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Modelling of cirrus clouds - Part 2: Competition of different nucleation mechanisms

Spichtinger, Peter and Gierens, Klaus (2009) Modelling of cirrus clouds - Part 2: Competition of different nucleation mechanisms. Atmospheric Chemistry and Physics, 9, pp. 2319-2334.

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Official URL: http://www.atmos-chem-phys.net/9/2319/2009/acp-9-2319-2009.pdf


We study the competition of two different freezing mechanisms (homogeneous and heterogeneous freezing) in the same environment for cold cirrus clouds. To this goal we use the recently developed and validated ice microphysics scheme (Spichtinger and Gierens, 2009a) which distinguishes between ice classes according to their formation process. We investigate cases with purely homogeneous ice formation and compare them with cases where background ice nuclei in varying concentration heterogeneously form ice prior to homogeneous nucleation. We perform additionally a couple of sensitivity studies regarding threshold humidity for heterogeneous freezing, uplift speed, and ambient temperature, and we study the influence of random motions induced by temperature fluctuations in the clouds. We find three types of cloud evolution, homogeneously dominated, heterogeneously dominated, and a mixed type where neither nucleation process dominates. The latter case is prone to long�lasting in�cloud ice supersaturation of the order 30% and more.

Document Type:Article
Title:Modelling of cirrus clouds - Part 2: Competition of different nucleation mechanisms
AuthorsInstitution or Email of Authors
Spichtinger, PeterETHZ
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 2319-2334
Keywords:Cirrus clouds, nucleation, in-cloud supersaturation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr.rer.nat. Klaus Martin Gierens
Deposited On:09 Nov 2009 12:44
Last Modified:12 Dec 2013 20:44

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