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Extinction and optical depth of contrails

Voigt, C. und Schumann, U. und Jessberger, P. und Jurkat, T. und Petzold, A. und Gayet, J.F. und Krämer, M. und Thornberry, T. und Fahey, D.W. (2011) Extinction and optical depth of contrails. Geophysical Research Letters, 38 (L11806), Seiten 1-5. DOI: 10.1029/2011GL046884.

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Offizielle URL: http://www.agu.org/pubs/crossref/2011/2011GL047189.shtml

Kurzfassung

One factor limiting the understanding of the climate impact from contrails and aircraft induced cloud modifications is the accurate determination of their optical depth. To this end, 14 contrails were sampled for 2756 s with instruments onboard the research aircraft Falcon during the CONCERT (CONtrail and Cirrus ExpeRimenT) campaign in November 2008. The young (<10 min old) contrails were produced by 9 commercial aircraft with weights of 47 to 508 t, among them the largest operating passenger aircraft, the Airbus A380. The contrails were observed at temperatures between 214 and 224 K and altitudes between 8.8 and 11.1 km. The measured mean in-contrail relative humidity with respect to ice was 89 ± 12%. Six contrails were observed in cloud free air, the others were embedded in thin cirrus clouds. The observed contrails exhibited a mean ice water content of 2 mg m−3 and had a mean number concentration of 117 cm−3 and effective radius of 2.9 μm assuming asphericle particles with an aspect ratio of 0.5. Probability density functions of the extinction, with a mean (median) of 1.2 (0.7) km−1, and of the optical depth τ, with a mean (median) of 0.27 (0.13), are derived from the in situ measurements and are likely representative for young contrails from the present-day commercial aircraft fleet at observation conditions. Radiative transfer estimates using the in-situ measured contrail optical depth lead to a year-2005 estimate of line-shaped contrail radiative forcing of 15.9 mWm−2 with an uncertainty range of 11.1–47.7 mWm−2.

Dokumentart:Zeitschriftenbeitrag
Titel:Extinction and optical depth of contrails
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Voigt, C.DLR
Schumann, U.DLR
Jessberger, P.DLR
Jurkat, T.DLR
Petzold, A.DLR
Gayet, J.F.Univ. Blaise Pascal, Clermont‐Ferrand, F.
Krämer, M.FZ Jülich
Thornberry, T.NOAA, Boulder, CO, USA
Fahey, D.W.NOAA, Boulder, CO, USA
Datum:2011
Erschienen in:Geophysical Research Letters
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:38
DOI :10.1029/2011GL046884
Seitenbereich:Seiten 1-5
Status:veröffentlicht
Stichwörter:contrail properties, contrail optical depth, linear contrail radiative forcing
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr, Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt, Luftfahrt
HGF - Programmthema:Erdbeobachtung, ATM und Flugbetrieb
DLR - Schwerpunkt:Raumfahrt, Luftfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung, L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung, L - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:17 Nov 2011 14:33
Letzte Änderung:26 Mär 2013 13:33

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