scholarly journals Assessment of the non-hydrostatic effect on the upper atmosphere using a general circulation model (GCM)

2008 ◽  
Vol 35 (1) ◽  
Author(s):  
Yue Deng ◽  
Arthur D. Richmond ◽  
Aaron J. Ridley ◽  
Han-Li Liu
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Upper Atmosphere

scholarly journals The upper-atmosphere extension of the ICON general circulation model (version: ua-icon-1.0)

2019 ◽  
Vol 12 (8) ◽  
pp. 3541-3569 ◽  
Author(s):  
Sebastian Borchert ◽  
Guidi Zhou ◽  
Michael Baldauf ◽  
Hauke Schmidt ◽  
Günther Zängl ◽  
...  
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Mass Conservation ◽  
Research Area ◽  
Upper Atmosphere ◽  
Lower Atmosphere ◽  
Triangular Grid ◽  
Max Planck ◽  
Dynamical Core

Abstract. How the upper-atmosphere branch of the circulation contributes to and interacts with the circulation of the middle and lower atmosphere is a research area with many open questions. Inertia–gravity waves, for instance, have moved in the focus of research as they are suspected to be key features in driving and shaping the circulation. Numerical atmospheric models are an important pillar for this research. We use the ICOsahedral Non-hydrostatic (ICON) general circulation model, which is a joint development of the Max Planck Institute for Meteorology (MPI-M) and the German Weather Service (DWD), and provides, e.g., local mass conservation, a flexible grid nesting option, and a non-hydrostatic dynamical core formulated on an icosahedral–triangular grid. We extended ICON to the upper atmosphere and present here the two main components of this new configuration named UA-ICON: an extension of the dynamical core from shallow- to deep-atmosphere dynamics and the implementation of an upper-atmosphere physics package. A series of idealized test cases and climatological simulations is performed in order to evaluate the upper-atmosphere extension of ICON.

scholarly journals The upper-atmosphere extension of the ICON general circulation model

2018 ◽  
Author(s):  
Sebastian Borchert ◽  
Guidi Zhou ◽  
Michael Baldauf ◽  
Hauke Schmidt ◽  
Günther Zängl ◽  
...  
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Mass Conservation ◽  
Research Area ◽  
Upper Atmosphere ◽  
Lower Atmosphere ◽  
Triangular Grid ◽  
Max Planck ◽  
Dynamical Core

Abstract. How the upper-atmosphere branch of the circulation contributes to and interacts with the circulation of the middle and lower atmosphere is a research area with many open questions. Inertia-gravity waves, for instance, have moved in the focus of research as they are suspected to be key features in driving and shaping the circulation. Numerical atmospheric models are an important pillar for this research. We use the ICOsahedral Non-hydrostatic (ICON) general circulation model, which is a joint development of the Max Planck Institute for Meteorology (MPI-M) and the German Weather Service (DWD), and provides, e.g., local mass conservation, a flexible grid nesting option and a non-hydrostatic dynamical core formulated on an icosahedral-triangular grid. We extended ICON to the upper atmosphere and present here the two main components of this new configuration named UA-ICON: an extension of the dynamical core from shallow- to deep-atmosphere dynamics, and the implementation of an upper-atmosphere physics package. A series of test cases and climatological simulations show that UA-ICON performs satisfactorily and is in good agreement with the observed global atmospheric circulation.

Supplementary material to "The upper-atmosphere extension of the ICON general circulation model"

2018 ◽  
Author(s):  
Sebastian Borchert ◽  
Guidi Zhou ◽  
Michael Baldauf ◽  
Hauke Schmidt ◽  
Günther Zängl ◽  
...  
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Upper Atmosphere ◽  
Supplementary Material

scholarly journals 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

2015 ◽  
Vol 8 (7) ◽  
pp. 5643-5670 ◽  
Author(s):  
A. V. Koval ◽  
N. M. Gavrilov ◽  
A. I. Pogoreltsev ◽  
E. N. Savenkova
Keyword(s):  
General Circulation Model ◽  
Gravity Waves ◽  
General Circulation ◽  
Middle Atmosphere ◽  
Meridional Circulation ◽  
Circulation Model ◽  
Upper Atmosphere ◽  
Global Circulation Models ◽  
Ozone Fluxes ◽  
Vertical Winds

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.

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