Influence of the stratosphere on climate projections with HadGEM2
(2012)
The Effect of Climate Change on the Variability of the Northern Hemisphere Stratospheric Polar Vortex
(2012)
The effect of a well resolved stratosphere on surface climate: Differences between CMIP5 simulations with high and low top versions of the Met Office climate model
J. Clim. (2012)
Evidence for the chaotic origin of Northern Annular Mode variability
Geophysical Research Letters 38:15 (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. Copyright 2011 by the American Geophysical Union.Stratosphere-resolving Models in CMIP5
Clivar Exchanges International CLIVAR Project Office 16 (2011) 2