Modes in a continuous spectrum of atmospheric oscillations

Details Modes in a continuous spectrum of atmospheric oscillations Modes in a continuous spectrum of atmospheric oscillations

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1275s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 9, p. 1275-1278

Physics

1

Meteorology And Atmospheric Dynamics: Mesoscale Meteorology, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Synoptic-Scale Meteorology, Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

Atmospheric observational studies reveal synoptic-scale eastward-traveling modes, but barotropic models of the atmosphere do not have free Rossby modes in the discrete spectrum that travel eastward. Nevertheless, we show that eastward-traveling barotropic modes can be excited in the same way as discrete westward-traveling normal-mode Rossby waves. Within a linearized shallow water model, we have examined the response to forcing in individual hemispheres. This response includes eastward-traveling modes that agree well with observations. The study also shows resonant low-frequency responses in the continuous spectrum confined to a single hemisphere (``hemispheric Rossby modes'').

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