SST contour interval 1K wind speed m/s. Imprint of ocean mesoscale on extratropical atmosphere warm SST associated with high wind speed
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1 Characterization of frontal air-sea interaction by spectral transfer functions Niklas Schneider 1, Bunmei Taguchi 2, Masami Nonaka 2 and Akira Kuwano-Yoshida 2 1 International Pacific Research Center, University of Hawaii, Honolulu, USA 2 Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan SST contour interval 1K wind speed m/s Chelton and Xie Oceanography, 2010 July 2002, monthly average, spatially high pass filtered Imprint of ocean mesoscale on extratropical atmosphere warm SST associated with high wind speed International Ocean Vector Winds Science Team Meeting, Hokkaido University, Sapporo, Japan, May 17-19, 2016
2 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 inversion Background Ekman spiral 2
3 SST perturbation Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 inversion Background warm Ekman spiral 2
4 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 SST perturbation Vertical mixing mechanism (Wallace et al. 1989, Hayes et al. 1989, Samelson et al. 2006) inversion Background warm Ekman spiral 2
5 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 SST perturbation Vertical mixing mechanism (Wallace et al. 1989, Hayes et al. 1989, Samelson et al. 2006) inversion Background warm Ekman spiral 2
6 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 SST perturbation Vertical mixing mechanism (Wallace et al. 1989, Hayes et al. 1989, Samelson et al. 2006) Pressure effect (Lindzen and Nigam 1987) inversion Background warm Ekman spiral 2
7 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 SST perturbation Vertical mixing mechanism (Wallace et al. 1989, Hayes et al. 1989, Samelson et al. 2006) Pressure effect (Lindzen and Nigam 1987) inversion Wind&inversion response advection rotation back pressure vertical mixing continuity Background warm Ekman spiral 2
8 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 weak SST perturbation inversion wind&inversion response advection rotation back pressure vertical mixing continuity Background warm Ekman spiral 3
9 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 weak SST perturbation advection by background winds only inversion wind&inversion response advection rotation back pressure vertical mixing continuity Background warm Ekman spiral 3
10 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 weak SST perturbation advection by background winds only vertical mixing mechanism acts on background shear only background mixing acts on frontally induced winds inversion wind&inversion response advection rotation back pressure vertical mixing continuity Background warm Ekman spiral 3
11 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 weak SST perturbation advection by background winds only vertical mixing mechanism acts on background shear only background mixing acts on frontally induced winds linear Rossby adjustment problem with coefficients constant in x, y A!! k Φ!! k = D!! k T!! k dynamics u, v, w, h, Θ SST forcing 4
12 Air-sea interaction at weak SST fronts Schneider and Qiu, JAS, 2015 weak SST perturbation advection by background winds only vertical mixing mechanism acts on background shear only background mixing acts on frontally induced winds linear Rossby adjustment problem with coefficients constant in x, y A!! k Φ!! k = D!! k T!! k dynamics u, v, w, h, Θ SST forcing Φ!! k = A!! k 1 D!! k T!! k Transfer function dependent on background wind speed, direction mixing formulation 4
13 Transfer function for surface wind speed
14 Transfer function for surface wind speed background surface wind direction
15 Transfer function for surface wind speed background surface wind direction downwind wave-number
16 Transfer function for surface wind speed background surface wind direction crosswind wave-number downwind wave-number
17 Transfer function for surface wind speed Ug /gravity wave speed crosswind wave-number downwind wave-number
18 Transfer function for surface wind speed Ug /gravity wave speed Frontally induced surface wind speed in phase with SST crosswind wave-number downwind wave-number
19 Transfer function for surface wind speed Ug /gravity wave speed Frontally induced surface wind speed in phase with SST crosswind wave-number 90 phase-shifted with SST downwind wave-number
20 Surface wind speed, best fit linear model crosswind wave-number downwind wave-number
21 Surface wind speed, best fit linear model crosswind wave-number crosswind wave-number downwind wave-number downwind wave-number
22 Surface wind speed, best fit linear model QuikSCAT crosswind wave-number /0.1 ms -1 K -1 downwind wave-number
23 Conclusions A linearized model for the atmospheric boundary layer response to ocean mesoscale sea surface temperatures is tested. Spectral transfer functions of the linear model and based on an AGCM (AFES) and QuikSCAT observations compare favorably in the Southern Ocean, and suggest that the linear model captures the underlying physics. Additional physics can be tested to improve fit between linear model, AGCMs and observations. Schneider, N. and B. Qiu, 2015: The atmospheric response to weak sea surface temperature fronts. J. Atmos. Sci., 72,
24 Cross-wind crosswind wave-number downwind wave-number
25 Cross-wind QuikSCAT /0.1 ms -1 K -1 crosswind wave-number downwind wave-number
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