elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Colors of Contrails from Fuels with Different Sulfur Contents

Gierens, K. and Schumann, U. (1996) Colors of Contrails from Fuels with Different Sulfur Contents. Journal of Geophysical Research, 101, pp. 16731-16736.

[img]
Preview
PDF
768kB

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

Abstract

During a recent flight experiment, contrails were produced from fuels with normal and very high sulfur content. A color effect was observed [Schumann et al, 1996]. When observed with the Sun in the back, the low-sulfur contrail appeared grey with weak contrast against the cloud deck underneath, whereas the high-sulfur contrail appeared slightly brown with higher contrast. In order to give an explanation, we compute the optical properties of the soot-containing droplets in the contrails and perform a simple radiative transfer computation. We find that the degree of activation of the soot particles is the basic parameter for the explanation of color and contrast of the contrails. It determines the size and number concentration of the droplets, which both in turn determine the optical properties of the contrail as a whole. For the visual appearance of the relatively optically thin contrails (τ ≲ 1.2) the soot volume fraction in the droplets plays only a minor role.

Item URL in elib:https://elib.dlr.de/32169/
Document Type:Article
Title:Colors of Contrails from Fuels with Different Sulfur Contents
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gierens, K.UNSPECIFIEDUNSPECIFIED
Schumann, U.UNSPECIFIEDUNSPECIFIED
Date:1996
Journal or Publication Title:Journal of Geophysical Research
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:101
Page Range:pp. 16731-16736
Status:Published
Keywords:contrails, nucleation, radiative properties
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.