Evidence for the chaotic origin of Northern Annular Mode variability - 33andrain's Wx Research Portal - 33andrain Weather Discussion Community Jump to content
Bring Back 1962-63

Evidence for the chaotic origin of Northern Annular Mode variability

Recommended Posts

Evidence for the chaotic origin of Northern Annular Mode variability

 

Authors:  S. M. Osprey and M. H. P. Ambaum

 

Published online:   3rd August, 2011

 

Abstract:

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 characteristic 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 chaos. We also propose that the NAM exhibits regime behaviour, however the nature of this has yet to be identified.

 

Link to full article:  https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2011GL048181

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...