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Process-based simulation of contrail cirrus in a global climate model

Burkhardt, Ulrike und Kärcher, Bernd (2009) Process-based simulation of contrail cirrus in a global climate model. Journal of Geophysical Research, 114 (D16201), Seiten 1-13. DOI: 10.1029/2008JD011491.

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Kurzfassung

Aviation induces changes in global cirrus cloudiness by producing contrails. In the past, line shaped contrail coverage has been parameterized relying on the scaling of contrail formation frequency to observed values. Coverage due to irregularly shaped contrail cirrus, that develop from line shaped contrails, could not be estimated with this method. We introduce a process-based parameterization of contrail cirrus in a global climate model that does not rely on scaling and that is not restricted to line shaped contrails. A new prognostic cloud class, contrail cirrus, is introduced that is allowed to develop in the parameterized, fractional ice supersaturated area. Initial dimensions of the contrails and a parameter controlling their spreading in a sheared flow are constrained by observational data. In an idealized experiment contrail cirrus coverage is found to be dominated by a major contrail outbreak and scales with supersaturation rather than contrail formation frequency. The global distribution of young contrail coverage is smoothed out due to transport but overall values are similar compared to older estimates. Interannual variability of young contrail coverage can be as large as the mean coverage. The sensitivity of the model simulations to physical model parameters and to parameters concerning the comparison with observational data is studied. The associated uncertainty of global line shaped contrail coverage can be as high as 60% of the reference estimate (0.05%). The simulated coverage due to young contrails agrees reasonably well with most satellite observations of regional line shaped contrail coverage considering the sensitivity to the above parameters and the interannual variability.

Dokumentart:Zeitschriftenbeitrag
Titel:Process-based simulation of contrail cirrus in a global climate model
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Burkhardt, UlrikeNICHT SPEZIFIZIERT
Kärcher, BerndNICHT SPEZIFIZIERT
Datum:20 August 2009
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:114
DOI :10.1029/2008JD011491
Seitenbereich:Seiten 1-13
Status:veröffentlicht
Stichwörter:contrails contrail cirrus climate climate model
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Faktor Mensch und Sicherheit in der Luftfahrt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Dr.rer.nat. Ulrike Burkhardt
Hinterlegt am:09 Nov 2009 11:37
Letzte Änderung:23 Jan 2014 11:36

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