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Linear Contributions of Different Time Scales to Teleconnectivity

Athanasiadis, P. J. and Ambaum, M. H. P. (2009) Linear Contributions of Different Time Scales to Teleconnectivity. Journal of Climate, 22 (13). pp. 3720-3728. ISSN 1520-0442

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To link to this article DOI: 10.1175/2009jcli2707.1

Abstract/Summary

The contributions of different time scales to extratropical teleconnections are examined. By applying empirical orthogonal functions and correlation analyses to reanalysis data, it is shown that eddies with periods shorter than 10 days have no linear contribution to teleconnectivity. Instead, synoptic variability follows wavelike patterns along the storm tracks, interpreted as propagating baroclinic disturbances. In agreement with preceding studies, it is found that teleconnections such as the North Atlantic Oscillation (NAO) and the Pacific–North America (PNA) pattern occur only at low frequencies, typically for periods more than 20 days. Low-frequency potential vorticity variability is shown to follow patterns analogous to known teleconnections but with shapes that differ considerably from them. It is concluded that the role, if any, of synoptic eddies in determining and forcing teleconnections needs to be sought in nonlinear interactions with the slower transients. The present results demonstrate that daily variability of teleconnection indices cannot be interpreted in terms of the teleconnection patterns, only the slow part of the variability.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:4437
Uncontrolled Keywords:north-atlantic oscillation; 500-mb height fluctuations; hemisphere winter; intermediate; variability; reanalysis; patterns; field; model; long
Publisher:American Meteorological Society

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