Wind forced variability of an estuarine outflow'

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Wind forced variability of an estuarine
outflow. Bob Chant , Elias Hunter, Scott
Glenn, Oscar Schofield, John Wilkin, Josh
Kohut Rutgers University
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Buoyant Plume
Bulge
Modified by Wind forcing
Coastal Current
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Without wind forcing model predicts that bulge
continues to grow
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Wind
During Down-welling Conditions Coastal Current
2-4 km wide
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Mean flow over deployment
Coastal Current is thin Maximum mean flows of 20
cm/s
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Potential Energy Anomaly (contour) Salinity
(color)
April 14-15
Fong and Geyer (2002)
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Cross-Shelf Salinity Section
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Ambrose Light Tower Winds
m/s
N/S winds hourly (blue) low-passed (red)
m/s
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D
Ambrose
Station 44025
D
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NS Winds
m/s
Down-shelf current and salinity
30
35 km
35 km
20
Down-shelf current and salinity
30
70 km
20
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Estuary
Land
Hudson Outflow H3-5 m U50 cm/s Winds 10
m/s will prevent turning
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Down shelf transport of fresh water will diminish
with distance.
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Salt Section from Glider Endurance Line
March 10-16
May 17-24
Significant Freshening Of 100 km wide section Of
shelf
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Conclusions
1) Hudson outflow is characterized by bulge
formation. 2) Outflow current is highly
responsive to wind forcing. 3) Sea-Breeze
forcing has major impact on outflows trajectory
and ultimate fate of freshwater 4) 1-3
work in concert to rapidly spread fresh-water
across shelf. 5) Important consequences for
cross-shelf transport of other
constituents, such as mercury.