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Properties of young contrails - parametrisation based on large-eddy simulations

Unterstrasser, Simon (2016) Properties of young contrails - parametrisation based on large-eddy simulations. Atmospheric Chemistry and Physics (ACP), 16 (4), pp. 2059-2082. Copernicus Publications. ISSN 1680-7316

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Official URL: http://www.atmos-chem-phys.net/16/2059/2016/

Abstract

Contrail–cirrus is probably the largest climate forcing from aviation. The evolution of contrail–cirrus and its radiative impact depends not only on a multitude of atmospheric parameters, but also on the geometric and microphysical properties of the young contrails evolving into contrail–cirrus. The early evolution of contrails (t  <  5 min) is dominated by an interplay of ice microphysics and wake vortex dynamics. Young contrails may undergo a fast vertical expansion due to a descent of the wake vortices and may lose a substantial fraction of their ice crystals due to adiabatic heating. The geometric depth H and total ice crystal number N of young contrails are highly variable and depend on many environmental and aircraft parameters. Both properties, H and N, affect the later properties of the evolving contrail–cirrus, as they control the extent of shear-induced spreading and sedimentation losses. In this study, we provide parametrisations of H and N after 5 min taking into account the effects of temperature, relative humidity, thermal stratification and aircraft type (mass, wing span, fuel burn). The parametrisations rely on a large data set of recent large-eddy simulations of young contrails. They are suited to be incorporated in larger-scale models in order to refine the present-day contrail initialisations by considering the processes that strongly affect the contrail evolution during the vortex phase.

Item URL in elib:https://elib.dlr.de/103196/
Document Type:Article
Title:Properties of young contrails - parametrisation based on large-eddy simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Unterstrasser, SimonDLR, IPAUNSPECIFIED
Date:24 February 2016
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:16
Page Range:pp. 2059-2082
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:Contrail, wake vortex, LES, biofuel
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 > Transport Meteorology
Deposited By: Unterstraßer, Dr. Simon
Deposited On:25 Feb 2016 07:16
Last Modified:02 May 2019 13:59

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