Firn Densification: An Empirical Model
Open Access
- 1 January 1980
- journal article
- Published by International Glaciological Society in Journal of Glaciology
- Vol. 25 (93), 373-385
- https://doi.org/10.3189/s0022143000015239
Abstract
An empirical model of firn densification from the surface to the zone of pore close-off has been constructed. Fundamental rate equations have been derived for the first two stages of densification. In the first stage, for densities less than 0.55 Mg m−3, the densification rate is proportional to the mean annual accumulation times the term (ρi − ρ), where ρ is the density of the snow and ρi is the density of pure ice. The densification rate in the second stage, where 0.55 Mg m −3 < ρ < 0.8 Mg m−3, is proportional to the square root of the accumulation rate and to (ρi− ρ). Depth–density and depth–age calculations from this model are compared with observation. Model accumulation rates are within about 20% of values obtained by other techniques. It is suggested that depth intervals of constant density in some Antarctic cores may represent a synchronous event in the 1880 ’s when ten times the normal accumulation fell within a year or two.This publication has 8 references indexed in Scilit:
- Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental DustJournal of Glaciology, 1978
- Secular Trends of Accumulation Rates at Three Greenland StationsJournal of Glaciology, 1978
- Investigation of Polar Snow Using Seismic Velocity GradientsJournal of Glaciology, 1975
- Stratigraphic Analysis of a Deep Ice Core from GreenlandPublished by Geological Society of America ,1970
- Correction Factor for Accumulation Measured by the Thickness of the Annual Layers in an Ice SheetJournal of Glaciology, 1963
- Deep Drilling at Base Roi Baudouin, Dronning Maud Land, AntarcticaJournal of Glaciology, 1962
- I.G.Y. Glaciological Work at Wilkes Station, AntarcticaJournal of Glaciology, 1961
- Sorge’s Law of Densification of Snow on High Polar GlaciersJournal of Glaciology, 1953