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Changming “Charles” Dong IGPP, University of California, Los Angeles Yu Liu

Towards Better Understanding of Eddy Variation Using SST Data: Application in the Northern Pacific Ocean. Changming “Charles” Dong IGPP, University of California, Los Angeles Yu Liu SCSI, Chinese Academy of Science, GuangZhou, China Acknowledgements: NASA PO Grant,

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Changming “Charles” Dong IGPP, University of California, Los Angeles Yu Liu

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  1. Towards Better Understanding of Eddy Variation Using SST Data: Application in the Northern Pacific Ocean Changming “Charles” Dong IGPP, University of California, Los Angeles Yu Liu SCSI, Chinese Academy of Science, GuangZhou, China Acknowledgements: NASA PO Grant, F. Nencioli, R. Lumpkin, M. Lankhorst, J. Vanzequez, E. Armsrong, Y. Chao, J. McWillimas. D. Chen, and Y. Guan.

  2. Outline • Motivation • Pseudo-Velocity Derived from SST Data • Pseudo-EKE • Cohesive Eddies Product from REMSS SST • Summary

  3. OBJECTIVE • Set up a global oceanic eddy data set by synthesizing available observational data • Observational data: SST, SSHA, global surface drifters, Argo data, and other in-situ data • Eddy Detection Tools a. Nencioli and Dong et al (2009, JAOT) (Automated Vector Geometry Eddy Detection) b. Dong et al (2010, JAOT, submitted) (Automated Loops Detection from Surface Drifters) c. Dong et al (2010, IEEE-GRSL, submitted) (Automated Eddy Detection Scheme from SST Data)

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

  5. Why we need a synthesis of these data: Abnormal Eddies

  6. Application: Kuroshio Extension

  7. SST-derived Pseudo-Velocity A Sobel gradient operator is used to calculate SST gradients. where A is the SST matrix divided by grid size A pseudo-velocity vector V= (Ux,Uy), where Ux= - Gy; Uy= Gx on the northern hemisphere Ux= Gy; Uy= Gx on the southern hemisphere

  8. Example: Pseudo-Velocity

  9. More About Pseudo-Velocity Where D is the vertical scale, α is the expansion coefficient β is salt contraction coefficient.

  10. Pseudo-EKE in the Northern Pacific Ocean

  11. Comparable with EKE from SSHA

  12. Compared with EKE from Global Surface Drifter Data

  13. EKE Westward Propagation U= 6 cm/s at 24~25 N

  14. Eddy Identification Using SST-derived Pseudo-Velocity Adapted from Dong et al (2010)

  15. Example: Eddy Tracking

  16. Application to REMSS SST (9km) in North Pacific Ocean

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

  18. Summary • Motivated by an objective to develop a global oceanic eddy data set by synthesizing available observational data • Pseudo-velocities derived from SST data are used for eddy Analysis • So far, we have finished KE region and NP. We will move on to the global ocean

  19. Example: Eddy Automatic Track Using SST-derived Pseudo-Velocity

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