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~ 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
The Shelf
Tilburg's ModelK_M - vertical eddy viscosityK_H - vertical eddy diffusivity
Density taken from the Equation of State
Salinity is constantHorizontal 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
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 amplifierShallow 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 amplifierThe 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.
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 ShelfTilburg 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
References