FN Archimer Export Format
PT J
TI Surface roughness changes by fine scale current gradients: Properties at multiple azimuth view angles
BT 
AF RASCLE, Nicolas
   NOUGUIER, Frederic
   CHAPRON, Bertrand
   MOUCHE, Alexis
   PONTE, Aurelien
AS 1:1;2:2;3:3;4:3;5:3;
FF 1:;2:PDG-ODE-LOPS-SIAM;3:PDG-ODE-LOPS-SIAM;4:PDG-ODE-LOPS-SIAM;5:PDG-ODE-LOPS-OH;
C1 Inst Francais Rech Exploitat Mer, Lab Oceanog Spatiale, Plouzane, France.
   Univ Toulon & Var, Mediterranean Inst Oceanog, CNRS, INSU,IRD,UM 110, La Garde, France.
   Inst Francais Rech Exploitat Mer, Lab Phys Oceans, Plouzane, France.
C2 IFREMER, FRANCE
   UNIV TOULON & VAR, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
   PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.13
TC 16
UR https://archimer.ifremer.fr/doc/00358/46878/46759.pdf
   https://archimer.ifremer.fr/doc/00358/46878/48132.pdf
LA English
DT Article
AB At times, high resolution images of sea surface roughness can provide stunning details of submesoscale upper ocean dynamics. As interpreted, transformations of short scale wind waves by horizontal current gradients are responsible for those spectacular observations. Those observations could prove particularly useful to validate numerical ocean models which reach increasingly high resolutions.  Focusing on surface roughness at optical wavelengths, two steps have recently been performed in that direction. First, it was shown by Rascle et al. (2014, Journal of Physical Oceanography) that surface roughness variations not only trace surface current divergence but also other characteristics of the current gradient tensor, mainly the strain in the wind direction. The wind direction with respect to the current gradient thus stands out as an important interpretative parameter.  The second step is the purpose of the present paper, where we investigate the effect of the viewing direction. To this end, we discuss pairs of quasi-simultaneous sun glitter images, taken from different satellite positions to provide different viewing configurations, namely quasi-orthogonal azimuth angles at similar zenith angles. As evidenced, upwind and crosswind viewing observations can be markedly different. As further confirmed with idealized numerical simulations, this anisotropy well traces anisotropic surface current areas, while more isotropic contrasts likely trace areas dominated by surface divergence conditions.  These findings suggest the potential to directly separate divergence from other deformations by using high resolution roughness observations at multiple azimuth view angles.
PY 2016
PD DEC
SO Journal Of Physical Oceanography
SN 0022-3670
PU Amer Meteorological Soc
VL 46
IS 12
UT 000391349300011
BP 3681
EP 3694
DI 10.1175/JPO-D-15-0141.1
ID 46878
ER

EF