North Pacific Gyre Oscillation North Pacific Gyre Oscillation - - PowerPoint PPT Presentation

▶
north pacific gyre oscillation north pacific gyre
SMART_READER_LITE
LIVE PREVIEW

North Pacific Gyre Oscillation North Pacific Gyre Oscillation - - PowerPoint PPT Presentation

Dec 07, 2023 463 likes •846 views

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 Pacific North Pacific Lina I. Ceballos 1 , Emanuele

slide-1
SLIDE 1

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 Pacific 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

slide-2
SLIDE 2

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

North Pacific Oscillation

NPO

Atmosphere

SLPa EOF2

slide-3
SLIDE 3

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

North Pacific Oscillation

NPO

Atmosphere

SLPa EOF2

North Pacific Gyre Oscillation

NPGO

Ocean

Di Lorenzo et al., 2008

slide-4
SLIDE 4

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

slide-5
SLIDE 5

NPGO Index

SSHa from Earth Simulator ocean model (OFES)

North Pacific Gyre Oscillation

NPGO

Ocean

SSHa response to NPO

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

Di Lorenzo et al., 2008

slide-6
SLIDE 6

Di Lorenzo et al., 2008

California Current CalCOFI observations SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPO

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

slide-7
SLIDE 7

Di Lorenzo et al., 2008

California Current CalCOFI observations SSHa from Earth Simulator ocean model (OFES)

SSHa response to NPO

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

slide-8
SLIDE 8

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)

slide-9
SLIDE 9

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)

slide-10
SLIDE 10

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?

slide-11
SLIDE 11

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

slide-12
SLIDE 12

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

Taguchi et al., 2007

slide-13
SLIDE 13

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

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

slide-14
SLIDE 14

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

slide-15
SLIDE 15

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

slide-16
SLIDE 16

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

slide-17
SLIDE 17

transect

35.25°N

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

Lagged correlation KOE mode 2 vs. SSHa

Eastern Boundary Western Boundary

slide-18
SLIDE 18

transect

35.25°N

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

Lagged correlation KOE mode 2 vs. SSHa

Eastern Boundary Western Boundary

slide-19
SLIDE 19

Eastern Boundary Western Boundary

What dynamics control the westward propagation?

Lagged correlation KOE mode 2 vs. SSHa

slide-20
SLIDE 20

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ

Rossby wave model Rossby wave model

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003)

What dynamics control the westward propagation?

slide-21
SLIDE 21

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ

Rossby wave model Rossby wave model

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003) Sea surface height anomaly Ekman pumping

slide-22
SLIDE 22

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ NCEP/NCAR monthly NCEP/NCAR monthly wind stress wind stress

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003)

Rossby wave model Rossby wave model

Section 32°-38°N

slide-23
SLIDE 23

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ NCEP/NCAR monthly NCEP/NCAR monthly wind stress wind stress

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003)

Rossby wave model Rossby wave model

Section 32°-38°N

slide-24
SLIDE 24

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ NCEP/NCAR monthly NCEP/NCAR monthly wind stress wind stress

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003)

Rossby wave model Rossby wave model

Section 32°-38°N

slide-25
SLIDE 25

( )

∫

        − + =

x R e R

dx c x x t x w gf c g t x h ' ' , ' ' , ρ NCEP/NCAR monthly NCEP/NCAR monthly wind stress wind stress

e R

w g g x h c t h ' − = ∂ ∂ − ∂ ∂

(Qiu, 2003)

Rossby wave model Rossby wave model

Section 32°-38°N

What is the role of NPO in driving SSHa in the KOE?

slide-26
SLIDE 26

North Pacific Oscillation

Modes of atmospheric variability Modes of atmospheric variability Forcing of the NPGO

(Di Lorenzo et al., 2008; Chhak et al.,2008)

slide-27
SLIDE 27

Aleutian mode North Pacific Oscillation

Modes of atmospheric variability Modes of atmospheric variability Forcing of the NPGO

(Di Lorenzo et al., 2008; Chhak et al.,2008)

slide-28
SLIDE 28

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 variability Modes of atmospheric variability

Method of analysis:

slide-29
SLIDE 29

Modes of atmospheric variability Modes of atmospheric variability

Aleutian mode North Pacific Oscillation

slide-30
SLIDE 30

Modes of atmospheric variability Modes of atmospheric variability

Aleutian mode North Pacific Oscillation

slide-31
SLIDE 31

Summary Summary

slide-32
SLIDE 32

Summary Summary

slide-33
SLIDE 33

Summary Summary

slide-34
SLIDE 34

Summary Summary

slide-35
SLIDE 35

Summary Summary

slide-36
SLIDE 36

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

KOEmode 2: strength

  • f the Kuroshio Jet

NPGO: strength of the central/eastern branch

  • f subtropical gyre

3 year lag

slide-37
SLIDE 37

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

transect

35.25°N

Lagged correlation KOE mode 2 vs. SSHa we perform a

KOEmode 2: strength

  • f the Kuroshio Jet

NPGO: strength of the central/eastern branch

  • f subtropical gyre

3 year lag