elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

The Role of Organic Aerosols in Homogeneous Ice Formation

Kärcher, B. and Koop, T. (2005) The Role of Organic Aerosols in Homogeneous Ice Formation. Atmospheric Chemistry and Physics, 5, pp. 703-714.

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
309kB

Official URL: http://www.atmos-chem-phys.org/acp/5/703/

Abstract

Recent field observations suggest that the fraction of organic-containing aerosol particles in ice cloud particles is diminished when compared to the background aerosol prior to freezing. In this work, we use model calculations to investigate possible causes for the observed behavior. In particular, homogeneous freezing processes in cooling air parcels containing aqueous inorganic particles and organic particles are studied with a detailed microphysical model. A disparate water uptake and resulting size differences that occur between organic and inorganic particles prior to freezing are identified as the most likely reason for the poor partitioning of organic aerosols into the ice phase. The differences in water uptake can be caused by changes in the relationship between solute mass fraction and water activity of the supercooled liquid phase, by modifications of the accommodation coefficient for water molecules, or by a combination thereof. The behavior of peak ice saturation ratios and total ice crystal number concentrations is examined, and the dependence of the results on cooling rate is investigated. Finally, processes are discussed that could possibly modify the homogeneous freezing behavior of organic particles.

Document Type:Article
Additional Information:LIDO-Berichtsjahr=2005,
Title:The Role of Organic Aerosols in Homogeneous Ice Formation
Authors:
AuthorsInstitution or Email of Authors
Kärcher, B.UNSPECIFIED
Koop, T.Inst. f. Physik, Univ. Bielefeld
Date:2005
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:5
Page Range:pp. 703-714
Status:Published
Keywords:Homogenes Gefrieren, organisches Aerosol, Zirrusbildung
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 Trace Species
Deposited By: Ute Löb
Deposited On:19 Mar 2007
Last Modified:12 Dec 2013 20:00

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.