Role of Feldspar and Pyroxene Minerals in the Ice Nucleating Ability of Three Volcanic Ashes
- Leif G. Jahn (6452096)
- William D. Fahy (6452099)
- Daniel B. Williams (6452102)
- Ryan C. Sullivan (2465215)
DOIAbstract
The mineralogical and immersion-mode freezing properties of volcanic ashes from three volcanoes, Volcán de Fuego and Santiaguito in Guatemala, and Soufrière Hills Volcano, in Montserrat, were examined. All ashes (sieved to <37 μm) contained effective ice nuclei, typically freezing over the temperature range of −12 to −25 °C and possessing ice active site densities (ns) spanning ∼10 1 to 10 5 cm–2 over this temperature range. The high freezing activity of the ashes was determined to likely originate from pyroxene minerals, and the ice nucleation properties of pyroxene minerals are also reported here for the first time for comparison. Ca- and Na-rich plagioclase feldspars also contributed to the observed freezing properties. Volcanic glass ...
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