Annual layers in polar firn detected by Borehole Optical Stratigraphy.
firn cores will be analyzed in the field to see variability in snowfall.
nix, nivis, snow) is adopted from the French dialect of the French Alps; firn is German, meaning "last year's (snow)."
At first it becomes more coarse-grained, like the Firn Schnee of the Alps, and is moist by melting during the summer.
Purtscheller, Uber Fels and Firn (1901); E.