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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 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
Winter(JFM) Geopotential Height H H L L H H Z850 Z250
Surface Wind and Air Temp. Precipitation Mild and Wet Winter
Early Winter (OND) Atmospheric Response L H L Z850 Z250
FOAM Experiment (Lixin Wu, Feng He and Zhengyu Liu, 2005, GRL)
Tropical Atlantic-Pacific Bridge FMA JJA OND
South Atlantic Forcing FMA JJA OND
Predictability FMA JJA OND
Low Tropical Atlantic-Pacific Bridge warm
Water-Hosing CTRL AMOC “ON” AMOC “off” 10Sv ON SV Collapse Recovery OFF Year
Seasonality Of Atlantic Response • Two questions: • NA-TA Atmos. Tele. • Ocean Heat Transport
Seasonal Response of Extratropical Atmospheric Circulation Quasi-baratropic Baroclinic
Extratropical influence on the tropics through Atmospheric teleconnection Coupling in the NA No Coupling in the NA
Heat Flux, SST and Surface Wind year1 year2 year3 year4 year5 year6 year7 year8 year9 year10
MJJ ASO NDJ
Eqautrorial Pacific Annual Cycle No coupling in the tropical Atlantic
Seasonal response of North Pacific No coupling in the NA No Northern hemispheric atmospheric Tele.
Does tropical Atlantic matter for the Northern hemispheric teleconnection?
T U EQ 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)
+NAO Arctic Oscillation