Bourras D. auteur aut IRD Cambra R. auteur aut IRD Marié L. auteur aut IRD Bouin M.N. auteur aut IRD Baggio L. auteur aut IRD Branger H. auteur aut IRD Beghoura G. auteur aut IRD Reverdin G. auteur aut IRD Dewitte Boris auteur aut IRD Paulmier Aurélien auteur aut IRD Maes Christophe auteur aut IRD Ardhuin F. auteur aut IRD Pairaud I. auteur aut IRD Fraunié P. auteur aut IRD Luneau C. auteur aut IRD Hauser D. auteur aut IRD text journalArticle eng text/pdf born digital access Turbulent fluxes at the air-sea interface are estimated with data collected in 2011 to 2017 with a low-profile platform during six experiments in four regions. The observations were carried out with moderate winds (2-10 m/s) and averaged wave heights of 1.5 m. Most of the time, there was a swell, with an averaged wave age (the ratio between wave phase speed and wind speed) being equal to 2.8 ± 1.6. Three flux calculation methods are used, namely, the eddy covariance (EC), the inertial dissipation (ID), and the bulk methods. For the EC method, a spectral technique is proposed to correct wind data from platform motion. A mean bias affecting the friction velocity (u*) is then evaluated. The comparison between EC u* and ID u* estimates suggests that a constant imbalance term (ϕimb) equal to 0.4 is required in the ID method, possibly due to wave influence on our data. Overall, the confidence in the calculated u* estimates is found to be on the order of 10%. The values of the drag coefficient (CD) are in good agreement with the parameterizations of Smith (1988, https://doi.org/10.1029/JC093iC12p15467) in medium-range winds and of Edson et al. (2013, https://doi.org/10.1175/JPO-D-12-0173.1) in light winds. According to our data, the inverse wave age varies linearly with wind speed, as in Edson et al. (2013, https://doi.org/10.1175/JPO-D-12-0173.1), but our estimates of the Charnock coefficient do not increase with wind speed, which is possibly related to sampling swell-dominated seas. We find that the Stanton number is independent from wind speed. ATLANTIQUE 032 124 6 4290-4321 2019 2169-9275 https://www.documentation.ird.fr/hor/fdi:010076311 10.1029/2018JC014803 2169-9275 [F B010076311] https://www.documentation.ird.fr/hor/fdi:010076311 https://www.documentation.ird.fr/intranet/publi/depot/2019-07-17/010076311.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2019-07-17 2025-02-24 fdi:010076311 fre