Water activity and equilibrium freezing temperatures of aqueous NH4HSO4 solutions from -30 to 25°C

Details Water activity and equilibrium freezing temperatures of aqueous NH4HSO4 solutions from -30 to 25°C Water activity and equilibrium freezing temperatures of aqueous NH4HSO4 solutions from -30 to 25°C

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2391c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 15, p. 2391-2394

Physics

6

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Electromagnetics: Scattering And Diffraction

Scientific paper

One mechanism of cirrus cloud formation is homogeneous ice nucleation within ammoniated sulfuric acid particles. An important constraint on ice formation is the (NH4)2SO4-H2SO4-H2O phase diagram. In the completed laboratory work, the NH4HSO4-H2O phase diagram is determined over the domain relevant to the troposphere. The H2O vapor pressures of aqueous NH4HSO4 solutions are measured from -30 to 25°C, and the compositions of the aqueous phase in equilibrium with a solid phase (i.e., ice or letovicite) are determined at several temperatures. Below 25°C and above 42 wt% NH4HSO4(aq), the first solid to form from supersaturated NH4HSO4(aq) is (NH4)3H(SO4)2(s), not NH4HSO4(s). Supercooling of nearly 20 K is required to initiate letovicite formation for 100 mL samples. The results of this study are in good agreement with the calculations of Clegg et al. [1998].

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