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Modelling of the dynamical and ozone interactions in the polar stratosphere with ICON-ART

Wang, Shaoyin

Abstract (englisch):

Models with a well-represented stratosphere have been shown to increase the predictability on weather and climate scales through stratosphere-troposphere coupling. However, stratospheric phenomena, such as the Quasi-biennial Oscillation (QBO) or stratospheric ozone, are still poorly represented in current atmospheric models. This study characterizes and improves stratospheric simulations with the next generation weather/climate model ICON-ART, and gives insights into the dynamical and chemical (stratospheric ozone) interactions in the polar stratosphere.
The climatology of a low resolution version of ICON-ART is examined and validated against ERA-Interim data. The sub-grid scale orographic (SSO) gravity wave drag is found unconstrained in the upper stratosphere, leading to warm biases in the Northern Hemisphere (NH) winter polar stratosphere. After reducing the SSO gravity wave drag, the modelled NH polar stratosphere has a more realistic mean state. At a low resolution, the model also fails to simulate the QBO-like oscillation that is observed in the equatorial zonal wind and is dominated by easterlies.
In order to explore dynamical interactions between the stratospheric zonal winds in the tropics and the polar stratosphere, a QBO-like oscillation is imposed in ICON by relaxation using ERA-Interim winds (QBO-relaxation). ... mehr

Volltext §
DOI: 10.5445/IR/1000100114
Veröffentlicht am 25.11.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Hochschulschrift
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000100114
HGF-Programm 12.04.03 (POF III, LK 01) Stratospheric Ozone and Climate Change
Verlag Karlsruher Institut für Technologie (KIT)
Umfang 139 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Prüfungsdatum 25.10.2019
Schlagwörter ICON-ART, stratospheric ozone, QBO, modelling, atmospheric waves, planetary waves, stratosphere
Referent/Betreuer Braesicke, P.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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