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The January 30, 1989 Arctic polar stratospheric clouds (PSC) event - Evidence for a mechanism of dehydrationIn-situ particle measurements made aboard the NASA ER-2 in the Arctic on 890130 (YYMMDD) show Type 1 PSC particles over much of the flight, with instances of embedded Type 2 PSCs. The Type 2 particles were observed at temperatures warmer than the local frost-point temperature of water; extended up to the upper size cutoff of the instrument (about 24-micron diameter); and are shown to contain too large a volume to be primarily NAT. Based on measured vertical temperature profiles, it is concluded that the Type 2 particles observed on this day were formed above the aircraft in a region where saturation with respect to ice was achieved and were sufficiently large to have fallen into the path of the ER-2. Although the amount of material in the particles, expressed as water, is small by comparison to the total (vapor + aerosol) water concentration, the flux of water from the falling particles is of sufficient magnitude, if sustained, to lead to dehydration of the source region. These observations verify the mechanism for dehydration of polar vortex air masses by precipitation of ice particles.
Document ID
19900041445
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gandrud, B. W.
(National Center for Atmospheric Research Boulder, CO, United States)
Dye, J. E.
(National Center for Atmospheric Research Boulder, CO, United States)
Baumgardner, D.
(NCAR Boulder, CO, United States)
Ferry, G. V.
(National Center for Atmospheric Research Boulder, CO, United States)
Loewenstein, M.
(National Center for Atmospheric Research Boulder, CO, United States)
Chan, K. R.
(NASA Ames Research Center Moffett Field, CA, United States)
Sanford, L.
(Washington, University Seattle, United States)
Gary, B.
(JPL Pasadena, CA, 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
90A28500
Distribution Limits
Public
Copyright
Other

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