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Specific surface area, density and microstructure of frost flowers
Author(s) -
Domine Florent,
Taillandier Anne Sophie,
Simpson William R.,
Severin Ken
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023245
Subject(s) - frost (temperature) , brine , microstructure , geology , sea ice , materials science , chemistry , oceanography , composite material , geomorphology , organic chemistry
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 CH 4 adsorption at 77 K and obtained a value of 185 (+80 −50) cm 2 /g, much lower than inferred by others. Their density is 0.02 g/cm 3 . We calculate that the total surface area of frost flowers is 1.4 m 2 per m 2 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.