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Cryo‐chamber simulation of stratospheric H 2 SO 4 /H 2 O particles: Composition analysis and model comparison
Author(s) -
Zink Peter,
Knopf Daniel A.,
Schreiner Jochen,
Mauersberger Konrad,
Möhler Ottmar,
Saathoff Harald,
Seifert Marco,
Tiede Ralph,
Schurath Ulrich
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013296
Subject(s) - aerosol , sulfuric acid , analytical chemistry (journal) , tetrahydrate , chemical composition , composition (language) , mass spectrometry , particle (ecology) , sulfate , range (aeronautics) , mineralogy , chemistry , materials science , thermodynamics , chromatography , inorganic chemistry , physics , geology , crystallography , crystal structure , linguistics , philosophy , oceanography , organic chemistry , composite material
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 H 2 SO 4 and H 2 O 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 H 2 SO 4 /H 2 O solutions was confirmed in the composition range from 35 to 68 wt.% H 2 SO 4 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.