Ekman Transport. Ekman transport is the direct wind driven transport of seawater Boundary layer process Steady balance among the wind stress, vertical eddy viscosity & Coriolis forces Story starts with Fridtjof Nansen [1898]. Fridtjof Nansen. One of the first scientist-explorers
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Nansen’s Fram
Fram Ship Locked in Ice
1893 -1896 - Nansen got to 86o 14’ N
Motion is to the right of the wind
W = 7.29x10-5 s-1 & f = latitude
Coriolis = wind stress
f ue = tw / (r D)
Ekman velocity = ue
ue = tw / (r f D)
Ekman transport = Qe
Qe = tw / (r f) = [m2 s] = [m3 s-1 m-1]
(Volume transport per length of fetch)
Current Meters
Vector Measuring Vector Averaging
Current Meter Current Meter
theory
observerd
W = 7.29x10-5 s-1 & f = latitude
D’Asaro et al. [1995] JPO