Seasonal and interannual variability of the pressure field and indices of the North Atlantic atmosphere zonal circulation are analysed using historical (1894–1988) observations. It is shown that fluctuations of the index of North Atlantic oscillations (NAO) and that of the eastward transport give evidence of the interannual fluctuations with the typical time scale being 2–7 years. It is shown that the magnitude of interannual NAO index variability exceeds the typical magnitude of seasonal variations, particularly in winter. The time scale of NAO index variations and eastward transport coincides with the typicalEl Niño-southern oscillations (ENSO) temporal scale. The amplitudes of the annual, semi-annual harmonics, and high-frequency fluctuations of the NAO index increase during a typical ENSO event at least by a factor of 2.
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Voskresenskaya, E.N., Polonsky, A.B. Air pressure fluctuations in the North Atlantic and their relationship with El Niño-southern oscillations. Phys. Oceanogr. 4, 275–282 (1993). https://doi.org/10.1007/BF02197626
- Index Variation
- Temporal Scale
- Interannual Variability
- Pressure Field
- North Atlantic Oscillation