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Larry W. O’Neill, Tracy Haack, Dudley B. Chelton, and Eric Skyllingstad

-mean surface wind fields. Time averaging is often thought to mitigate the effects of synoptic weather variability, but these maps suggest otherwise. Despite this apparently strong influence from storms, a relatively robust local atmospheric response to SST is expected in the time-mean winds since the Gulf Stream SST signature is both persistent and spatially confined regardless of the exact response mechanism. Indeed, a strong response of the MABL winds and surface fluxes to the Gulf Stream SST frontal

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Niklas Schneider and Bo Qiu

1000 km, wind speeds are proportional to SST perturbations, and wind stress divergence and curl are proportional to the downwind and crosswind gradients of SST, respectively ( O’Neill et al. 2003 ; Chelton and Xie 2010 ; Song et al. 2009 ). The associated regression coefficients (i.e., coupling coefficients) vary seasonally and regionally, but the coupling coefficients between divergence and downwind SST gradients are consistently larger than those between wind stress curl and crosswind SST

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Kohei Takatama and Niklas Schneider

the right side of the jet and is manifested in reverse in negative and positive bands of the wind stress curl over the left and right sides of the current axis, respectively. Averaged over the parallelogram region the root-mean-square (RMS) of the OFES current curl (7.56 × 10 −6 s −1 ) is about 40% stronger than that of OSCAR (5.25 × 10 −6 s −1 ). Hereafter, we focus on the region of the parallelogram for statistics, unless noted otherwise. Seasonally averaged, large-scale winds in the MABL

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A. Foussard, G. Lapeyre, and R. Plougonven

as different wind directions to better assess the role of the background wind and of the stability of the boundary layer. Several effects are anticipated: The wind speed will influence both how turbulent the boundary layer is and how much advection decorrelates boundary layer temperature from SST. The direction of the wind will also play a role through the presence of the large-scale meridional SST gradient. For example, northerly winds will advect cold air above warm waters, inducing a larger

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