In a steady state system subject to wind stirring and a mean stabilizing buoyancy flux, you might expect the MLD to be equivalent to 2 * mean(usr^3) / mean(B0), which in our case is 16 m. The mean MLD for this period though is 51 m. Obviously more is going on here.
What's going on in Oct-Nov? Both the surface forcing estimate (OB) and the shear instability estimate (Zri=0.65) predict a much shallower MLD than observed. Perhaps our MLD is not a good estimate of the true mixed layer depth?
For periods where the Z(ri=0.65) is defined, its mean depth is 35 m and the mean MLD is 45 m. Taking out OCT-NOV, the mean Z(ri=0.65) is 38 m and the mean MLD is 40 m.
Meghan F. Cronin
Pacific Marine Environmental Laboratory
7600 Sand Point Way NE
Seattle, WA 98115 USA
Meghan Cronin's Home Page
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