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The Initial Composition of Jet Condensation Trails

Kärcher, B. and Peter, T. and Biermann, M. and Schumann, U. (1996) The Initial Composition of Jet Condensation Trails. Journal of the Atmospheric Sciences, 53, pp. 3066-3083. doi: 10.1175/1520-0469(1996)053<3066:TICOJC>2.0.CO;2.


Official URL: http://ams.allenpress.com/perlserv/?request=get-archive&issn=1520-0469&volume=53


Physicochemical processes that generate and transform aerosols in jet aircraft plumes are discussed on the basis of theoretical models and recent observations of young contrails in the upper troposphere. The initial evolution of optical depth and ice water content under threshold contrail formation conditions is studied. Constrained by the measurements, a lower bound is deduced for the number density of ice crystals initially present in contrails. This bound serves as a visibility criterion for young contrails. An analysis of the primary contrail particles (aqueous solution droplets nucleated in situ, emitted insoluble combustion aerosols, and entrained background aerosols) reveals that only soot must he involved as ice forming nuclei if the visibility criterion is to be fulfilled. Possible activation pathways of the soot aerosols are investigated, including an analysis of their wetting behavior and droplet scavenging and heterogeneous nucleation properties. To support these investigations, results of laboratory experiments concerning contact angles of acidic solution droplets on carbonaceous surfaces and the freezing probability of sulfuric acid tetrahydrate are presented. Assuming that the soot particles acquire a liquid coating, heterogeneous freezing rates and their sensitivity on important parameters are studied.

Item URL in elib:https://elib.dlr.de/32267/
Document Type:Article
Title:The Initial Composition of Jet Condensation Trails
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kärcher, B.Univ. MünchenUNSPECIFIED
Peter, T.MPI für Chemie, MainzUNSPECIFIED
Biermann, M.MPI für Plasmaphysik, GarchingUNSPECIFIED
Journal or Publication Title:Journal of the Atmospheric Sciences
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 3066-3083
Keywords:contrail, particles, aircraft emissions, cloud physics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: DLR-Beauftragter, elib
Deposited On:29 Jan 2008
Last Modified:31 Jul 2019 19:17

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