Recent forecast skill for the El Niño/Southern Oscillation

Details Recent forecast skill for the El Niño/Southern Oscillation Recent forecast skill for the El Niño/Southern Oscillation

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25..171g&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 2, p. 171-174

Physics

Geophysics

22

Oceanography: Physical: El Nino, Mathematical Geophysics: Nonlinear Dynamics, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Policy Sciences: Decision Making Under Uncertainty

Scientific paper

We outline a relationship between three slowly varying characteristics of the coupled ocean-atmosphere system in the tropical Pacific: (i) quasi-periodicity, (ii) extended predictability, and (iii) approximate low dimensionality. The Southern Oscillation Index (SOI) and Niño-3 sea surface temperatures characterize climatic variations in the tropical Pacific; these two time series are usually anticorrelated. This low-dimensional characterization suggests that much of the system's seasonal-to-interannual predictability depends on the regular behavior of the two scalar time series under consideration. The predictive skill of two idealized models is studied, showing the strong connection between regularity and predictability. El-Niño/Southern-Oscillation (ENSO) predictability is then assessed for current forecast models. When the periodic component of the ENSO signal is strong, it results in higher forecast skill. This skill decreases when the anti-correlation between SOI and Niño-3 temperature anomalies is lost, as it has been in the first half of this decade.

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