TY - JOUR T1 - Mixed and mixing layer depths in the ocean surface boundary layer under conditions of diurnal stratification A1 - Sutherland,G. A1 - Reverdin,Gilles A1 - Marie,Louis A1 - Ward,Ben AD - Natl Univ Ireland, Sch Phys, Galway, Ireland AD - Univ Paris 06, Univ Sorbonne,Paris VI Denis Diderot Univ, Denis Diderot Univ,CNRS,IRD,MNHN, LOCEAN,Inst Pierre Simon Lapl Expt & Approches Nu, F-75252 Paris 05, France AD - UBO, IRD, IFREMER, Lab Phys Oceans,UMR 6523,CNRS, Plouzane, France AD - Ifremer, France UR - https://archimer.ifremer.fr/doc/00240/35101/ DO - 10.1002/2014GL061939 KW - ocean surface boundary layer KW - mixed and mixing layer depths KW - buoyancy N2 - A comparison between mixed (MLD) and mixing (XLD) layer depths is presented from the SubTRopical Atlantic Surface Salinity Experiment (STRASSE) cruise in the subtropical Atlantic. This study consists of 400 microstructure profiles during fairly calm and moderate conditions (2 < U10 < 10 m s−1) and strong solar heating O(1000 W m−2). The XLD is determined from a decrease in the turbulent dissipation rate to an assumed background level. Two different thresholds for the background dissipation level are tested, 10−8 and 10−9 m2 s−3, and these are compared with the MLD as calculated using a density threshold. The larger background threshold agrees with the MLD during restratification but only extends to half the MLD during nighttime convection, while the lesser threshold agrees well during convection but is deeper by a factor of 2 during restratification. Observations suggest the use of a larger density threshold to determine the MLD in a buoyancy driven regime. Y1 - 2014/12 PB - Amer Geophysical Union JF - Geophysical Research Letters SN - 0094-8276 VL - 41 IS - 23 SP - 8469 EP - 8476 ID - 35101 ER -