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Effective radiative forcing and rapid adjustments of contrail cirrus

Bickel, Marius and Ponater, Michael and Bock, Lisa and Reineke, Svenja (2019) Effective radiative forcing and rapid adjustments of contrail cirrus. 27. IUGG General Assembly, 8-18 Jul 2019, Montreal, Canada.

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Abstract

Contrail cirrus is regarded to be the largest contributor to aviation climate impact and thus plays an important role in developing strategies towards limiting aviation induced climate change. So far the climate impact relevance of contrails and contrail cirrus was estimated in terms of stratosphere adjusted radiative forcing. It has been shown that the efficacy of stratosphere adjusted radiative forcing of linear contrails in forcing surface temperature is significantly reduced. Thus stratosphere adjusted radiative forcing may be a questionable metric for assessing the climate impact. Here, we present results from global climate model simulations, designed to determine the effective radiative forcing of contrail cirrus, as effective radiative forcing is now considered as a superior metric for inter-comparing contributions to a total climate impact (in this case, for aviation). Effective radiative forcing is found to be significantly lower than the corresponding stratospheric adjusted radiative forcing. For a CO2 increase forcing of comparable magnitude, the reduction of effective radiative forcing in comparison to the stratosphere adjusted forcing is much smaller. Thus the climate impact to be deduced from our simulations is reduced compared to existing radiative forcing estimates. In a subsequent feedback analysis the rapid radiative adjustments, which are physically responsible for the reduced effective radiative forcings, have been determined. A large negative cloud adjustment, due to a loss of natural cirrus cover, is found to be the main driver of the substantial reduction in the contrail cirrus case.

Item URL in elib:https://elib.dlr.de/129731/
Document Type:Conference or Workshop Item (Poster)
Title:Effective radiative forcing and rapid adjustments of contrail cirrus
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bickel, MariusDLR, IPAhttps://orcid.org/0000-0002-7872-3706
Ponater, MichaelDLR, IPAhttps://orcid.org/0000-0002-9771-4733
Bock, LisaDLR, IPAhttps://orcid.org/0000-0001-7058-5938
Reineke, SvenjaDLR, IPAUNSPECIFIED
Date:12 July 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:contrail cirrus, effective radiative forcing, rapid adjustments, feedback analysis
Event Title:27. IUGG General Assembly
Event Location:Montreal, Canada
Event Type:international Conference
Event Dates:8-18 Jul 2019
Organizer:International Union of Geodesy and Geophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Institute of Atmospheric Physics > Earth System Model Evaluation and Analysis
Institute of Atmospheric Physics
Deposited By: Bickel, Marius
Deposited On:22 Oct 2019 14:15
Last Modified:22 Oct 2019 14:15

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