1. North Pacific Gyre Oscillation synchronizes climate fluctuations in the eastern and western North Pacific
Lina I. Ceballos1, Emanuele Di Lorenzo1,
Niklas Schneider2, and Carlos D. Hoyos1
1 School of Earth and Atmospheric Sciences, Georgia Institute of Technology
2 International Pacific Research Center, University of Hawaii at Manoa
Western Pacific Geophysics Meeting, Cairns, Australia, 29 July - 1 August, 2008

2. North Pacific Oscillation (NPO)
SLPa EOF2
Atmosphere
North Pacific Oscillation
NPO

3. North Pacific Oscillation (NPO)
SLPa EOF2
Atmosphere
North Pacific Oscillation
NPO
Ocean
North Pacific Gyre Oscillation
NPGO
Di Lorenzo et al., 2008

4. North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
Ocean
North Pacific Gyre Oscillation
NPGO
Di Lorenzo et al., 2008
SSHa from Earth Simulator ocean model (OFES)
NPGO Index

5. North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
Ocean
North Pacific Gyre Oscillation
NPGO
Di Lorenzo et al., 2008
SSHa from Earth Simulator ocean model (OFES)
NPGO Index

6. North Pacific Gyre Oscillation (NPGO)
California Current
CalCOFI observations
North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
SSHa from Earth Simulator ocean model (OFES)
Di Lorenzo et al., 2008

7. North Pacific Gyre Oscillation (NPGO)
California Current
CalCOFI observations
North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
SSHa from Earth Simulator ocean model (OFES)
Di Lorenzo et al., 2008

8. North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
Is NPGO also linked to changes in the KOE?
SSHa from Earth Simulator ocean model (OFES)

9. North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
Is NPGO also linked to changes in the KOE?
SSHa from Earth Simulator ocean model (OFES)

10. North Pacific Gyre Oscillation (NPGO)
SSHa response to NPO
Is NPGO also linked to changes in the KOE?
SSHa from Earth Simulator ocean model (OFES)
Taguchi et al., 2007

11. Are NPGO and KOE related?

12. Are NPGO and KOE related?
Taguchi et al., 2007

13. Are NPGO and KOE related?
Taguchi et al., 2007
Di Lorenzo et al., 2008c

14. Are NPGO and KOE related?
NPGO leads KOE by 3 yrs
Taguchi et al., 2007
Di Lorenzo et al., 2008

15. Are NPGO and KOE related?
Correlation NPGO-KOE mode 2
NPGO leads KOE by 3 yrs
Taguchi et al., 2007
Di Lorenzo et al., 2008

16. Are NPGO and KOE related?
transect
Correlation NPGO-KOE mode 2
35.25°N
NPGO leads KOE by 3 yrs
Taguchi et al., 2007
Di Lorenzo et al., 2008

17. Are NPGO and KOE related?
transect
35.25°N
Western
Boundary
Eastern
Boundary
Lagged correlation
KOE mode 2 vs. SSHa

18. Are NPGO and KOE related?
transect
35.25°N
Western
Boundary
Eastern
Boundary
Lagged correlation
KOE mode 2 vs. SSHa

19. What dynamics control the westward propagation?
Western
Boundary
Eastern
Boundary
Lagged correlation
KOE mode 2 vs. SSHa

20. What dynamics control the westward propagation?
Rossby wave model
(Qiu, 2003)
What dynamics control the westward propagation?

21. Rossby wave model
(Qiu, 2003)
Sea surface height anomaly
Ekman pumping

22. NCEP/NCAR monthly wind stress
Rossby wave model
Section 32°-38°N
(Qiu, 2003)
NCEP/NCAR monthly wind stress

23. NCEP/NCAR monthly wind stress
Rossby wave model
Section 32°-38°N
(Qiu, 2003)
NCEP/NCAR monthly wind stress

24. NCEP/NCAR monthly wind stress
Rossby wave model
Section 32°-38°N
(Qiu, 2003)
NCEP/NCAR monthly wind stress

25. Rossby wave model What is the role of NPO in driving SSHa in the KOE?
Section 32°-38°N
(Qiu, 2003)
NCEP/NCAR monthly wind stress
What is the role of NPO in driving SSHa in the KOE?

26. Modes of atmospheric variability
Forcing of the NPGO
(Di Lorenzo et al., 2008;
Chhak et al.,2008)
North Pacific Oscillation

27. Modes of atmospheric variability
Aleutian mode
Forcing of the NPGO
(Di Lorenzo et al., 2008;
Chhak et al.,2008)
North Pacific Oscillation

28. Modes of atmospheric variability
Method of analysis:
We decompose the wind stress field into the AL and NPO mode to drive Rossby Wave model
Aleutian mode
North Pacific Oscillation

29. Modes of atmospheric variability
Aleutian mode
North Pacific Oscillation

30. Modes of atmospheric variability
Aleutian mode
North Pacific Oscillation

31. Summary

32. Summary

33. Summary

34. Summary

35. Summary

36. Are NPGO and KOE related?
NPGO: strength of the central/eastern branch of subtropical gyre
KOEmode 2: strength of the Kuroshio Jet
3 year lag

37. Are NPGO and KOE related?
transect
35.25°N
NPGO: strength of the central/eastern branch of subtropical gyre
KOEmode 2: strength of the Kuroshio Jet
3 year lag
we perform a
Lagged correlation
KOE mode 2 vs. SSHa