Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1429h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1429-1432. Research supported by NSF.
Physics
14
Antarctic Regions, Arctic Regions, Condensation Nuclei, Ice Clouds, Particle Size Distribution, Stratosphere, Ambient Temperature, Balloon-Borne Instruments, Cloud Glaciation, Nitric Acid
Scientific paper
Balloon-borne measurements of stratospheric clouds using optical particle counters in the Arctic and the Antarctic are conmpared in terms of particle size distribution. There appear to be two distinct classes of particles, a small mode in which at least half of the available condensation nuclei have grown, and a large mode in which fewer than 1 percent of the available condensation nuclei have grown. The latter particles appear in thin layers while the former appear in relatively thicker layer. Temperature dictate a nitric acid trihydrate composition for most of the layers and the inferred HNO3 vapor in the large particles is comparable to that available. While the small particle mode is probably related to fast cooling event such as those associated with mountain lee waves, the origin of the thin layers of large particles is not apparent.
Deshler Terry
Hofmann David J.
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