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The Climatology of Elevated Stratopause Events in the UA-ICON Model and the Contribution of Gravity Waves

Khalil, Karami and Borchert, Sebastian and Eichinger, Roland and Jacobi, Christoph and Kuchar, Ales and Mehrdad, Sina and Pisoft, Petr and Sacha, Petr (2023) The Climatology of Elevated Stratopause Events in the UA-ICON Model and the Contribution of Gravity Waves. Journal of Geophysical Research: Atmospheres, 128 (7), e2022JD037907. Wiley. doi: 10.1029/2022JD037907. ISSN 2169-897X.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JD037907


The climatologies of the stratopause height and temperature in the UA-ICON model are examined by comparing them to 17-years (2005–2021) of Microwave Limb Sounder (MLS) observations. In addition, the elevated stratopause (ES) event occurrence, their main characteristics, and driving mechanisms in the UA-ICON model are examined using three 30-year time-slice experiments. While UA-ICON reasonably simulates the large-scale stratopause properties similar to MLS observations, at polar latitudes in the Southern Hemisphere the stratopause is ∼8 K warmer and ∼3 km higher than observed. A time lag of about two months also exists in the occurrence of the tropical semiannual oscillation of the stratopause compared to the observations. ES events occur in ∼20% of the boreal winters, after major sudden stratospheric warmings (SSWs). Compared to the SSWs not followed by ES events (SSW-only), the ES events are associated with the persistent tropospheric forcing and prolonged anomalies of the stratospheric jet. Our modeling results suggest that the contributions of both gravity waves (GW)s and resolved waves are important in explaining the enhanced residual circulation following ES events compared to the SSW-only events but their contributions vary through the lifetime of ES events. We emphasize the role of the resolved wave drag in the ES formation as in the sensitivity test when the non-orographic GW drag is absent, the anomalously enhanced resolved wave forcing in the mesosphere gives rise to the formation of the elevated stratopause at about 85 km.

Item URL in elib:https://elib.dlr.de/194783/
Document Type:Article
Title:The Climatology of Elevated Stratopause Events in the UA-ICON Model and the Contribution of Gravity Waves
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Khalil, KaramiUniversität Leipzig, LeipzigUNSPECIFIEDUNSPECIFIED
Eichinger, RolandDLR, IPAhttps://orcid.org/0000-0001-6872-5700UNSPECIFIED
Jacobi, ChristophUniversität Leipzig, LeipzigUNSPECIFIEDUNSPECIFIED
Kuchar, AlesUniversität Leipzig, Leipzighttps://orcid.org/0000-0002-3672-6626UNSPECIFIED
Mehrdad, SinaUniversität Leipzig, LeipzigUNSPECIFIEDUNSPECIFIED
Pisoft, PetrKarls Univ. Prag, Tschechische Republikhttps://orcid.org/0000-0002-5034-9169UNSPECIFIED
Sacha, PetrKarls Univ. Prag, Tschechische RepublikUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e2022JD037907
Keywords:Stratopause, Gravity Waves, Dynamics, Model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere, R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Eichinger, Roland
Deposited On:24 Apr 2023 07:37
Last Modified:15 May 2023 12:12

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