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Is the North Atlantic Oscillation a random walk?

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Stephenson, D. B., V. Pavan and R. Bojariu

Editorial: Royal Meteorological Society, International Journal of Climatology, 20, p.1-18, 2000.

Rezumat:

The North Atlantic Oscillation is a major mode of large-scale climate variability which contains a broad spectrum of variations. There are substantial contributions from short term 2-5 year variations, which have clearly marked teleconnections. Decadal trends are also apparent in the historical historical record of the North Atlantic Oscillation and may be due to either stochastic or deterministic processes. Evidence is presented that suggests the NAO exhibits „long-range” dependence having winter values residually correlated over many years. Several simple stochastic models have been used to fit the NAO SLP wintertime index over the period 1864-1998, and their performance at predicting the following year has been assessed. Long-range fractionally integrated noise provides a better fit than does either stationary red noise or a non-stationary random walk.

Cuvinte cheie: North Atlantic Oscillation, short term 2-5 year variations, stochastic models