Formation of model polar stratospheric cloud films

Details Formation of model polar stratospheric cloud films Formation of model polar stratospheric cloud films

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2417m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 24, p. 2417-2420.

Physics

16

Chemical Reactions, Cloud Physics, Infrared Spectroscopy, Nitric Acid, Polar Regions, Stratosphere, Absorption Spectra, Amorphous Materials, Crystallinity, Fourier Transformation, Infrared Spectra

Scientific paper

Fourier transform infrared spectroscopy was used to examine the competitive growth of films representative of polar stratospheric clouds. These experiments show that either crystalline nitric acid trihydrate (beta-NAT) or amorphous films with H2O:HNO3 ratios close to 3:1 formed at temperatures 3-7 K warmer than the ice frost point under stratospheric pressure conditions. In addition, with higher HNO3 pressure, we observed nitric acid dihydrate (NAD) formation at temperatures warmer than ice formation. However, our experiments also show that NAD surfaces converted to beta-NAT upon exposure to stratospheric water pressures. Finally, we determined that the net uptake coefficient for HNO3 on beta-NAT is close to unity, whereas the net uptake coefficient for H2O is much less.

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