FN Archimer Export Format
PT J
TI Mesoscale SST–wind stress coupling in the Peru–Chile current system: Which mechanisms drive its seasonal variability?
BT 
AF OERDER, Vera
   COLAS, François
   ECHEVIN, Vincent
   MASSON, Sebastien
   HOURDIN, Christophe
   JULLIEN, Swen
   MADEC, Gurvan
   LEMARIE, Florian
AS 1:1;2:1;3:1;4:1;5:1;6:1,2;7:1,3;8:4;
FF 1:;2:;3:;4:;5:;6:PDG-ODE-LOPS-SIAM;7:;8:;
C1 UPMC, IRD, CNRS, UMR7159,LOCEAN,IPSL, Paris, France.
   IFREMER, LOS, Plouzane, France.
   Natl Oceanog Ctr, Marine Syst Modelling Grp, European Way, Southampton SO14 3ZH, Hants, England.
   Univ Grenoble Alpes, CNRS, INRIA, LJK, F-38000 Grenoble, France.
C2 UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
   NOC, UK
   INRIA, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 4.146
TC 34
UR https://archimer.ifremer.fr/doc/00334/44480/45790.pdf
LA English
DT Article
DE ;Ocean-atmosphere interactions;Mesoscale SST-wind stress coupling;Regional coupled modeling;Eastern Boundary Upwelling System
AB Satellite observations and a high-resolution regional ocean–atmosphere coupled model are used to study the air/sea interactions at the oceanic mesoscale in the Peru–Chile upwelling current system. Coupling between mesoscale sea surface temperature (SST) and wind stress (WS) intensity is evidenced and characterized by correlations and regression coefficients. Both the model and the observations display similar spatial and seasonal variability of the coupling characteristics that are stronger off Peru than off Northern Chile, in relation with stronger wind mean speed and steadiness. The coupling is also more intense during winter than during summer in both regions. It is shown that WS intensity anomalies due to SST anomalies are mainly forced by mixing coefficient anomalies and partially compensated by wind shear anomalies. A momentum balance analysis shows that wind speed anomalies are created by stress shear anomalies. Near-surface pressure gradient anomalies have a negligible contribution because of the back-pressure effect related to the air temperature inversion. As mixing coefficients are mainly unchanged between summer and winter, the stronger coupling in winter is due to the enhanced large-scale wind shear that enables a more efficient action of the turbulent stress perturbations. This mechanism is robust as it does not depend on the choice of planetary boundary layer parameterization.
PY 2016
PD OCT
SO Climate Dynamics
SN 0930-7575
PU Springer
VL 47
IS 7-8
UT 000384549500018
BP 2309
EP 2330
DI 10.1007/s00382-015-2965-7
ID 44480
ER

EF