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DOI: 10.5445/IR/1000087792
Veröffentlicht am 23.11.2018

Additional global climate cooling by clouds due to ice crystal complexity

Järvinen, Emma; Jourdan, Olivier; Neubauer, David; Yao, Bin; Liu, Chao; Andreae, Meinrat O.; Lohmann, Ulrike; Wendisch, Manfred; McFarquhar, Greg M.; Leisner, Thomas; Schnaiter, Martin

Abstract:
Ice crystal submicron structures have a large impact on the optical properties of cirrus clouds and consequently on their radiative effect. Although there is growing evidence that atmospheric ice crystals are rarely pristine, direct in situ observations of the degree of ice crystal complexity are largely missing. Here we show a comprehensive in situ data set of ice crystal complexity coupled with measurements of the cloud angular scattering functions collected during a number of observational airborne campaigns at diverse geographical locations. Our results demonstrate that an overwhelming fraction (between 61 % and 81 %) of atmospheric ice crystals sampled in the different regions contain mesoscopic deformations and, as a consequence, a similar flat and featureless angular scattering function is observed. A comparison between the measurements and a database of optical particle properties showed that severely roughened hexagonal aggregates optimally represent the measurements in the observed angular range. Based on this optical model, a new parameterization of the cloud bulk asymmetry factor was introduced and its effects were teste ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1680-7324
URN: urn:nbn:de:swb:90-877926
KITopen-ID: 1000087792
HGF-Programm 12.04.02 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 18
Heft 21
Seiten 15767–15781
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 02.11.2018
Nachgewiesen in Web of Science
Scopus
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