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Radiative Forcing by Contrails

Meerkötter, R. and Schumann, U. and Dölling, D.R. and Minnis, P. and Nakajima, T. and Tsushima, Y. (1999) Radiative Forcing by Contrails. Annales Geophysicae, 17, pp. 1080-1094.


Official URL: http://www.ann-geophys.net/17/1080/1999/


A parametric study of the instantaneous radiative impact of contrails is presented using three different radiative transfer models for a series of model atmospheres and cloud parameters. Contrails are treated as geometrically and optically thin plane parallel homogeneous cirrus layers in a static atmosphere. The ice water content is varied as a function of ambient temperature. The model atmospheres include tropical, mid-latitude, and subarctic summer and winter atmospheres. Optically thin contrails cause a positive net forcing at top of the atmosphere. At the surface the radiative forcing is negative during daytime. The forcing increases with the optical depth and the amount of contrail cover. At the top of the atmosphere, a mean contrail cover of 0.1% with average optical depth of 0.2 to 0.5 causes about 0.01 to 0.03 Wm<sup>-2</sup> daily mean instantaneous radiative forcing. Contrails cool the surface during the day and heat the surface during the night, and hence reduce the daily temperature amplitude. The net effect depends strongly on the daily variation of contrail cloud cover. The indirect radiative forcing due to particle changes in natural cirrus clouds may be of the same magnitude as the direct one due to additional cover.

Item URL in elib:https://elib.dlr.de/9071/
Document Type:Article
Title:Radiative Forcing by Contrails
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dölling, D.R.NASA Langley Research Center, Hampton, VI, USAUNSPECIFIEDUNSPECIFIED
Minnis, P.NASA Langley Research Center, Hampton, VI, USAUNSPECIFIEDUNSPECIFIED
Nakajima, T.Univ. of Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Tsushima, Y.Univ. of Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Annales Geophysicae
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1080-1094
Keywords:contrails, Atmospheric composition and structure (aerosols and particles) · Meteorology and atmospheric dynamics (climatology, radiative processes)
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 - Wake Vortices (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Löb, Ute
Deposited On:24 Jan 2008
Last Modified:31 Jul 2019 19:14

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