The uptake of HNO3 onto ice, NAT, and frozen sulfuric acid

Details The uptake of HNO3 onto ice, NAT, and frozen sulfuric acid The uptake of HNO3 onto ice, NAT, and frozen sulfuric acid

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2063h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2063-2066.

Physics

28

Cloud Physics, Nitric Acid, Ozone Depletion, Stratosphere, Sulfuric Acid, Ice Clouds, Supersaturation

Scientific paper

HNO3 vapor was taken up onto the surfaces of pure ice, frozen sulfuric acid, and NAT under stratospheric conditions. The NAT-type solids formed on these surfaces were grown in a state that was not in complete vapor-solid equilibrium. They exhibited a steady-state pHNO3 that was greater than PT(NAT) by a factor that ranged between 3 and 10. It is suggested that the measured HNO3 uptake coefficients and the equilibrium PT(NAT) are not adequate parameters on which to prescribe Type I PSC growth, and an additional hindrance to the growth of NAT exists. The observation of a hindrance to NATO growth accounts for the stratospheric HNO3 measurements where large supersaturations in HNO3 were observed. The pHNO3 over HNO3/H2O deposits were observed to be close to those expected for NAT after the deposit was allowed to 'condition' for time periods up to an hour. Time periods up to hours may be required for HNO3-H2O particles in the stratosphere to come into complete vapor-solid equilibrium as NAT.

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