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An Upgraded Estimate of the Radiative Forcing of Cryoplane Contrails

Marquart, S. und Ponater, M. und Ström, L. und Gierens, K. (2005) An Upgraded Estimate of the Radiative Forcing of Cryoplane Contrails. Meteorologische Zeitschrift, 14, Seiten 573-582. Borntraeger Science Publishers. DOI: 10.1127/0941-2948/2005/0057

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Offizielle URL: http://www.dmg-ev.de/gesellschaft/publikationen/zeitschrift.htm

Kurzfassung

The radiative forcing of contrails is quantified for a hypothetical fleet of cryoplanes in comparison with a conventional aircraft fleet. The differences in bulk optical properties between conventional and cryoplane contrails are determined by numerical simulations of the microphysical evolution of conventional and cryoplane contrails, under several ambient conditions. Both types of contrails contain about the same ice mass, but the mean effective particle radius is found to be smaller by about a factor of 0.3 in conventional contrails than in cryoplane ones. Hence, in case of cryoplanes the contrail optical depth is lower, which counteracts (with respect to radiative forcing) the effect of increased contrail cover due to the higher specific emission of water vapour. If the information gained from the microphysical simulations is translated to the framework of a global climate model, the global mean radiative forcing of cryoplane contrails is simulated to be between about 30% lower and 30% higher compared to the radiative forcing of conventional contrails, depending on the quantitative assumptions made for the mean particle properties and also depending on the time slice considered. Our results indicate that the effect of decreased optical depth is about the same magnitude as the effect of increased contrail cover. Current state of knowledge does not allow a conclusive assessment whether the net radiative impact of cryoplane contrails will be smaller or larger than that of conventional contrails. Uncertainty with respect to radiative forcing arises mainly from insufficient knowledge regarding the mean effective ice crystal radius for both conventional and, especially, cryoplane contrails.

Dokumentart:Zeitschriftenbeitrag
Titel:An Upgraded Estimate of the Radiative Forcing of Cryoplane Contrails
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Marquart, S.Univ. Heidelberg, HeidelbergNICHT SPEZIFIZIERT
Ponater, M.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ström, L.Volvo Aero Corporation, Trollhättan, SNICHT SPEZIFIZIERT
Gierens, K.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2005
Erschienen in:Meteorologische Zeitschrift
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:14
DOI :10.1127/0941-2948/2005/0057
Seitenbereich:Seiten 573-582
Verlag:Borntraeger Science Publishers
Status:veröffentlicht
Stichwörter:contrails, cryoplane, radiative forcing
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Schadstoffarmer Luftverkehr (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre
Hinterlegt von: Löb, Ute
Hinterlegt am:27 Mär 2008
Letzte Änderung:08 Mär 2018 18:46

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