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contributor authorKärcher, B.
contributor authorPeter, Th
contributor authorBiermann, U. M.
contributor authorSchumann, U.
date accessioned2017-06-09T14:34:09Z
date available2017-06-09T14:34:09Z
date copyright1996/11/01
date issued1996
identifier issn0022-4928
identifier otherams-21861.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158247
description abstractPhysicochemical 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.
publisherAmerican Meteorological Society
titleThe Initial Composition of Jet Condensation Trails
typeJournal Paper
journal volume53
journal issue21
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1996)053<3066:TICOJC>2.0.CO;2
journal fristpage3066
journal lastpage3083
treeJournal of the Atmospheric Sciences:;1996:;Volume( 053 ):;issue: 021
contenttypeFulltext


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