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Optical properties of pristine ice crystals in mid-latitude cirrus clouds: a case study during CIRCLE-2 experiment

Gayet, J.-F. und Mioche, G. und Shcherbakov, V. und Gourbeyre, C. und Busen, Reinhold und Minikin, Andreas (2011) Optical properties of pristine ice crystals in mid-latitude cirrus clouds: a case study during CIRCLE-2 experiment. Atmospheric Chemistry and Physics, 11, Seiten 2537-2544. DOI: 10.5194/acp-11-2537-2011

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Offizielle URL: http://www.atmos-chem-phys.org/11/2537/2011/acp-11-2537-2011.html


In this paper, we describe in situ observations of mid-latitude cirrus cloud band carried out on 16 May 2007 during the CIRCLE-2 experiment. The Polar Nephelometer and the Cloud Particle Imager (CPI) instruments with PMS FSSP-300 and 2D-C probes were used for the description of the optical and microphysical cloud properties. Two selected cloud regions are compared and discussed in detail. Significant differences in optical properties are evidenced in terms of 22�° halo occurrences even though prevalent planar-plate ice crystals are observed in both cloud regions. Featureless scattering phase functions are measured in the first cloud region located near the trailing edge of the cirrus-band at about 11 800 m/â��57 �°C. In contrast, well pronounced 22�° halo peaks are observed with predominant similar-shaped ice crystals near the cirrus-band leading edge at 7100 m/â��27 �°C. CPI ice crystal images with Polar Nephelometer observations are carefully analysed and interpreted from a theoretical light scattering model in order to explain occurrence and non-occurrence of the 22�° halo feature. The results highlight that the halo peaks are inherent only in perfect plate ice crystals (or pristine crystals). On the basis of previous datasets in mid-latitude cirrus, it is found that simple pristine crystals are uncommon whereas particles with imperfect or complex shapes are prevalent. As a result, phase functions that are smooth and featureless best represent cirrus scattering properties.

Titel:Optical properties of pristine ice crystals in mid-latitude cirrus clouds: a case study during CIRCLE-2 experiment
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID
Gayet, J.-F.Univ. Blaise Pascal, FNICHT SPEZIFIZIERT
Mioche, G.Univ. Blaise Pascal, FNICHT SPEZIFIZIERT
Shcherbakov, V.Univ. Blaise Pascal, FNICHT SPEZIFIZIERT
Gourbeyre, C.Univ. Blaise Pascal, FNICHT SPEZIFIZIERT
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In ISI Web of Science:Ja
DOI :10.5194/acp-11-2537-2011
Seitenbereich:Seiten 2537-2544
Stichwörter:ice crystals, cirrus, CIRCLE-2, Falcon, optical properties
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Minikin, Dr.rer.nat. Andreas
Hinterlegt am:08 Dez 2010 16:04
Letzte Änderung:12 Dez 2013 21:08

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