Forcing of the quasi-biennial oscillation from a broad spectrum of atmospheric waves

Details Forcing of the quasi-biennial oscillation from a broad spectrum of atmospheric waves Forcing of the quasi-biennial oscillation from a broad spectrum of atmospheric waves

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29h..86g&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 8, pp. 86-1, CiteID 1245, DOI 10.1029/2002GL014756

Physics

59

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342), Meteorology And Atmospheric Dynamics: Tropical Meteorology, Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

The circulation of the stratosphere, and its influence on the trace constituent distribution, is an important component of the climate system, which must be included in simulations of global climate change. However, the ability to simulate a dominant stratospheric phenomenon, the Quasi-Biennial Oscillation (QBO) in equatorial zonal wind, is an outstanding challenge in climate modeling. Although confined to the tropics, the QBO affects the circulation and the interannual variability of the entire stratosphere, parts of the mesosphere and possibly also of the troposphere. Here we show that the QBO is successfully simulated in a general circulation model (GCM) of the newest generation. Key factors are a sufficient spatial resolution, a realistic simulation of tropical convection, and the consideration of the effects of gravity waves. From this simulation it is inferred that a broad spectrum of atmospheric waves is necessary to generate the QBO in the model.

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