Physics – Geophysics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3608803w&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 8, CiteID L08803
Physics
Geophysics
3
Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Synoptic-Scale Meteorology, Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Theoretical Modeling, Nonlinear Geophysics: Self-Organization
Scientific paper
The eddy-mean flow interaction associated with the North Atlantic Oscillation (NAO) is examined by using the baroclinic wave life cycle experiments. When a sheared zonal flow perturbation akin to the NAO-related dipole wind anomaly is added to the basic state, momentum fluxes due to baroclinic waves tend to reinforce the initial zonal flow dipole in the upper troposphere both for the anticyclonic and cyclonic shears. The eddy feedback is stronger for the anticyclonic shear because the node of the dipole flow is asymmetric about the basic jet, suggesting that the positive NAO is more favored by the eddy feedback. For the zonal wind anomaly with extremely large amplitude, the baroclinic wave breaking cannot efficiently intensify the zonal flow dipole, indicating a self-limitation in the positive eddy feedback to the NAO-like zonal flow anomaly.
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