Comparison of Computed Geostropic Currents and ADCP

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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
2?sin? ? 7.292 e-5 s-1 ? latitude
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Computing Geostropic Currents, (Contd.)
?p/?x pressure along line ?D
0?z?dp where ? 1/?, specific volume
anomaly z reference level/level of no motion
(1000dbar) Making v ?D
2?sin? ? x
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Geostropic Currents
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Any Questions?