Numerical simulation of the response of general circulation of the middle atmosphere to spatial inhomogeneities of orographic waves |
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| Authors: | N M Gavrilov A V Koval’ A I Pogorel’tsev E N Savenkova |
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| Institution: | 1. St. Petersburg State University, ul. Ul’yanovskaya 1, St. Petersburg, 198504, Russia
2. Russian State Hydrometeorological Institute, Malookhtinskii pr. 98, St. Petersburg, 195106, Russia
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| Abstract: | We have developed a parameterization of the dynamical and thermal effects of stationary orographic waves (SOWs) generated by the earth’s surface topography and included it into the general circulation model of the middle and upper atmosphere. We have analyzed the sensitivity of atmospheric general circulation at tropospheric to thermospheric altitudes to the impact of SOWs propagating from the troposphere. Changes in atmospheric circulation due to variations in the SOW generation and propagation have been considered for different seasons. It has been shown that, during solstices, the main dynamical and thermal impacts the middle atmosphere of winter hemispheres, where the SOW-induced changes in the velocity of zonal circulation can reach 30%. During equinoxes, the SOW impact is distributed more homogeneously between the Northern and Southern hemispheres, and the relative changes in the velocity of zonal circulation of the middle atmosphere may constitute 10%. |
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