Lixin Wu

1
Atlantic-Pacific Teleconnection in Response to a
weakening of the Atlantic Meridional Overturning
Circulation

• Lixin Wu
• Physical Oceanography Laboratory
• Ocean University of China
• Qingdao, China
• Collaborators
• Chun Li, Chunxue Yang, Changfang Fang, OUC
• Shang-Ping Xie, IPRC

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Atlantic-Pacific Extratropical and Tropical
Teleconnection
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Winter(JFM) Geopotential Height
H
H
L
L
H
H
Z850
Z250
5
Surface Wind and Air Temp.
Precipitation
Mild and Wet Winter
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Early Winter (OND) Atmospheric Response
L
H
L
Z850
Z250
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FOAM Experiment
(Lixin Wu, Feng He and Zhengyu Liu, 2005, GRL)
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Tropical Atlantic-Pacific Bridge
FMA
JJA
OND
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South Atlantic Forcing
FMA
JJA
OND
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Predictability
FMA
JJA
OND
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Tropical Atlantic-Pacific Bridge
warm
12
Water-Hosing ExperimentAtlantic-Pacific
Teleconnection
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Water-Hosing
CTRL
AMOC ON
AMOC off
10Sv
ON
Recovery
Collapse
SV
OFF
Year
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Seasonality Of Atlantic Response

• Two questions
• NA-TA Atmos. Tele.
• Ocean Heat Transport

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Seasonal Response of Extratropical Atmospheric
Circulation
Quasi-baratropic
Baroclinic
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Extratropical influence on the tropics through
Atmospheric teleconnection
Coupling in the NA
No Coupling in the NA
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MJJ
ASO
NDJ
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Eqautrorial Pacific Annual Cycle
No coupling in the tropical Atlantic
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Seasonal response of North Pacific
No coupling in the NA
No Northern hemispheric atmospheric Tele.
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Does tropical Atlantic matter for the Northern
hemispheric teleconnection?
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Extratropical-tropical Pacific Teleconnection
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Coupled Propagation Mechanism
Coupled equatorward propagation due to
wind-evaporation feedback
ITCZ
West
East
Xie and Philander 1994 Wu et al. 2006 (Climate
Dynamics, in press)
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