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Modeling North Pacific Decadal Variations and Their Teleconnection Patterns

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.

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Modeling North Pacific Decadal Variations and Their Teleconnection Patterns

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  1. Modeling North Pacific Decadal Variations and Their Teleconnection Patterns Speaker/ Pei-Ning Kirsten Feng Advisor/ Yu-Heng Tseng

  2. Outline • Motivation • Objective • Overview • Data Source • Methods and Model • Recent Result • Summary and future work

  3. 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.

  4. 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.

  5. Terms

  6. Pacific Decadal Variations PDO AREA [Di Lorenzo et al., 2008]

  7. North Pacific – AL/PDO Warm Phase Cool Phase • 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]

  8. 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).

  9. 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]

  10. Atmosphere-Ocean Interaction [Di Lorenzo et al., 2010]

  11. Global Pattern and Teleconnection • AO • AL←→PDO • PNA • NAO • KOE • NPO ←→NPGO • WP • CPW • ENSO / EPW • How these oscillations play roles in the long term climate?

  12. Teleconnection

  13. Pacific Pattern -- WP

  14. Atlantic Pattern -- NAO

  15. Global Pattern -- AO

  16. Data source

  17. Data source • Hadley SST • Hadley SLP • NCEP/NCAR Reanalysis

  18. Methods and Model

  19. Model

  20. Atmosphere-Ocean Interaction • PDO • SSTa PC-1 • NPGO • SSHa PC-2 • ENSO • Model reconstruction • A. PDO (corrcoef) • B. NPGO (corrcoef) • C. Teleconnections • Observation data: • SLP : Hadley SLP • SST : HadISST • AL & NPO forcings

  21. Thanks For Your Attention ……つづく

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