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Formulation and test on an ice aggregation scheme for two-moment bulk microphysics schemes

Keinast-Sjögren, E and Spichtinger, P. and Gierens, Klaus (2013) Formulation and test on an ice aggregation scheme for two-moment bulk microphysics schemes. Atmospheric Chemistry and Physics, 12, pp. 9021-9037. DOI: 10.5194/acp-13-9021-2013. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/13/9021/2013/acp-13-9021-2013.html


A simple formulation of aggregation for two-moment bulk microphysical models is derived. The solution involves the evaluation of a double integral of the collection kernel weighted with the crystal size (or mass) distribution. This quantity is to be inserted into the differential equation for the crystal number concentration which has classical Smoluchowski form. The double integrals are evaluated numerically for log-normal size distributions over a large range of geometric mean masses. A polynomial fit of the results is given that yields good accuracy. Various tests of the new parameterisation are described: aggregation as stand-alone process, in a box-model, and in 2-D simulations of a cirrostratus cloud.

Document Type:Article
Title:Formulation and test on an ice aggregation scheme for two-moment bulk microphysics schemes
AuthorsInstitution or Email of Authors
Keinast-Sjögren, EIAC, ETH Zürich, Schweiz
Spichtinger, P.IAP, Univ. Mainz
Gierens, KlausDLR, IPA
Date:September 2013
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 9021-9037
Keywords:Numerical modelling, cirrus clouds, aggregation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Projekt Verkehrsentwicklung und Umwelt (old), R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Dr.rer.nat. Klaus Martin Gierens
Deposited On:08 Oct 2012 16:22
Last Modified:28 Jul 2015 07:59

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