ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-7679-2009 Gas phase acetic acid and its qualitative effects on snow crystal morphology and the quasi-liquid layer Knepp T. N. 1 Renkens T. L. 1 Shepson P. B. 1 2 3 Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, IN 47907, USA Department of Earth and Atmospheric Science, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907, USA Purdue Climate Change Research Center, Purdue University, 503 Northwestern Ave., West Lafayette, IN 47907, USA 16 10 2009 9 20 7679 7690 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/7679/2009/acp-9-7679-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/7679/2009/acp-9-7679-2009.pdf

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.

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