Island Wake in Deep/Shallow Water
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Island Wake in Deep/Shallow Water
Changming DongJames McWilliams
Alexander Shchepetkin
IGPP/UCLA
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1. Island Effects in SCB
2. Island Wake in Deep Water
3. Island Wake in Shallow Water
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Island Wakes in SCB
( a manuscript to be submitted to CSR)
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RADARSAT SAR IMAGE (Caldeira et al, 2005)
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LA
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Two Types of Wakes
1. Deep Water: the vorticity is generated within lateral boundary of the island.
2. Shallow Water:
The vorticty is generated by two ways in homogenous ocean (Signell, 1989):
a. Slope Torque b. Speed Torque and additional one with stratification (Smolarkiewicz et al,
1989) c. Baroclinic tilting
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Island Wake in Deep Water
(a manuscript submitted to JPO)
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Centrifugal Instability
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Barotropic and Baroclinic Instabilities
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Reynolds Number
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Rossby Number
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Burger Number
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Island Wake in Shallow Water (with Slope)
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An additional nondimensional parameter: Internal Froude Number (Fr), must be introduced in the shallow-water wake.
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Summary
1. In SCB, island wakes is very significant characterizing SCB circulation.
2. Three types of instabilities identified in deep-water island wakes,in which three nondimensional parameters (Re,Ro and Bu) are dominant.
3. In the shallow-water wake, an additional dimensionless parameter (Fr) is important.