polar firn

polar firn

[′pō·lər ′fərn]
(hydrology)
Firn formed at low temperatures with no melting or liquid water present. Also known as dry firn.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The researchers, who compared today's air samples with air trapped in polar firn snow air collected between 1978 and 2012 in unpolluted Tasmania, revealed that all four new gases have been recently released, while two are significantly accumulating.
During the densification of polar firn, significant changes of the microstructure can be observed (cf.
Microstructure-dependent densification of polar firn derived from x-ray microtomography.