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The evolution of microphysical and optical properties of an A380 contrail in the vortex phase

Gayet, J.-F. und Shcherbakov, V. und Voigt, C. und Schumann, Ulrich und Schäuble, Dominik und Jeßberger, Philipp und Petzold, Andreas und Minikin, Andreas und Schlager, Hans und Dubovik, O. und Lapyonok, T. (2012) The evolution of microphysical and optical properties of an A380 contrail in the vortex phase. Atmospheric Chemistry and Physics, 12, Seiten 6629-6643. DOI: 10.5194/acp-12-6629-2012.

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Offizielle URL: http://www.atmos-chem-phys.net/12/6629/2012/acp-12-6629-2012.html

Kurzfassung

A contrail from a large-body A380 aircraft at cruise in the humid upper troposphere has been probed with in-situ instruments onboard the DLR research aircraft Falcon. The contrail was sampled during 700 s measurement time at contrail ages of about 1â��4 min. The contrail was in the vortex regime during which the primary wake vortices were sinking 270 m below the A380 flight level while the secondary wake remained above. Contrail properties were sampled separately in the primary wake at 90 and 115 s contrail age and nearly continously in the secondary wake at contrail ages from 70 s to 220 s. The scattering phase functions of the contrail particles were measured with a polar nephelometer. The asymmetry parameter derived from these data is used to distinguish between quasi-spherical and aspherical ice particles. In the primary wake, quasi-spherical ice particles were found with concentrations up to 160 cmâ��3, mean effective diameter Deff of 3.7 �¼m, maximum extinction of 7.0 kmâ��1, and ice water content (IWC) of 3 mg mâ��3 at slightly ice-subsaturated conditions. The secondary and primary wakes were separated by an almost particle-free wake vortex gap. The secondary wake contained clearly aspherical contrail ice particles with mean Deff of 4.8 �¼m, mean (maximum) concentration, extinction, and IWC of 80 (350) cmâ��3, 1.6 (5.0) kmâ��1, and 2.5 (10) mg mâ��3, respectively, at conditions apparently above ice-saturation. The asymmetry parameter in the secondary wake decreased with contrail age from 0.87 to 0.80 on average indicating a preferential aspherical ice crystal growth. A retrieval of ice particle habit and size with an inversion code shows that the number fraction of aspherical ice crystals increased from 2% initially to 56% at 4 min contrail age. The observed crystal size and habit differences in the primary and secondary wakes of an up to 4 min old contrail are of interest for understanding ice crystal growth in contrails and their climate impact. Aspherical contrail ice particles cause less radiative forcing than spherical ones.

Dokumentart:Zeitschriftenbeitrag
Titel:The evolution of microphysical and optical properties of an A380 contrail in the vortex phase
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Gayet, J.-F.Univ. Blaise Pascal, Clermont-Ferrand, F
Shcherbakov, V.Univ. Blaise Pascal, Clermont-Ferrand, F
Voigt, C.NICHT SPEZIFIZIERT
Schumann, UlrichNICHT SPEZIFIZIERT
Schäuble, DominikNICHT SPEZIFIZIERT
Jeßberger, PhilippNICHT SPEZIFIZIERT
Petzold, AndreasNICHT SPEZIFIZIERT
Minikin, AndreasNICHT SPEZIFIZIERT
Schlager, HansNICHT SPEZIFIZIERT
Dubovik, O.Univ. des Sciences et Technologies de Lille, Villeneuve d'Ascq, F
Lapyonok, T.Univ. des Sciences et Technologies de Lille, Villeneuve d'Ascq, F
Datum:2012
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:12
DOI :10.5194/acp-12-6629-2012
Seitenbereich:Seiten 6629-6643
Status:veröffentlicht
Stichwörter:climate impact, Falcon
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 - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre
Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:01 Aug 2012 11:06
Letzte Änderung:12 Dez 2013 21:44

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