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Microphysical and radiative characterization of a subvisible midlevel Arctic ice cluod by airborne observations - a case study

Lampert, A. und Ehrlich, A. und Dörnbrack, A. und Jourdan, O. und Gayet, J.-F. und Mioche, G. und Shcherbakov, V. und Ritter, C. und Wendisch, M. (2009) Microphysical and radiative characterization of a subvisible midlevel Arctic ice cluod by airborne observations - a case study. Atmospheric Chemistry and Physics, 9, Seiten 2647-2661. DOI: 10.5194/acp-9-2647-2009.

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Offizielle URL: http://www.atmos-chem-phys.net/9/2647/2009/acp-9-2647-2009.pdf

Kurzfassung

During the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign, which was conducted in March and April 2007, an optically thin ice cloud was observed south of Svalbard at around 3 km altitude. The microphysical and radiative properties of this particular subvisible midlevel cloud were investigated with complementary remote sensing and in situ instruments. Collocated airborne lidar remote sensing and spectral solar radiation measurements were performed at a flight altitude of 2300 m below the cloud base. Under almost stationary atmospheric conditions, the same subvisible midlevel cloud was probed with various in situ sensors roughly 30 min later. From individual ice crystal samples detected with the Cloud Particle Imager and the ensemble of particles measured with the Polar Nephelometer, microphysical properties were retrieved with a bi-modal inversion algorithm. The best agreement with the measurements was obtained for small ice spheres and deeply rough hexagonal ice crystals. Furthermore, the single-scattering albedo, the scattering phase function as well as the volume extinction coefficient and the effective diameter of the crystal population were determined. A lidar ratio of 21(�±6) sr was deduced by three independent methods. These parameters in conjunction with the cloud optical thickness obtained from the lidar measurements were used to compute spectral and broadband radiances and irradiances with a radiative transfer code. The simulated results agreed with the observed spectral downwelling radiance within the range given by the measurement uncertainty. Furthermore, the broadband radiative simulations estimated a net (solar plus thermal infrared) radiative forcing of the subvisible midlevel ice cloud of â��0.4 W mâ��2 (â��3.2 W mâ��2 in the solar and +2.8 W mâ��2 in the thermal infrared wavelength range).

Dokumentart:Zeitschriftenbeitrag
Titel:Microphysical and radiative characterization of a subvisible midlevel Arctic ice cluod by airborne observations - a case study
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Lampert, A.AWI, Potsdam
Ehrlich, A.LIM, Leipzig
Dörnbrack, A.DLR
Jourdan, O.Univ. Blaise Pascal, Clermont-Ferrand, F
Gayet, J.-F.Univ. Blaise Pascal, Clermont-Ferrand, F
Mioche, G.Univ. Blaise Pascal, Clermont-Ferrand, F
Shcherbakov, V.Univ. Blaise Pascal, Clermont-Ferrand, F
Ritter, C.AWI, Potsdam
Wendisch, M.LIM, Leipzig
Datum:2009
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:9
DOI :10.5194/acp-9-2647-2009
Seitenbereich:Seiten 2647-2661
Status:veröffentlicht
Stichwörter:ASTAR, Arktische Grenzschicht, Mischphasenwolken, Lidar
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben LIDAR-Forschung und -Entwicklung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Jana Freund
Hinterlegt am:12 Mai 2010 13:00
Letzte Änderung:12 Dez 2013 20:57

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