Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations

Friedel, Marina; Chiodo, Gabriel; Muthers, Stefan; Anet, Julien; Stenke, Andrea; Peter, Thomas

doi:10.5194/egusphere-egu2020-9118

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-20215

Publication type:	Conference poster
Type of review:	Peer review (abstract)
Title:	Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations
Authors:	Friedel, Marina Chiodo, Gabriel Muthers, Stefan Anet, Julien Stenke, Andrea Peter, Thomas
et. al:	No
DOI:	10.5194/egusphere-egu2020-9118 10.21256/zhaw-20215
Conference details:	EGU General Assembly 2020, Online, 4-8 May 2020
Issue Date:	4-May-2020
Publisher / Ed. Institution:	European Geosciences Union
Language:	English
Subject (DDC):	551: Geology and hydrology
Abstract:	Arctic stratospheric ozone has been shown to exert a statistically significant influence on Northern Hemispheric surface climate. This suggests that Arctic ozone is not only passively responding to dynamical variability in the stratosphere, but actively feeds back into the circulation through chemical and radiative processes. However, the extent and causality of the chemistry-dynamics coupling is still unknown. Since many state-of-the-art climate models lack a sufficient representation of ozone-dynamic feedbacks, a quantification of this coupling can be used to improve intra-seasonal weather and long-term climate forecasts. We assess the importance of the ozone-dynamics coupling by performing simulations with and without interactive chemistry in two Chemistry Climate Models. The chemistry-dynamics coupling was examined in two different sets of time-slice simulations: one using pre-industrial, and one using year-2000 boundary conditions. We focus on the impact of sudden stratospheric warmings (SSW) and strong vortex events on stratosphere-troposphere coupling, since these go along with strong ozone anomalies and therefore an intensified ozone feedback. We compare the runs with and without interactive chemistry. For pre-industrial conditions, simulations without interactive ozone show a more intense and longer lasting surface signature of SSWs compared to simulations with interactive chemistry. Conversely, for year-2000 conditions, the opposite effect is found: interactive chemistry amplifies the surface signature of SSWs. Following these results, atmospheric CFC concentrations, which differ greatly in the pre-industrial and year-2000 runs, determine the sign of the ozone-circulation feedback, and thus have a strong impact on chemistry-climate coupling. Implications for modeling of stratosphere-troposphere coupling and future projections are discussed.
URI:	https://digitalcollection.zhaw.ch/handle/11475/20215
Fulltext version:	Published version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	School of Engineering
Organisational Unit:	Centre for Aviation (ZAV)
Appears in collections:	Publikationen School of Engineering

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Friedel, M., Chiodo, G., Muthers, S., Anet, J., Stenke, A., & Peter, T. (2020, May 4). Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations. EGU General Assembly 2020, Online, 4-8 May 2020. https://doi.org/10.5194/egusphere-egu2020-9118

Friedel, M. et al. (2020) ‘Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations’, in EGU General Assembly 2020, Online, 4-8 May 2020. European Geosciences Union. Available at: https://doi.org/10.5194/egusphere-egu2020-9118.

M. Friedel, G. Chiodo, S. Muthers, J. Anet, A. Stenke, and T. Peter, “Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations,” in EGU General Assembly 2020, Online, 4-8 May 2020, May 2020. doi: 10.5194/egusphere-egu2020-9118.

FRIEDEL, Marina, Gabriel CHIODO, Stefan MUTHERS, Julien ANET, Andrea STENKE und Thomas PETER, 2020. Coupling of Arctic ozone and stratospheric dynamics and its influence on surface climate : the role of CFC concentrations. In: EGU General Assembly 2020, Online, 4-8 May 2020. Conference poster. European Geosciences Union. 4 Mai 2020

Friedel, Marina, Gabriel Chiodo, Stefan Muthers, Julien Anet, Andrea Stenke, and Thomas Peter. 2020. “Coupling of Arctic Ozone and Stratospheric Dynamics and Its Influence on Surface Climate : The Role of CFC Concentrations.” Conference poster. In EGU General Assembly 2020, Online, 4-8 May 2020. European Geosciences Union. https://doi.org/10.5194/egusphere-egu2020-9118.

Friedel, Marina, et al. “Coupling of Arctic Ozone and Stratospheric Dynamics and Its Influence on Surface Climate : The Role of CFC Concentrations.” EGU General Assembly 2020, Online, 4-8 May 2020, European Geosciences Union, 2020, https://doi.org/10.5194/egusphere-egu2020-9118.