Preprints
https://doi.org/10.5194/gmdd-8-5643-2015
https://doi.org/10.5194/gmdd-8-5643-2015

Submitted as: model experiment description paper 21 Jul 2015

Submitted as: model experiment description paper | 21 Jul 2015

Review status: this preprint was under review for the journal GMD but the revision was not accepted.

Experiments on sensitivity of meridional circulation and ozone flux to parameterizations of orographic gravity waves and QBO phases in a general circulation model of the middle atmosphere

A. V. Koval1, N. M. Gavrilov1, A. I. Pogoreltsev2, and E. N. Savenkova1 A. V. Koval et al.
  • 1Atmospheric Physics Department, Saint-Petersburg State University, Saint-Petersburg, Russia
  • 2Meteorological Forecast Department, Russian State Hydrometeorological University, Saint-Petersburg, Russia

Abstract. Many atmospheric global circulation models have large biases in predicting meridional and vertical winds and fluxes of gas species in remote regions such as the middle and upper atmosphere. In this study, we make sensitivity simulations to recognize the role of vital processes associated with dynamical coupling between different atmospheric layers, namely dynamical and thermal impacts of mesoscale orographic gravity waves (OGWs) generated by the Earth's topography and changes from the easterly to westerly QBO phases in the lower equatorial atmosphere. We improved parameterizations of OGW dynamical and thermal effects and QBO flows and implemented them into a general circulation model of the middle and upper atmosphere used in different countries. With this model, we study the sensitivity of meridional circulation and vertical velocity to stationary OGWs and to changes in QBO phases at altitudes up to 100 km in January. We also considered respective changes in vertical ozone fluxes in the atmosphere. Accounting stationary OGW effects gives changes up to 40 % in the meridional velocity and associated ozone fluxes in the stratosphere. Transitions from the easterly to westerly QBO phase in tropics may significantly alter the meridional and vertical circulation of the middle atmosphere at middle and high latitudes: up to 60 % from the peak respective values. The improved parameterizations of OGW and QBO effects have impacts on other features of the general circulation model, improving the simulation of general circulation, planetary and tidal wave coupling in the lower, middle and upper atmosphere.

A. V. Koval et al.

 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

A. V. Koval et al.

A. V. Koval et al.

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Short summary
We implemented improved parameterizations of orographic gravity wave dynamical and thermal effects and QBO flows into a general circulation model and study the sensitivity of meridional circulation and vertical velocity to the parameterizations at altitudes up to 100km. Stationary OGW effects gives changes up to 40% in the meridional velocity and associated ozone fluxes in the stratosphere. Transitions from the easterly to westerly QBO phase may alter meridional and vertical velocities by 60%.