Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1307t&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 9, p. 1307-1310
Physics
45
Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition
Scientific paper
Simulation of the equatorial stratospheric quasi-biennial oscillation (QBO) is accomplished, using a T42-horizontal resolution, 60-layer general circulation model (GCM), with a scheme of moist convective adjustment. In a previous paper, we succeeded in simulating a QBO in a T21 GCM using a damping time of 20 days for the maximum wavenumber in the fourth-order horizontal diffusion. It was noted that the damping time is a factor of 10 larger than that employed in standard GCMs. In this paper, we explore whether it is possible to use a smaller damping term by going to a finer horizontal resolution. We successfully simulated a QBO using a damping time of 4 days. The period of the simulated QBO is 800 days, being almost the same as that observed. The amplitude of the zonal-wind oscillation is 20 ms-1. However, this is achieved at the expense of much noiser precipitation and the damping time is still a factor of 7 larger than the standard values.
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