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Mid-Atlantic Bight. Transport over a Long Shallow Shelf. The Shelf. ~ 25m depth at the inner shelf ~ 50m at midshelf ~ 200m at the shelf break, where it then drops rapidly to deep ocean (1 Degree Longitude ~ 85.4km @ 40N) The distance shore to shelf break ranges from 60-200km.

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mid atlantic bight

Mid-Atlantic Bight

Transport over a Long Shallow Shelf

the shelf
The Shelf

~ 25m depth at the inner shelf

~ 50m at midshelf

~ 200m at the shelf break, where it then drops rapidly to deep ocean

(1 Degree Longitude ~ 85.4km @ 40N)

The distance shore to shelf break ranges from 60-200km

estuaries of the mab
Estuaries of the MAB

Chesapeake Bay system

Delaware Bay

Hudson River

tilburg s model
Tilburg's Model

K_M - vertical eddy viscosity

K_H - vertical eddy diffusivity

Density taken from the Equation of State

Salinity is constant

Horizontal eddy viscosity and diffusivity are constant

K_M terms calculated for surface wind stress and bottom stress given by D

L= 65km (width of shelf)

transport in 3 dimensions wind stress
Transport in 3 Dimensions - Wind Stress

Wind Stress is the primary mechanism for transport.

Integrated continuity equation can be used to demonstrate the surface and bottom stress is directly related to across shore transport while inversely related to along shore divergence.

transport in 3 dimensions buoyancy as an amplifier
Transport in 3 Dimensions - Buoyancy as an amplifier

Shallow Shelf allows for fresh water intrusions to reach the bottom instead of forming a lens.

Supports geostrophic, cyclonic flow of high downshelf velocity.

High shear across shore.

These intrusions become displaced offshore and mix while the region experiences upwelling at the coast.

transport in 3 dimensions buoyancy as an amplifier1
Transport in 3 Dimensions - Buoyancy as an amplifier

The buoyancy intrusion's flow is driven by stratification gradients (dN^2/dy) creating velocity gradients along shore.

Negative gradient indicates convergence with the intrusion upshelf.

Positive gradient indicates divergence with the intrusion downshelf.

While wind dominates the buoyancy intrusion under strong wind conditions, divergence may still be strong under light wind conditions.

references
References

Across-Shelf Transport on a Continental Shelf: Do Across-Shelf Winds Matter?

Tilburg 2003

Three-Dimensional Flow in a Shallow Coastal Upwelling Zone: Alongshore

Convergence and Divergence on the New Jersey Shelf

Tilburg and Garvine 2003

Additional Images from:

RUCOOL glider page

http://cmtt.tori.org.tw/data/App_map/Maps_jpg/4_13_Mid_Atlantic_Bight_New_York_Bight.jpg

http://ocw.mit.edu/resources/res-12-000-evolution-of-physical-oceanography-spring-2007/part-1/wunsch_chapter7.pdf