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Island Wake in Deep/Shallow Water

Island Wake in Deep/Shallow Water. Changming Dong James McWilliams Alexander Shchepetkin. IGPP/UCLA. 1. Island Effects in SCB 2. Island Wake in Deep Water 3. Island Wake in Shallow Water. Island Wakes in SCB ( a manuscript to be submitted to CSR). RADARSAT SAR IMAGE

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Island Wake in Deep/Shallow Water

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  1. Island Wake in Deep/Shallow Water Changming Dong James McWilliams Alexander Shchepetkin IGPP/UCLA

  2. 1. Island Effects in SCB 2. Island Wake in Deep Water 3. Island Wake in Shallow Water

  3. Island Wakes in SCB ( a manuscript to be submitted to CSR)

  4. RADARSAT SAR IMAGE (Caldeira et al, 2005)

  5. LA

  6. Two Types of Wakes • 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

  7. Island Wake in Deep Water (a manuscript submitted to JPO)

  8. Centrifugal Instability

  9. Barotropic and Baroclinic Instabilities

  10. Reynolds Number

  11. Rossby Number

  12. Burger Number

  13. Island Wake in Shallow Water (with Slope)

  14. An additional nondimensional parameter: Internal Froude Number (Fr), must be introduced in the shallow-water wake.

  15. Summary • In SCB, island wakes is very significant characterizing • SCB circulation. • Three types of instabilities identified in deep-water island • wakes,in which three nondimensional parameters • (Re,Ro and Bu) are dominant. • In the shallow-water wake, an additional dimensionless • parameter (Fr) is important.

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