Specific surface area, density and microstructure of frost flowers

Details Specific surface area, density and microstructure of frost flowers Specific surface area, density and microstructure of frost flowers

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213502d&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 13, CiteID L13502

Other

23

Cryosphere: Snow (1827, 1863), Cryosphere: Sea Ice (4540), Cryosphere: Leads (4540)

Scientific paper

Frost flowers often grow on new sea ice. They are thought to have a high specific surface area (SSA) that provides sites for heterogeneous reactions. We have measured the SSA of frost flowers using CH4 adsorption at 77 K and obtained a value of 185 (+80 -50) cm2/g, much lower than inferred by others. Their density is 0.02 g/cm3. We calculate that the total surface area of frost flowers is 1.4 m2 per m2 of ice surface, so that they do not increase the ice surface area significantly. Their role as sites for enhanced heterogeneous reactions should be reconsidered. Frost flowers also commonly grow on fresh water and the saline brine seen on young sea ice is not necessary for their growth. Photo- and electro-micrographs reveal hollow and concave structures, typical of very fast growing crystals. The brine that wicks up frost flowers considerably perturbs their growth.

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