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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Cloud physics and chemistry
  • Atmospheric Composition and Structure: Middle atmosphere—composition and chemistry
  • Atmospheric Composition and Structure: Volcanic effects

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1551, 4 PP., 2002
doi:10.1029/2001GL013296

Cryo-chamber simulation of stratospheric H2SO4/H2O particles: Composition analysis and model comparison

Peter Zink

Max-Planck-Institut für Kernphysik, Abteilung Atmosphärenphysik, Heidelberg, Germany

Daniel A. Knopf

Max-Planck-Institut für Kernphysik, Abteilung Atmosphärenphysik, Heidelberg, Germany

Jochen Schreiner

Max-Planck-Institut für Kernphysik, Abteilung Atmosphärenphysik, Heidelberg, Germany

Konrad Mauersberger

Max-Planck-Institut für Kernphysik, Abteilung Atmosphärenphysik, Heidelberg, Germany

Ottmar Möhler

Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

Harald Saathoff

Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

Marco Seifert

Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

Ralph Tiede

Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

Ulrich Schurath

Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

The combination of a large aerosol chamber and a recently developed Aerosol Composition Mass Spectrometer (ACMS) was used to investigate sulfuric acid aerosols at low temperatures. Concentrations of condensed phase H2SO4 and H2O were determined with an accuracy of better than 4 wt.%. Simultaneous measurements of temperature, partial pressure of water, total sulfate amount and particle size distribution permit to calculate the particle equilibrium composition. The model description of Carslaw et al. [1995a] for H2SO4/H2O solutions was confirmed in the composition range from 35 to 68 wt.% H2SO4 for temperatures between 188 and 236 K, extending the experimental verification to lower temperatures. Although the sub-micron particles were up to 25 K super-cooled with respect to solid sulfuric acid hydrates such as the tetrahydrate (SAT), they remained liquid for days.

Published 15 June 2002.

Citation: Zink, P., D. A. Knopf, J. Schreiner, K. Mauersberger, O. Möhler, H. Saathoff, M. Seifert, R. Tiede, and U. Schurath (2002), Cryo-chamber simulation of stratospheric H2SO4/H2O particles: Composition analysis and model comparison, Geophys. Res. Lett., 29(11), 1551, doi:10.1029/2001GL013296.

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