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Reassessing properties and radiative forcing of contrail cirrus using a climate model

Bock, Lisa and Burkhardt, Ulrike (2016) Reassessing properties and radiative forcing of contrail cirrus using a climate model. Journal of Geophysical Research: Atmospheres, pp. 1-20. Wiley. DOI: 10.1002/2016JD025112 ISSN 0148-0227

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2016JD025112/full

Abstract

Contrail cirrus is the largest known component contributing to the radiative forcing associated with aviation. Despite major advances simulating contrail cirrus, their microphysical and optical properties and the associated radiative forcing remain largely uncertain. We use a contrail cirrus parameterization in a global climate model which was extended to include a microphysical two-moment scheme. This allows a more realistic epresentation of microphysical processes, such as deposition and sedimentation, and therefore of the microphysical and optical properties of contrail cirrus. The simulated contrail microphysical and optical properties agree well with in situ and satellite observations. As compared to estimates using an older version of the contrail cirrus scheme, the optical depth of contrail cirrus is significantly higher, particularly in regions with high air traffic density, due to high ice crystal number concentrations on the main flight routes. Nevertheless, the estimated radiative forcing for the year 2002 supports our earlier results. The global radiative forcing of contrail cirrus for the year 2006 is estimated to be 56mW/m2. A large uncertainty of the radiative forcing estimate appears to be connected with the, on average, very small ice crystal radii simulated in the main air traffic areas, which make the application of a radiative transfer parameterization based on geometric optics questionable.

Item URL in elib:https://elib.dlr.de/105975/
Document Type:Article
Title:Reassessing properties and radiative forcing of contrail cirrus using a climate model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bock, LisaDLR, IPAhttps://orcid.org/0000-0001-7058-5938
Burkhardt, UlrikeDLR, IPAUNSPECIFIED
Date:27 August 2016
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/2016JD025112
Page Range:pp. 1-20
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:contrail cirrus; contrails in climate model; radiative forcing of contrails
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
Deposited By: Bock, Lisa
Deposited On:07 Sep 2016 07:15
Last Modified:08 Mar 2018 18:32

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