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How UTLS processes can affect climate sensitivity in global models including interactive chemistry

Dietmüller, Simone and Ponater, Michael and Rieger, Vanessa (2018) How UTLS processes can affect climate sensitivity in global models including interactive chemistry. The UTLS: Current Status and Emerging Challenges, 5.-8. Feb. 2018, Mainz, Germany.

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Official URL: https://converia.uni-mainz.de/frontend/index.php?folder_id=359

Abstract

Occurence of a negative ozone radiative feedback has been demonstrated in CO2-driven global warming simulations with coupled chemistry climate models (CCMs). In some CCMs, this ozone feedback induces a substantial change (reduction) of the climate sensitivity to CO2 increase, while in others the impact on climate sensitivity in negligible. Interaction between dynamics, transport, and radiation in the UTLS appears to be the key for understanding model differences. An important detail is the radiative feedback of decreasing ozone concentrations in the lowermost tropical stratosphere on tropopause temperature and stratospheric water vapor, which is apparently of different strength is different CCMs. However, the enhancement of tropical upwelling in response to surface warming, leading to increased transport of ozone-poor tropospheric air into the stratosphere, may also differ from model to model. We also address evidence from a CCM experiment indicating that non-CO2 forcings may induce significantly different process chains in the UTLS (compared to CO2-driven simulations), adding on the complexity of the role of UTLS in Earth system dynamics.

Item URL in elib:https://elib.dlr.de/119038/
Document Type:Conference or Workshop Item (Poster)
Title:How UTLS processes can affect climate sensitivity in global models including interactive chemistry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dietmüller, SimoneDLR, IPAUNSPECIFIED
Ponater, MichaelDLR, IPAhttps://orcid.org/0000-0002-9771-4733
Rieger, VanessaDLR, IPAhttps://orcid.org/0000-0002-7328-5102
Date:2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:climate sensitivity, interactive chemistry, ozone feedback, stratospheric water vapour
Event Title:The UTLS: Current Status and Emerging Challenges
Event Location:Mainz, Germany
Event Type:international Conference
Event Dates:5.-8. Feb. 2018
Organizer:SPARC, Johannes-Gutenberg-Universität Mainz
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Verkehrsentwicklung und Umwelt II (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Ponater, Dr.rer.nat. Michael
Deposited On:21 Feb 2018 12:11
Last Modified:31 Jul 2019 20:16

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