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GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/, Evidence for the Chaotic Origin of Northern Annular
 

Summary: GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/,
Evidence for the Chaotic Origin of Northern Annular
Mode Variability
S. M. Osprey
National Centre for Atmospheric Science, Department of Physics, University
of Oxford, United Kingdom
M. H. P. Ambaum
Department of Meteorology, University of Reading, United Kingdom
Correspondence to S. M. Osprey, Department of Physics, University of Oxford, United King-
dom (s.osprey@physics.ox.ac.uk)
D R A F T June 24, 2011, 2:44pm D R A F T
X - 2 SCOTT M. OSPREY: NAM EXPONENTIAL SPECTRA
Exponential spectra are found to characterize variability of the Northern
Annular Mode (NAM) for periods less than 36 days. This corresponds to the
observed rounding of the autocorrelation function at lags of a few days. The
characteristic persistence timescales during winter and summer is found to
be 5 days for these high frequencies. Beyond periods of 36 days the char-
acteristic decorrelation timescale is 20 days during winter and 6 days in
summer. We conclude that the NAM cannot be described by autoregressive
models for high frequencies; the spectra are more consistent with low-order

  

Source: Ambaum, Maarten - Department of Meteorology, University of Reading

 

Collections: Geosciences