NDLI: A laboratory study on the phase transition for polar stratospheric cloud particles

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A laboratory study on the phase transition for polar stratospheric cloud particles

Content Provider	NASA Technical Reports Server (NTRS)
Author	Teets Jr., Edward H.
Copyright Year	1997
Description	The nucleation and growth of different phases of simulated polar stratospheric cloud (PSC) particles were investigated in the laboratory. Solutions and mixtures of solutions at concentrations 1 to 5 m (molality) of ammonium sulfate, ammonium bisulfate, sodium chloride, sulfuric acid, and nitric acid were supercooled to prescribed temperatures below their equilibrium melting point. These solutions were contained in small diameter glass tubing of volumes ranging from 2.6 to 0.04 ml. Samples were nucleated by insertion of an ice crystal, or in some cases by a liquid nitrogen cooled wire. Crystallization velocities were determined by timing the crystal growth front passages along the glass tubing. Solution mixtures containing aircraft exhaust (soot) were also examined. Crystallization rates increased as deltaT2, where deltaT is the supercooling for weak solutions (2 m or less). The higher concentrated solutions (greater than 3 m) showed rates significantly less than deltaT2. This reduced rate suggested an onset of a glass phase. Results were applied to the nucleation of highly concentrated solutions at various stages of polar stratospheric cloud development within the polar stratosphere.
File Size	3663017
Page Count	60
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970014216
Archival Resource Key	ark:/13960/t9479b41r
Language	English
Publisher Date	1997-03-01
Access Restriction	Open
Subject Keyword	Geophysics Crystal Growth Ammonium Sulfates Nucleation Cloud Physics Crystallization Stratosphere Clouds Meteorology Supercooling Ammonium Chlorides Ice Clouds Sulfuric Acid Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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