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Not all feldspars are equal : a survey of ice nucleating properties across the feldspar group of minerals
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Harrison, Alexander D., Whale, Tom, Carpenter, Michael A., Holden, Mark A., Neve, Lesley, O'Sullivan, Daniel, Vergara Temprado, Jesus and Murray, Benjamin J. (2016) Not all feldspars are equal : a survey of ice nucleating properties across the feldspar group of minerals. Atmospheric Chemistry and Physics, 16 (17). pp. 10927-10940. doi:10.5194/acp-16-10927-2016 ISSN 1680-7324.
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Official URL: http://dx.doi.org/10.5194/acp-16-10927-2016
Abstract
Mineral dust particles from wind-blown soils are known to act as effective ice nucleating particles in the atmosphere and are thought to play an important role in the glaciation of mixed phase clouds. Recent work suggests that feldspars are the most efficient nucleators of the minerals commonly present in atmospheric mineral dust. However, the feldspar group of minerals is complex, encompassing a range of chemical compositions and crystal structures. To further investigate the ice-nucleating properties of the feldspar group we measured the ice nucleation activities of 15 characterized feldspar samples. We show that alkali feldspars, in particular the potassium feldspars, generally nucleate ice more efficiently than feldspars in the plagioclase series which contain significant amounts of calcium. We also find that there is variability in ice nucleating ability within these groups. While five out of six potassium-rich feldspars have a similar ice nucleating ability, one potassium rich feldspar sample and one sodium-rich feldspar sample were significantly more active. The hyper-active Na-feldspar was found to lose activity with time suspended in water with a decrease in mean freezing temperature of about 16 °C over 16 months; the mean freezing temperature of the hyper-active K-feldspar decreased by 2 °C over 16 months, whereas the "standard" K-feldspar did not change activity within the uncertainty of the experiment. These results, in combination with a review of the available literature data, are consistent with the previous findings that potassium feldspars are important components of arid or fertile soil dusts for ice nucleation. However, we also show that there is the possibility that some alkali feldspars may have enhanced ice nucleating abilities, which could have implications for prediction of ice nucleating particle concentrations in the atmosphere.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
Journal or Publication Title: | Atmospheric Chemistry and Physics | ||||||
ISSN: | 1680-7324 | ||||||
Official Date: | 5 September 2016 | ||||||
Dates: |
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Volume: | 16 | ||||||
Number: | 17 | ||||||
Page Range: | pp. 10927-10940 | ||||||
DOI: | 10.5194/acp-16-10927-2016 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 12 September 2019 | ||||||
Date of first compliant Open Access: | 12 September 2019 |
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