Seasonality of synoptic eddy feedback and the AO/NAO

Details Seasonality of synoptic eddy feedback and the AO/NAO Seasonality of synoptic eddy feedback and the AO/NAO

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3221708p&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 21, CiteID L21708

Mathematics

Logic

6

Global Change: Atmosphere (0315, 0325), Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes

Scientific paper

In this paper, by using a dynamic model with synoptic eddy and low-frequency flow (SELF) interaction, we show that the SELF feedback is of significant importance for the formation of the AO/NAO in both winter and summer. Although background storm activity is significantly weaker in summer than that in winter, the positive SELF feedback associated with the AO/NAO mode in summer can be as strong as that in winter. The seasonal variations of the AO/NAO patterns are found to resemble those of the leading singular modes simulated by a linear dynamic system with the SELF interaction in different seasons, and the seasonal shifts in spatial patterns of the AO/NAO are the result of the seasonal changes in climatological basic state and synoptic eddy activity.

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