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On the sensitivity of annular mode dynamics to stratospheric radiative timescales

Charlton-Perez, A. J. and O'Neill, A. (2009) On the sensitivity of annular mode dynamics to stratospheric radiative timescales. Journal of Climate, 23 (2). pp. 476-484. ISSN 1520-0442

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To link to this item DOI: 10.1175/2009JCLI2995.1


Long decorrelation timescales of the annular mode are observed in the lower stratosphere. This study uses a simple dynamical model, which has been used extensively to study stratosphere-troposphere coupling, to investigate the origin of the long dynamical timescales. Several long runs of the model are completed, with different imposed thermal damping timescales in the stratosphere. The dynamical timescales of the annular mode are found to be largely insensitive to the input thermal damping timescales, producing similar dynamical timescales in all cases below 50hPa. This result suggests that the hypothesis that long timescales in the lower stratosphere are due to long radiative timescales in this region is false.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:1582
Publisher:American Meteorological Society

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