Evolution of the ENSO signal over the tropical Pacific-Atlantic domain

Physics

Scientific paper

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Oceanography: Physical: Enso (4922), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: Physical: Deep Recirculations, Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Climate Dynamics (0429, 3309)

Scientific paper

Space-time evolution of the dominant El Niño-Southern Oscillation (ENSO) signal in the tropical eastern Pacific-Atlantic domain is investigated (1979-2004). Multi-Taper-Method, Singular Value Decomposition (MTM/SVD) and complex empirical orthogonal functions (CEOF) are applied to four variables: sea surface temperature (SST), upper ocean heat storage (HST), zonal surface wind (ZSW), and sea level pressure (SLP). Anomalous evolution for all variables find a dominant ENSO signal (3.4-5.7 years band period) composed of mixed standing modes and propagating modes. The latter evolve eastward from the eastern Pacific Ocean, into the tropical Atlantic basin at ~20 cm s-1. As such, peak signals in the equatorial Atlantic lag that in the eastern equatorial Pacific by ~12-18 months. The slow SST/SLP coupled wave propagating through the Caribbean Sea resembles the global ENSO wave identified by White and Cayan (2000).

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