France.
4 : IFREMER, LPO, Plouzane, France.
5 : INSU, Div Tech, Meudon, France.
Source Journal Of Atmospheric And Oceanic Technology (0739-0572) (Amer Meteorological Soc), 2014-05 , Vol. 31 , N. 5 , P. 1043-1062
DOI 10.1175/JTECH-D-13-00055.1
WOS© Times Cited 6
Keyword(s) In situ atmospheric observations, Surface observations, In situ oceanic observations
Abstract The present paper describes a new type of floating platform that was specifically designed for estimating air–sea fluxes, investigating turbulence characteristics in the atmospheric surface boundary layer, and studying wind–wave interactions. With its design, it can be deployed in the open ocean or in shallow-water areas. The system is designed to be used from a research vessel. It can operate for ~10 h as a drifting wave rider and 3 h under power. Turbulence and meteorological instrument packages are placed at a low altitude (1–1.5 m). It was deployed for validation purposes during the Front de Marée, Variabilité (FROMVAR), 2011 experiment off the west coast of Brittany, France. Wind friction velocity and surface turbulent buoyancy flux were estimated using eddy covariance, spectral, bulk, and profile methods. The comparisons of the four methods show a reasonable agreement except for the spectral buoyancy flux. This suggests that the platform design is correct. Also, the wind measured at a fixed height above the sea shows spectral coherence with wave heights, such that wind and swell are in phase, with the largest wind values on top of swell crests. This result in qualitative agreement with current model predictions supports the capability of the Ocean Coupled to Atmosphere, Research at the Interface with a Novel Autonomous platform (OCARINA) to investigate wind–swell interactions.
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Bourras D., Branger H., Reverdin Gilles, Marie Louis, Cambra R., Baggio L., Caudoux C., Caudal G., Morisset S., Geyskens N., Weill Alain, Hauser D. (2014). A New Platform for the Determination of Air–Sea Fluxes (OCARINA): Overview and First Results. Journal Of Atmospheric And Oceanic Technology, 31(5), 1043-1062. Publisher's official version : https://doi.org/10.1175/JTECH-D-13-00055.1 , Open Access version : https://archimer.ifremer.fr/doc/00192/30283/