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Detect Eddies from High-Resolution SST Data

Detect Eddies from High-Resolution SST Data. Changming “Charles” Dong UCLA. An Example: Synthesis of SST, SSHA, and Drifters for an Eddy. Thermal Velocity Derived from SST. Where D is the vertical scale, α is the expansion coefficient β is the salt contraction coefficient.

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Detect Eddies from High-Resolution SST Data

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  1. Detect Eddies from High-Resolution SST Data Changming “Charles” Dong UCLA

  2. An Example: Synthesis of SST, SSHA, and Drifters for an Eddy

  3. Thermal Velocity Derived from SST Where D is the vertical scale, α is the expansion coefficient β is the salt contraction coefficient.

  4. Calculate Thermal-Velocity A Sobel gradient operator is used to calculate SST gradients. where A is the SST matrix divided by grid size and cofficients A thermal velocity vector V= (Ux,Uy), where Ux= - Gy; Uy= Gx on the northern hemisphere Ux= Gy; Uy= Gx on the southern hemisphere

  5. Eddy Detection Using SST-derived Thermal-Velocity Adapted from Dong et al (2011)

  6. Thermal-Velocity

  7. Example: Eddy Tracking Adapted from Dong et al (2011)

  8. EKE derived from thermal velocity in the Northern Pacific Ocean

  9. Comparable with EKE from SSHA

  10. Compared with EKE from Global Surface Drifter Data

  11. Statistical Analysis REMSS SST (2006-2008) AVISO SSHA (1993-2008)

  12. Example: Automated Eddy Track Using SST-derived Thermal-Velocity

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