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Physicochemistry of Aircraft-Generated Liquid Aerosols, Soot, and Ice Particles. 2. Comparison with Observations and Sensitivity Studies

Kärcher, B. and Busen, R. and Petzold, A. and Schröder, F.P. and Schumann, U. and Jensen, E.J. (1998) Physicochemistry of Aircraft-Generated Liquid Aerosols, Soot, and Ice Particles. 2. Comparison with Observations and Sensitivity Studies. Journal of Geophysical Research, 103, pp. 17129-17147.

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Official URL: http://www.agu.org/journals/gl/

Abstract

Results from a coupled microphysical-chemical-dynamical trajectory box model have been compared to recent in situ observations of particles generated in the wake of aircraft. Sulfur emissions mainly cause the formation of ultrafine volatile particles in young aircraft plumes (mean number radius ∼ 5 nm). Volatile particle numbers range between 10<sup>16</sup> and 10<sup>17</sup> per kg fuel burnt for average to high fuel sulfur levels, exceeding typical soot emission indices by a factor of 10–100. Model results come into closer agreement with observations when chemi-ions from fuel combustion are included in the aerosol dynamics. Ice particles (mean number radius ‹ 1 μm) in young contrails mainly nucleate on water-activated exhaust aerosols. Homogeneous freezing and soot-induced heterogeneous freezing are competitive processes leading to ice formation, depending on the temperature and level of oxidized sulfur species. There is evidence that soot triggers freezing even for low fuel sulfur contents, suggesting a sulfur-independent water activation pathway. Metal particles emitted by jet engines and entrained ambient aerosols may contribute to the formation of larger (› 1 μm.) crystals. Contrails with larger crystals would also form without soot and sulfur emissions. The lifecycle of cirrus clouds can be modified by exhaust aerosols.

Item URL in elib:https://elib.dlr.de/8939/
Document Type:Article
Title:Physicochemistry of Aircraft-Generated Liquid Aerosols, Soot, and Ice Particles. 2. Comparison with Observations and Sensitivity Studies
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kärcher, B.UNSPECIFIEDUNSPECIFIED
Busen, R.UNSPECIFIEDUNSPECIFIED
Petzold, A.UNSPECIFIEDUNSPECIFIED
Schröder, F.P.UNSPECIFIEDUNSPECIFIED
Schumann, U.UNSPECIFIEDUNSPECIFIED
Jensen, E.J.NASA Ames, USAUNSPECIFIED
Date:1998
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:103
Page Range:pp. 17129-17147
Status:Published
Keywords:aerosols, soot, contrails, aircraft
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: DLR-Beauftragter, elib
Deposited On:16 Sep 2005
Last Modified:31 Jul 2019 19:14

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