Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 117, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011JD016778
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Funding
- Chinese Academy of Sciences [KJCX2-EW-J01, KZCX2-EW-QN509]
- National Natural Science Foundation of China [41174132, 40804035, 41121003, 41025016]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201025]
- Fundamental Funds for the Central Universities
- Program for New Century Excellent Talents in University [NCET-08-0523]
- NCAR High Altitude Observatory
- National Science Foundation CEDAR [ATM-0535466, ATM-0836386]
- NASA LWS [NNX09AJ83G]
- National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0836386] Funding Source: National Science Foundation
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In this work we extend the gravity wave parameterization scheme currently used in the Whole Atmosphere Community Climate Model (WACCM), which is based upon Lindzen's linear saturation theory, by including the Coriolis effect to better describe the inertia-gravity waves (IGW). We perform WACCM simulations to study the generation of equatorial oscillations of the zonal mean zonal winds by including a spectrum of IGWs, and the parametric dependence of the wind oscillation on the IGWs and the effect of the new scheme. These simulations demonstrate that the parameterized IGW forcing from the standard and the new scheme are both capable of generating equatorial wind oscillations with a downward phase progression in the stratosphere using the standard spatial resolution settings in the current model. The period of the oscillation is dependent on the strength of the IGW forcing, and the magnitude of the oscillation is dependent on the width of the wave spectrum. The new parameterization affects the wave breaking level and acceleration rates mainly through changing the critical level. The quasi-biennial oscillations (QBO) can be internally generated with the proper selection of the parameters of the scheme. The characteristics of the wind oscillations thus generated are compared with the observed QBO. These experiments demonstrate the need to parameterize IGWs for generating the QBO in General Circulation Models (GCMs).
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