North Pacific Gyre Oscillation North Pacific Gyre Oscillation synchronizes climate fluctuations in synchronizes climate fluctuations in

the eastern and western the eastern and western North PacificNorth Pacific

Lina I. Ceballos1, Emanuele Di Lorenzo1, Niklas Schneider2, and Carlos D. Hoyos1

1 School of Earth and Atmospheric Sciences, Georgia Institute of Technology2 International Pacific Research Center, University of Hawaii at Manoa

Western Pacific Geophysics Meeting, Cairns, Australia, 29 July - 1 August, 2008

North Pacific Oscillation (NPO)North Pacific Oscillation (NPO)

North Pacific Oscillation NPO

AtmosphereSLPa EOF2

North Pacific Oscillation (NPO)North Pacific Oscillation (NPO)

North Pacific Oscillation NPO

AtmosphereSLPa EOF2

North Pacific Gyre Oscillation NPGO

Ocean

Di Lorenzo et al., 2008

SSHa from Earth Simulator ocean model (OFES)

North Pacific Gyre Oscillation NPGO

Ocean

SSHa response to NPO

NPGO Index

North Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

Di Lorenzo et al., 2008

NPGO IndexSSHa from Earth Simulator ocean model (OFES)

North Pacific Gyre Oscillation NPGO

Ocean

SSHa response to NPONorth Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

Di Lorenzo et al., 2008

Di Lorenzo et al., 2008

California CurrentCalCOFI observations

SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPONorth Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

Di Lorenzo et al., 2008

California CurrentCalCOFI observations

SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPONorth Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPO

Is NPGO also linked to changes in the KOE?

North Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPO

Is NPGO also linked to changes in the KOE?

North Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

North Pacific Gyre Oscillation (NPGO)North Pacific Gyre Oscillation (NPGO)

Taguchi et al., 2007

SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPO

Is NPGO also linked to changes in the KOE?

Are NPGO and KOE related?Are NPGO and KOE related?

Are NPGO and KOE related?Are NPGO and KOE related?

Taguchi et al., 2007

Are NPGO and KOE related?Are NPGO and KOE related?

Taguchi et al., 2007 Di Lorenzo et al., 2008c

Are NPGO and KOE related?Are NPGO and KOE related?

NPGO leads KOE by 3 yrs

Taguchi et al., 2007 Di Lorenzo et al., 2008

Are NPGO and KOE related?Are NPGO and KOE related?

NPGO leads KOE by 3 yrs

Taguchi et al., 2007 Di Lorenzo et al., 2008

Correlation NPGO-KOE mode 2

Are NPGO and KOE related?Are NPGO and KOE related?Correlation NPGO-KOE mode 2 transect

35.25°N

Taguchi et al., 2007 Di Lorenzo et al., 2008

NPGO leads KOE by 3 yrs

transect35.25°N

Are NPGO and KOE related?Are NPGO and KOE related?

Lagged correlationKOE mode 2 vs. SSHa

EasternBoundary

WesternBoundary

transect35.25°N

Are NPGO and KOE related?Are NPGO and KOE related?

Lagged correlationKOE mode 2 vs. SSHa

EasternBoundary

WesternBoundary

EasternBoundary

WesternBoundary

What dynamics control the westward propagation?

Lagged correlationKOE mode 2 vs. SSHa

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

Rossby wave modelRossby wave model

eR wgg

xhc

th '

(Qiu, 2003) What dynamics control the westward propagation?

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

Rossby wave modelRossby wave model

eR wgg

xhc

th '

(Qiu, 2003) Sea surface height anomaly

Ekman pumping

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

NCEP/NCAR monthly NCEP/NCAR monthly wind stresswind stress

eR wgg

xhc

th '

(Qiu, 2003)

Rossby wave modelRossby wave model Section 32°-38°N

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

NCEP/NCAR monthly NCEP/NCAR monthly wind stresswind stress

eR wgg

xhc

th '

(Qiu, 2003)

Rossby wave modelRossby wave model Section 32°-38°N

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

NCEP/NCAR monthly NCEP/NCAR monthly wind stresswind stress

eR wgg

xhc

th '

(Qiu, 2003)

Rossby wave modelRossby wave model Section 32°-38°N

x

Re

R

dxcxxtxw

gfcgtxh

00

'','',

NCEP/NCAR monthly NCEP/NCAR monthly wind stresswind stress

eR wgg

xhc

th '

(Qiu, 2003)

Rossby wave modelRossby wave model Section 32°-38°N

What is the role of NPO in driving SSHa

in the KOE?

North Pacific Oscillation

Modes of atmospheric variabilityModes of atmospheric variability

Forcing of the NPGO(Di Lorenzo et al., 2008;

Chhak et al.,2008)

Aleutian mode

North Pacific Oscillation

Modes of atmospheric variabilityModes of atmospheric variability

Forcing of the NPGO(Di Lorenzo et al., 2008;

Chhak et al.,2008)

Aleutian mode

North Pacific Oscillation

We decompose the wind stress field into the AL and NPO mode to drive Rossby Wave model

Modes of atmospheric variabilityModes of atmospheric variability

Method of analysis:

Modes of atmospheric variabilityModes of atmospheric variability

Aleutian mode

North Pacific Oscillation

Modes of atmospheric variabilityModes of atmospheric variability

Aleutian mode

North Pacific Oscillation

SummarySummary

SummarySummary

SummarySummary

SummarySummary

SummarySummary

Are NPGO and KOE related?Are NPGO and KOE related?

KOEmode 2: strength of the Kuroshio Jet

NPGO: strength of the central/eastern branch of subtropical gyre3 year lag

Are NPGO and KOE related?Are NPGO and KOE related?transect

35.25°N

Lagged correlationKOE mode 2 vs. SSHa

we perform a

KOEmode 2: strength of the Kuroshio Jet

NPGO: strength of the central/eastern branch of subtropical gyre3 year lag