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The climatology of the elevated stratopause events in UA-ICON and the contribution of gravity waves

Authors

Karami,  Khalil
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Eichinger,  Roland
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jacobi,  Christoph
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kuchar,  Ales
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mehrdad,  Sina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Pisoft,  Petr
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sacha,  Petr
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Karami, K., Eichinger, R., Jacobi, C., Kuchar, A., Mehrdad, S., Pisoft, P., Sacha, P. (2023): The climatology of the elevated stratopause events in UA-ICON and the contribution of gravity waves, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0026


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017073
Abstract
The upper boundary of the stratosphere, the stratopause, are sensitive to the increasing concentrations of greenhouse gases (GHG) and are considered an independent and novel indicator of GHG-induced climate change. Therefore, it is of interest to study the characteristics of stratopause and understand the mechanisms influencing it. Understanding the details of elevated stratopause (ES) events using reanalysis has its own limitations as the upper lid of most reanalysis may be below 0.1 hPa. Also, in the presence of the sponge layer in reanalysis to damp upward-propagating waves near the model top to limit reflections from the upper boundary, a detailed study of the role of planetary and gravity waves is complex. Here we employ the UA-ICON model and study the relative contributions of gravity waves and planetary waves in the formation of ES events. The goal of this study is to investigate in detail the climatology of the stratopause and also the elevated stratopause (ES) events occurrence, their main characteristics, and driving mechanisms in the UA-ICON model and compare it with a 16-year climatology (2005-2020) based on Microwave Limb Sounder (MLS) observations. Our preliminary results show that UA-ICON can, in general, realistically simulate the large-scale stratopause properties. While the polar stratopause in the Northern hemisphere midwinter is an excellent match with the MLS observations, the stratopause is approximately 6K and 8K warmer in UA-ICON during spring and autumn equinoxes, respectively. In the Southern hemisphere, UA-ICON stratopause temperatures are up to 10 K warmer in the polar regions.