FOG MODIFICATION STUDIES ON THE GREENLAND ICE CAP.

During the summer of 1965, the CRREL cloud physics group carried out a study of fog modification by propane and dry ice seeding on the Greenland Ice Cap, an area with one of the lowest concentrations of atmospheric pollution on earth. The nuclei of supercooled fog droplets before seeding were observ...

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Bibliographic Details
Main Author: Kumai,Motoi
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1969
Subjects:
Meteorology
(*GREENLAND
FOG)
(*FOG
REDUCTION)
SUPERCOOLING
EVAPORATION
DROPS
WATER VAPOR
ICE
PROPANE
NUCLEATION
LANDING FIELDS
ELECTRON MICROSCOPY
AIR POLLUTION
VAPORIZATION
CARBON DIOXIDE
VISIBILITY
FOG DISPERSAL
Greenland
Ice cap
Online Access:http://www.dtic.mil/docs/citations/AD0689448
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0689448
Description
Summary:During the summer of 1965, the CRREL cloud physics group carried out a study of fog modification by propane and dry ice seeding on the Greenland Ice Cap, an area with one of the lowest concentrations of atmospheric pollution on earth. The nuclei of supercooled fog droplets before seeding were observed using electron microscopy and electron diffraction methods. The nuclei of ice crystals formed by dry ice and propane seeding were also observed using the same technique. The nuclei of the supercooled fog droplets and the ice crystals formed by seeding were found to be hygroscopic sea salt particles that were easily distinguished from the clay mineral nuclei of natural snow crystals. The sublimation temperature of carbon dioxide is -78.5C. The boiling point of liquid propane is -44.5C at 1 atm pressure. It is concluded that the ice nucleation of supercooled fog by dry ice and liquid propane seeding is due to thermal effects. (Author)

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