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Modeling North Pacific Decadal Variations and Their Teleconnection Patterns. Speaker/ Pei-Ning Kirsten Feng Advisor/ Yu-Heng Tseng. Outline. Motivation Objective Overview Data Source Methods and Model Recent Result Summary and future work. Motivation. - PowerPoint PPT Presentation
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Modeling North Pacific Decadal Variations and Their
Teleconnection Patterns
Speaker/ Pei-Ning Kirsten Feng
Advisor/ Yu-Heng Tseng
Outline
• Motivation • Objective• Overview • Data Source• Methods and Model• Recent Result• Summary and future work
Motivation
• Since the long tern climate is impacted by the ocean-atmospheric interactions, if we want to use modeling to simulate the climate, it is necessary to know what kind of low-frequency oscillation is referred.
• Further it is found that PDO can not explain the oscillations in the ocean, however NPGO seems more related to the variations. Thus we want to know its relationship with other oscillations and climate.
Objective
• First we want to summarize the oscillations and determine their relations, especially stressed on the Pacific area.
• We want to compare the model simulation to the observations and see if those oscillations are shown in the resolutions.
Terms
Pacific Decadal Variations
[Di Lorenzo et al., 2008]
PDO AREA
North Pacific – AL/PDO
• The Pacific Decadal Oscillation (PDO) Index is defined as the leading principal component of North Pacific monthly sea surface temperature (SST) variability (poleward of 20N).
[Mantua et al., 1997]
Warm Phase Cool Phase
North Pacific – AL/PDO
50 100 150 200 250
20
40
60
80
100
SST EOF-1
-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
-300 -250 -200 -150 -100-40
-20
0
20
40
60
SLP 1 (27.7905%)
-1 -0.5 0 0.5 1
-300 -250 -200 -150 -100
-30
-20
-10
0
10
20
30
40
50
60
SST 1 (27.7905%)
-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8
•The Pacific Decadal Oscillation (PDO) Index is defined as the leading principal component of North Pacific monthly sea surface temperature (SST) variability (poleward of 20N).
North Pacific – NPO/NPGO
• North Pacific Gyre Oscillation, NPGO:
• The NPGO is defined as the second dominant mode of SSHa variability in the Northeast Pacific [180°–110°W; 25°N–62°N] and is correlated with the second mode of North Pacific SSTa.
[Di Lorenzo et al., 2008]
Atmosphere-Ocean Interaction
[Di Lorenzo et al., 2010]
Global Pattern and Teleconnection
• AO
• AL ←→ PDO
• ENSO / EPW• WP • CPW
• NAO• NPO ←→ NPGO
• KOE
• PNA
• How these oscillations play roles in the long term climate?
Teleconnection
Pacific Pattern -- WP
Atlantic Pattern -- NAO
Global Pattern -- AO
Data source
Data source
• Hadley SST
• Hadley SLP
• NCEP/NCAR Reanalysis
Methods and Model
Model
Atmosphere-Ocean Interaction
• PDO– SSTa PC-1
• NPGO– SSHa PC-2 • ENSO
• AL & NPO forcings
• Model reconstruction– A. PDO (corrcoef)
– B. NPGO (corrcoef)
– C. Teleconnections
• Observation data:– SLP : Hadley SLP
– SST : HadISST
Thanks For Your Attention
……つづく
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