Generating QBO in WACCM using the parameterized inertial gravity waves

Details Generating QBO in WACCM using the parameterized inertial gravity waves Generating QBO in WACCM using the parameterized inertial gravity waves

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1711x&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1711

Physics

[3334] Atmospheric Processes / Middle Atmosphere Dynamics

Scientific paper

In this work we generalize the gravity wave parameterization scheme currently used in WACCM, which is based upon Lindzen's linear saturation theory, to include a spectrum of inertial gravity waves with horizontal wavelength at 1000 km. In WACCM simulations with the new gravity wave parameterization and the standard WACCM horizontal and vertical resolutions, the stratospheric zonal winds exhibit a strong oscillation around the equator with downward propagation of the wind reversals. The period of the oscillation is dependent on the strength of the gravity wave forcing. Therefore, quasi-biennial oscillation can be internally generated with the proper selection of drag efficiency of the gravity waves. The oscillation thus generated are compared with observed QBO. These experiments demonstrate the need to parameterize inertial gravity waves for generating QBO in General Circulation Models (GCMs).

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