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Stratospheric ozone causes a negative feedback in CO2-driven climate change simulations

Dietmüller, Simone and Ponater, Michael and Dameris, Martin and Sausen, Robert (2015) Stratospheric ozone causes a negative feedback in CO2-driven climate change simulations. Common Future under Climate Change (CFCC) 2015, 7. - 10. Juli 2015, Paris, Frankreich.

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Official URL: http://cfcc.event.y-congress.com/ScientificProcess/Schedule/index.html?setLng=en#

Abstract

Ozone has been considered mainly as a contributor to climate change in terms of radiative forcing. However, it is also providing a radiative feedback when climate change is induced by, for example, a radiative forcing from CO2 increase. Interactively coupled chemistry-climate models can be used to identify and quantify this feedback. In a set of simulations forced by CO2 increase of different strength we find a negative ozone radiative feedback, which reduces the climate sensitivity compared to a model system where the ozone distribution is prescribed. Stratospheric ozone is more important than tropospheric ozone for this chemical feedback. The feedback mechanisms mainly works through intensification of the Brewer-Dobson circulation as sea surface temperature increases. The stratospheric water vapour feedback is modified by interaction with the ozone feedback, becoming less positive than in simulations with fixed ozone. Hence, a negative ozone feedback and a reduced water vapour feedback overlap constructively in CO2-driven simulations with interactive ozone, giving a global sea surface temperature response that is 4 to 10% smaller than in a corresponding simulation without interactive chemistry.

Item URL in elib:https://elib.dlr.de/97123/
Document Type:Conference or Workshop Item (Poster)
Title:Stratospheric ozone causes a negative feedback in CO2-driven climate change simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dietmüller, SimoneDLR, IPAUNSPECIFIED
Ponater, MichaelDLR, IPAUNSPECIFIED
Dameris, MartinDLR, IPAUNSPECIFIED
Sausen, RobertDLR, IPAUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:ozone radiative feedback
Event Title:Common Future under Climate Change (CFCC) 2015
Event Location:Paris, Frankreich
Event Type:international Conference
Event Dates:7. - 10. Juli 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
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:09 Jul 2015 16:54
Last Modified:31 Jul 2019 19:53

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