Encyclopedia

firn snow

firn snow

[′fərn ‚snō]
(hydrology)
firn old snow
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
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.
Four new 'ozone layer-destructing' man-made gases found in atmosphere
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