NDLI: J 2 . 1 Relationship between Optical and Ice Crystal Shapes in Mid-latitude Cirrus Clouds from Polar Nephelometer and Cpi

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J 2 . 1 Relationship between Optical and Ice Crystal Shapes in Mid-latitude Cirrus Clouds from Polar Nephelometer and Cpi

Content Provider	Semantic Scholar
Author	Jean Gayet, François Mioche, Guillaume Shcherbakov, Valéry Gourbeyre, Christophe Reinhold Busen Minikin, Andreas
Copyright Year	2010
Abstract	Optical phenomena like 22° halo and 46° halo were first explained by Mariotte (1717) as due to refraction of light (in the visible) by randomly oriented hexagonal ice crystals. Modelling studies of scattering phase functions show that these features are indication of highly regular pristine ice crystals (see among others Ping Yang et al., 2001). In this communication we describe two cases of in situ observations of cirrus clouds with both having mostly planar-plate ice crystals but with significant differences in optical properties in terms of 22° Halo occurrences. For one case, despite the fact that Polar Nephelometer data do not reveal any signature of 22° (and 46°) halos, preferential horizontal orientation of these plate-shaped crystals can explain systematic larger Lidar CALIOP retrieved extinctions compared to collocated in situ measurements (Mioche et al., 2010). For the second case, well-marked 22° halo features are observed along with prevalent planar-plate ice crystals. The interpretation of these results are discussed from a careful analysis of the ice particle morphologies and by using a theoretical model of light scattering (Shcherbakov et al., 2006). Implications for realistic modelling of scattering properties of cirrus clouds are given.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ams.confex.com/ams/pdfpapers/170326.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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