Title Gas phase acetic acid and its qualitative effects on snow crystal morphology and the quasi-liquid layer
Author Knepp, T.N.; Renkens, T.L.; Shepson, P.B.
Author Affil Knepp, T.N., Purdue University, Department of Chemistry, West Lafayette, IN
Source Atmospheric Chemistry and Physics, 9(20), p.7679-7690, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2009
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 9 January 2009, http://www.atmos-chem-phys- discuss.net/9/735/2009/acpd-9-735-2009.html; accessed in May, 2011. 83 refs. GeoRef Acc. No: 310497
Index Terms albedo; avalanches; boundary layer; crystal growth; crystals; experimentation; geochemistry; humidity; ice; ice crystals; liquid phases; mass movements (geology); ozone; permeability; snow; supersaturation; temperature; water; water temperature; acetic acid; acids; carboxylic acids; crystal chemistry; crystallization; dendritic crystals; effects; experimental studies; gaseous phase; laboratory studies; liquid phase; mass movements; molecular dynamics; organic acids; organic compounds; shape analysis; snowpack
Abstract A chamber was constructed within which snow crystals were grown on a string at various temperatures, relative humidities, and acetic acid gas phase mole fractions. The temperature, relative humidity, and acid mole fraction were measured for the first time at the point of crystal growth. Snow crystal morphological transition temperature shifts were recorded as a function of acid mole fraction, and interpreted according to the calculated acid concentration in the crystal's quasi-liquid layer, which is believed to have increased in thickness as a function of acid mole fraction, thereby affecting the crystal's morphology consistent with the hypothesis of Kuroda and Lacmann. Deficiencies in the understanding of the quasi-liquid layer and its role in determining snow crystal morphology are briefly discussed.
URL http://www.atmos-chem-phys.net/9/7679/2009/acp-9-7679-2009.pdf
Publication Type journal article
Record ID 65007104