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  Experimental investigation of homogeneous freezing of sulphuric acid particles in the aerosol chamber AIDA

Möhler, O., Stetzer, O., Schaefers, S., Linke, C., Schnaiter, M., Tiede, R., et al. (2003). Experimental investigation of homogeneous freezing of sulphuric acid particles in the aerosol chamber AIDA. Atmospheric Chemistry and Physics, 3, 211-223.

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 Creators:
Möhler, O.1, Author
Stetzer, O.1, Author
Schaefers, S.1, Author
Linke, C.1, Author
Schnaiter, M.1, Author
Tiede, R.1, Author
Saathoff, H.2, Author           
Kramer, M.1, Author
Mangold, A.1, Author
Budz, P.2, Author           
Zink, P.2, Author           
Schreiner, J.3, Author           
Mauersberger, K.2, Author           
Haag, W.1, Author
Karcher, B.1, Author
Schurath, U.1, Author
Affiliations:
1Forschungszentrum Karlsruhe, Inst Meteorol & Climate Res IMK; AAF, D-76021 Karlsruhe, Germany; Forschungszentrum Karlsruhe, Inst Meteorol & Climate Res IMK AAF, D-76021 Karlsruhe, Germany; KFA Julich GmbH, Forschungszentrum, Inst Chem & Dynam Geosphare ICG1, Julich, Germany; DLR, IPA, Oberpfaffenhofen, Germany, ou_persistent22              
2Prof. Konrad Mauersberger, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907550              
3Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society, ou_904549              

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 Abstract: The homogeneous freezing of supercooled H2SO4/H2O solution droplets was investigated in the aerosol chamber AIDA (Aerosol Interactions and Dynamics in the Atmosphere) of Forschungszentrum Karlsruhe. 24 freezing experiments were performed at temperatures between 189 and 235 K with aerosol particles in the diameter range 0.05 to 1 mum. Individual experiments started at homogeneous temperatures and ice saturation ratios between 0.9 and 0.95. Cloud cooling rates up to -2.8 K min(-1) were simulated dynamically in the chamber by expansion cooling using a mechanical pump. Depending on the cooling rate and starting temperature, freezing threshold relative humidities were exceeded after expansion time periods between about 1 and 10 min. The onset of ice formation was measured with three independent methods showing good agreement among each other. Ice saturation ratios measured at the onset of ice formation increased from about 1.4 at 231 K to about 1.75 at 189 K. The experimental data set including thermodynamic parameters as well as physical and chemical aerosol analysis provides a good basis for microphysical model applications.

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Language(s): eng - English
 Dates: 2003-02-20
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 29213
ISI: 000181074900002
 Degree: -

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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 3 Sequence Number: - Start / End Page: 211 - 223 Identifier: ISSN: 1680-7324