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Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing

Ehrlich, A. und Wendisch, M. und Bierwirth, E. und Gayet, J.-F. und Mioche, G. und Lampert, A. und Mayer, B. (2009) Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing. Atmospheric Chemistry and Physics (9), Seiten 9401-9416.

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Offizielle URL: http://www.atmos-chem-phys.net/9/9401/2009/acp-9-9401-2009.html

Kurzfassung

The vertical distribution of ice crystals in Arctic boundary-layer mixed-phase (ABM) clouds was investigated by airborne remote-sensing and in situ measurements during the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign in March and April 2007. Information on the spectral absorption of solar radiation by ice and liquid water cloud particles is derived from airborne measurements of solar spectral radiation reflected by these clouds. It is shown by calculation of the vertical weighting function of the measurements that the observed absorption of solar radiation is dominated by the upper cloud layers (50% within 200 m from cloud top). This vertical weighting function is shifted even closer to cloud top for wavelengths where absorption by ice dominates. On this basis an indicator of the vertical distribution of ice crystals in ABM clouds is designed. Applying in situ measured microphysical properties, the cloud-top reflectivity was calculated by radiative transfer simulations and compared to the measurements. It is found that ice crystals near cloud top (mixed-phase cloud top layer) are necessary to reproduce the measurements at wavelengths where absorption by ice dominates. The observation of backscatter glories on the cloud top generally indicating liquid water droplets does not contradict the postulated presence of ice crystals. Radiative transfer simulations reproduce the observed glories even if the cloud top layer is of mixed-phase character.

Dokumentart:Zeitschriftenbeitrag
Titel:Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ehrlich, A.Johannes Gutenberg-Univ. Mainz, Mainz
Wendisch, M.Johannes Gutenberg-Univ. Mainz, Mainz
Bierwirth, E.Univ. of Colorado, Boulder, USA
Gayet, J.-F.Univ. Blaise Pascal, Aubière Cedex, F
Mioche, G.Univ. Blaise Pascal, Aubière Cedex, F
Lampert, A.AWI, Potsdam
Mayer, B.DLR
Datum:2009
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Seitenbereich:Seiten 9401-9416
Status:veröffentlicht
Stichwörter:Mixed phase clouds, ice phase, radiative transfer, backscatter glory
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 Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Fernerkundung der Atmosphäre
Hinterlegt von: Dr.rer.nat. Bernhard Mayer
Hinterlegt am:16 Dez 2009 12:14
Letzte Änderung:12 Dez 2013 20:49

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