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Interactive ozone induces a negative feedback in CO2 driven climate change simulations

Dietmüller, Simone and Ponater, Michael and Sausen, Robert (2014) Interactive ozone induces a negative feedback in CO2 driven climate change simulations. Journal of Geophysical Research: Atmospheres, 119, pp. 1796-1805. Wiley. DOI: 10.1002/2013/D020575 ISSN 0148-0227

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2013JD020575/pdf

Abstract

Interactively coupled climate chemistry models (CCMs) extend the number of feedback mechanisms in climate change simulations by including chemical feedback. In this study the radiative feedback from ozone changes on climate response and climate sensitivity is quantified for a series of simulations driven by CO2 increases on top of a present-day reference concentration level. Other possibly relevant feedback via atmospheric chemistry, e.g., via CH4 and N2O, is not fully quantified in the CCM setup as their concentrations are essentially fixed at the surface. In case of a CO2-doubling simulation, the ozone feedback reduces the climate sensitivity parameter by 3.4%, from 0.70 K/(W m−2) without interactive chemistry to 0.68 K/(Wm−2). In case of a 4*CO2 simulation, the reduction of the climate sensitivity parameter increases to 8.4%. An analysis of feedback reveals that the negative feedback of stratospheric ozone and the associated negative feedback change in stratospheric water vapor are mainly responsible for this damping. The feedback from tropospheric ozone changes is positive but much smaller. The nonlinearity in the climate sensitivity damping with increased CO2 concentrations is shown to be due to nonlinear feedback of ozone and stratospheric water vapor.

Item URL in elib:https://elib.dlr.de/88586/
Document Type:Article
Title:Interactive ozone induces a negative feedback in CO2 driven climate change simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dietmüller, SimoneDLR, IPAUNSPECIFIED
Ponater, MichaelDLR, IPAUNSPECIFIED
Sausen, RobertDLR, IPAUNSPECIFIED
Date:2014
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:119
DOI :10.1002/2013/D020575
Page Range:pp. 1796-1805
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:climate sensitivity, ozone feedback, chemical feedback, stratospheric water vapor
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 - Projekt Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Ponater, Dr.rer.nat. Michael
Deposited On:24 Mar 2014 08:07
Last Modified:31 Jul 2019 19:45

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