Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..413d&link_type=abstract
Geophysical Research Letters, Supplement (ISSN 0094-8276), vol. 17, March 1990, p. 413-416.
Physics
28
Cloud Cover, Ozone Depletion, Particle Size Distribution, Spectral Methods, Stratosphere, Condensation Nuclei, Forward Scattering, Nitric Acid, Polar Regions
Scientific paper
Particle-size distributions measured from the NASA ER-2 with the new Forward Scattering Spectrometer Probe 300 in a type I polar stratospheric cloud (PSC) on January 24, 1989 show a volume mode near 0.8 micron in diameter. The large increase in particle concentration and volume after cloud entry did not occur until the apparent saturation ratio of nitric acid with respect to nitric acid trihydrate reached 10, but at ratios near 1 subtle changes in the size distribution suggest some type I particles were present. Particle concentrations in cloud of 15-17/cu cm were greater than the CN concentrations of 5-7/cu cm just outside of cloud, suggesting nucleation on more than just sulfate particles. Some particles greater than 4 microns in diameter were observed in a region which was saturated with respect to ice.
Baumgardner Darrel
Chan Roland K.
Dye James E.
Ferry G. V.
Gandrud B. W.
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