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Comparison of Computed Geostropic Currents and ADCP
LT David Blencoe 21 March, 2001
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CALCOFI Line 67 Monterey Bay CALCOFI Line 67
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Actual Ship Track Data Collection: Dec, 2000
All CTD casts went to depth of 1000 m. Data discarded because depth of CTD cast was only 242 m
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T-S Diagram Large Variation of Salinities in surface water
Colder, Deeper water transporting saltier water poleward.
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ADCP Currents
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Temp & Salinity Plots
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Density Anomaly
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Computing Geostropic Currents
v = -1/f (p/x) (-1/)(p/x) = fv Specific Values: = density f = 2sin = e-5 s-1 = latitude
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Computing Geostropic Currents, (Contd.)
p/x = pressure along line D = 0zdp where: = 1/, specific volume anomaly z = reference level/level of no motion (1000dbar) Making: v= D 2sin x
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Geostropic Currents
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Any Questions?
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