The atmospheric response to an Oyashio SST front shift in an atmospheric GCM. Dima Smirnov, Matt Newman, Mike Alexander, Young-Oh Kwon & Claude Frankignoul August 6, 2013 Workshop on SST Fronts Boulder, Colorado. Impact of SST fronts on mean state. Significant impact has now been shown.
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The atmospheric response to an Oyashio SST front shift in an atmospheric GCM
Dima Smirnov, Matt Newman, Mike Alexander, Young-Oh Kwon & Claude Frankignoul
August 6, 2013
Workshop on SST Fronts
Impact of SST fronts on mean state
Minobe et al., 2008
No front (dash)
SST anomalies in front/no-front experiments approach 10°C
Nakamura et al., 2008
Impact on variability
w/ obs SST (solid)
Taguchi et al., 2009
dSST/dy (°C 100 km-1)
OEI from Frankignoul et al., 2011
Mean Nov-Mar difference: SLP (contour), turbulent heat flux (color), 2-m wind (arrow)
SST (thin contour), SLP (thick contour)
ω (contour, 1.5x10-3 Pa s-1)
div (color, s-1)
What is the cause of the stronger circulation in the HR model?
Decomposeω using the generalized ωequation:
HR: All forcing
HR: Model Output
Re-constructed (left) not perfect, but still useful to compare contribution of individual terms.
850mb v’T’ (mean: contour, diff: color)
Eddies in HR show a much greater sensitivity to the SST frontal shift
Cross-section across the front
K m s-1
Experiment (0.25° CAM5)