FN Archimer Export Format
PT J
TI A seasonal climatology of the upper ocean pycnocline
BT 
AF Sérazin, Guillaume
   TREGUIER, Anne-Marie
   de Boyer Montégut, Clement
AS 1:1;2:1;3:2;
FF 1:;2:;3:PDG-ODE-LOPS-SIAM;
C1 Ifremer, Univ. Brest, CNRS, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
   Ifremer, Univ. Brest, CNRS, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
C2 CNRS, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
IF 3.7
TC 2
UR https://archimer.ifremer.fr/doc/00828/93977/100800.pdf
   https://archimer.ifremer.fr/doc/00828/93977/100801.pdf
LA English
DT Article
DE ;upper ocean stratification;mixed layer depth;boundary layer;air-sea exchanges;seasonal variability
AB Climatologies of the mixed layer depth (MLD) have been provided using several definitions based on temperature/density thresholds or hybrid approaches. The upper ocean pycnocline (UOP) that sits below the mixed layer base remains poorly characterized, though this transition layer is an ubiquitous feature of the ocean surface layer. Available hydrographic profiles provide near-global coverage of the world’s ocean and are used to build a seasonal climatology of UOP properties – intensity, depth, thickness – to characterize the spatial and seasonal variations of upper ocean stratification. The largest stratification values O(10−3s−2) are found in the intertropical band, where seasonal variations of the UOP are also very small. The deepest (> 200 m) and least stratified O(10−6s−2) UOPs are found in winter along the Antarctic Circumpolar Current (ACC) and at high latitudes of the North Atlantic. The UOP thickness has a median value of 23 m with limited seasonal and spatial variations; only a few regions have UOP thicknesses exceeding 35 m. The UOP properties allow the characterization of the upper ocean restratification that generally occurs in early spring and is generally associated with large variability. Depending on the region, this restratification may happen gradually as around the Rockall plateau or abruptly as in the Kuroshio Extension. The UOP is also likely to merge intermittently with the permanent pycnocline in winter. The upper edge of the UOP is eventually close to MLD estimates, except in a few notable regions such as in the Pacific Warm Pool where barrier layers are important, and during wintertime at high latitudes of the North Pacific. 
PY 2023
PD MAR
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 10
UT 000953178600001
DI 10.3389/fmars.2023.1120112
ID 93977
ER

EF