Quasi-decadal and inter-decadal climate fluctuations in the Pacific Ocean from a CGCM

Details Quasi-decadal and inter-decadal climate fluctuations in the Pacific Ocean from a CGCM Quasi-decadal and inter-decadal climate fluctuations in the Pacific Ocean from a CGCM

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207710t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 7, CiteID L07710

Physics

4

Global Change: Global Climate Models (3337, 4928), Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215), Oceanography: Physical: Air/Sea Interactions (0312, 3339), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: Physical: Enso (4922)

Scientific paper

Diagnostic analyses in the Pacific, have revealed distinct quasi-decadal (QD) and inter-decadal (ID) climate fluctuations with coherent varying patterns of sea surface temperature (SST) and sea level pressure (SLP) anomalies. From a 200-year CGCM simulation, distinct low-frequency fluctuations are also obtained: QD (i.e., 8-12 years period band) and ID (i.e., 18-25 years period band). Traced modeled QD evolution reveals equatorial SST anomalies resembling ENSO, while tropical recharge/discharge mechanisms seem to be operating. The traced modeled ID evolution reveals high latitudes spatially coherent patterns, with maximum SST anomalies in the vicinity of the subarctic frontal zone (SAFZ) and subtropical gyres through advection. Contrary to QD SST anomalies, the modeled ID SST anomalies peak away from the equator as observed. QD fluctuations may then be viewed as low-frequency ENSO phenomena, while ID fluctuations may set-up thermal background modulating frequency and intensity of ENSO.

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