Modeling studies with QBO: I. Quasi-decadal oscillation

Details Modeling studies with QBO: I. Quasi-decadal oscillation Modeling studies with QBO: I. Quasi-decadal oscillation

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..887m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 8, p. 887-899.

Physics

7

Scientific paper

Quasi-decadal oscillations (QDO) have been observed in the stratosphere and have been linked to the quasi-biennial oscillation (QBO) in the zonal circulation and to the 11-year solar activity cycle. With the use of a 2D version of our numerical spectral model that incorporates Hines' Doppler spread parameterization for gravity waves (GW), we demonstrate that beat periods between 9 and 11 years can be generated by the QBO as it interacts through GW filtering with the annual oscillation (AO) or semi-annual oscillation (SAO). Results are discussed from model runs covering up to 50 years, and our analyses lead to the following conclusions. A QDO is generated in the zonal circulation of the upper mesosphere. The largest signature of the QDO, however, appears in the form of amplitude modulations of the QBO, AO and SAO, and these extend into the lower stratosphere. The downward control that characterizes the QBO apparently comes into play, and the longer time constants for diffusion and radiative loss at lower altitudes facilitate the QDO response. Although excited by the QBO, which is confined to low latitudes, the QDO is shown to extend to high latitudes. The effect is particularly large for a QBO with period around 33 months (near the upper limit of observations), which interacts with the SAO to produce a hemispherically symmetric QDO. (The same dynamical condition also holds for a 28-month QBO.) Our analysis indicates that the QDO is transferred to high latitudes by the meridional circulation, which prominently exhibits this periodicity particularly in the amplitude modulation of the AO.

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