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Dual-polarization airborne lidar observations of polar stratospheric cloud evolutionDual-polarization 0.532 micron lidar data show systematic polar stratospheric cloud (PSC) evolution along a portion of the Airborne Arctic Stratospheric Expedition DC-8 flight of January 31, 1989. This flight leg was roughly aligned with air parcel motion on isentropic surfaces from 400-500 K, where the local adiabatic cooling rate was about 20 K/day. Type 1 PSCs show low depolarization ratios and scattering ratios which approach intermediate limiting values as ambient temperature decreases. These data suggest that Type 1 particles formed by rapid cooling may be nearly spherical and are restricted in size by partitioning of a limited HNO3 vapor supply among many competing growth sites. Type 2 PSCs appear at temperatures below estimated local frost points with increases in depolarization and scattering typical of larger ice crystals.
Document ID
19900041428
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Poole, L. R.
(NASA Langley Research Center Hampton, VA, United States)
Mccormick, M. P.
(NASA Langley Research Center Hampton, VA, United States)
Kent, G. S.
(Science and Technology Corp. Hampton, VA, United States)
Hunt, W. H.
(Wyle Laboratories, Inc. Hampton, VA, United States)
Osborn, M. T.
(ST Systems Corp. Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Geophysical Research Letters, Supplement
Volume: 17
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
90A28483
Distribution Limits
Public
Copyright
Other

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