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Record #91939:

Concerning the deposition and diagenesis of strata in polar firn / Richard B. Alley.

Title: Concerning the deposition and diagenesis of strata in polar firn / Richard B. Alley.
Author(s): Alley, Richard B.
Date: 1988.
In: Journal of Glaciology. (1988.), Vol. 34(118) (1988)
Abstract: Based on results of surficial and shallow-pit studies conducted in Greenland and Antarctica (Siple Coast). Depth hoar in firn forms when large temperature gradients act on low-density firn, but high-density firn does not develop into depth hoar. Low densities in firn may be depositional (burial of surface hoar or still-air snowfall) or diagenetic (mass loss to free atmosphere); however, diagenesis is sufficiently strong to cause significant mass loss only in top 50 to 100 mm of firn. Between about 50 to 100 mm and 2 m depth, grain growth and densification are accelerated strongly by temperature-gradient effects; from 2 to 5 m, temperature gradients have small but measurable effect on rates of processes in firn, and below 5 m rates essentially have isothermal values. Diagenetic depth-hoar layers typically develop in autumn, are relatively thick, and have smooth bases. Depositional depth-hoar layers may develop at any season, are relatively thin, and have irregular bases. In low-accumulation regions, visual stratification may preserve annual signal only, but in high-accumulation regions individual storms or other features may be recognizable.
Notes:

Journal of Glaciology. Vol. 34(118) :283-290 (1988).

Keywords: 551.578.465 -- Snow cover, stratification.
551.574.42 -- Rime, hoarfrost and glazed frost.
E10 -- Glaciology: snow and avalanches.
(*7) -- Antarctic regions.
(*38) -- Greenland.
SPRI record no.: 91939

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245 10 ‡aConcerning the deposition and diagenesis of strata in polar firn /‡cRichard B. Alley.
260 ## ‡a[S.l.] :‡b[s.n.],‡c1988.
300 ## ‡ap. 283-290 :‡bdiags., table, maps.
500 ## ‡aJournal of Glaciology. Vol. 34(118) :283-290 (1988).
520 3# ‡aBased on results of surficial and shallow-pit studies conducted in Greenland and Antarctica (Siple Coast). Depth hoar in firn forms when large temperature gradients act on low-density firn, but high-density firn does not develop into depth hoar. Low densities in firn may be depositional (burial of surface hoar or still-air snowfall) or diagenetic (mass loss to free atmosphere); however, diagenesis is sufficiently strong to cause significant mass loss only in top 50 to 100 mm of firn. Between about 50 to 100 mm and 2 m depth, grain growth and densification are accelerated strongly by temperature-gradient effects; from 2 to 5 m, temperature gradients have small but measurable effect on rates of processes in firn, and below 5 m rates essentially have isothermal values. Diagenetic depth-hoar layers typically develop in autumn, are relatively thick, and have smooth bases. Depositional depth-hoar layers may develop at any season, are relatively thin, and have irregular bases. In low-accumulation regions, visual stratification may preserve annual signal only, but in high-accumulation regions individual storms or other features may be recognizable.
650 07 ‡a551.578.465 -- Snow cover, stratification.‡2udc
650 07 ‡a551.574.42 -- Rime, hoarfrost and glazed frost.‡2udc
650 07 ‡aE10 -- Glaciology: snow and avalanches.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*38) -- Greenland.‡2udc
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