On the presence of annular variability in an aquaplanet model

Details On the presence of annular variability in an aquaplanet model On the presence of annular variability in an aquaplanet model

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3205701w&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 5, CiteID L05701

Physics

5

Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Global Climate Models (1626, 4928)

Scientific paper

Annular mode in the extratropical atmosphere, whether it is dynamically reasonable concept, is examined in the so-called aquaplanet general circulation model. Standard analyses of the empirical orthogonal function (EOF) and one-point correlation to the low-frequency surface pressure anomaly yield results similar to previous studies: the dominant annular mode in EOF but more non-annular distribution in the correlation maps, leading to a difficulty to argue whether the annular structure is a statistical artifact. Similar analyses to the upper-tropospheric streamfunction are, however, able to successfully distinguish the annular mode from a slowly propagating, wavenumber-five (m = 5) disturbance, both of which are forced by high-frequency eddies. Since the amplitude of the m = 5 waves is weakly interrelated to the annular mode, snapshots of the annular mode extreme tend to accompany large non-annular components. In the aquaplanet experiment with zonally varying boundary condition involved, the annular mode in streamfunction becomes more prevailing, in which the low-frequency eddy itself, in addition to the high-frequency eddies, drives the zonal-mean wind anomaly.

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