Self - Induced Ekman Pumping Over Oceanic Mesoscale Eddies
Self - Induced Ekman Pumping Over Oceanic Mesoscale Eddies
Self - Induced Ekman Pumping Over Oceanic Mesoscale Eddies
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m s -1 per<br />
How does this eddy-induced <strong>Ekman</strong> pumping compare<br />
with <strong>Ekman</strong> pumping associated with the large-scale wind field?<br />
Combined SST and Eddy <strong>Induced</strong><br />
−→<br />
u a − −→ a −<br />
u o<br />
−→ u o<br />
D|urel| −→ • 30°S<br />
u • 20 cm amp.<br />
rel<br />
• 10 ms-1 wind<br />
• Max current<br />
40 cm s-1 W from Currents and 0.5 E oC SST Anomaly<br />
<strong>Ekman</strong> <strong>Pumping</strong><br />
WE = 1<br />
ρf ∇×−→ τ<br />
cm day -1<br />
Normalized Distance Contour Interval<br />
is 3 cm day Risien and Chelton, 2008<br />
from Eddy Centroid<br />
• <strong>Ekman</strong> pumping due to eddy-induced SST anomalies is secondary to the<br />
upwelling induced by the eddy surface currents<br />
• Eddy-induced <strong>Ekman</strong> pumping is of the same order of magnitude as basin<br />
scale <strong>Ekman</strong> pumping<br />
-1<br />
Eddy-induced <strong>Ekman</strong> pumping is an Order-1 Perturbation<br />
of the <strong>Ekman</strong> pumping associated with the large-scale wind field.<br />
cm da<br />
0.5 deg
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