Firn Densification: An Empirical Model
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 proporti...
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Language: | English |
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Cambridge University Press (CUP)
1980
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Online Access: | http://dx.doi.org/10.1017/s0022143000015239 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015239 |
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crcambridgeupr:10.1017/s0022143000015239 2024-09-09T19:10:12+00:00 Firn Densification: An Empirical Model Herron, Michael M. Langway, Chester C. 1980 http://dx.doi.org/10.1017/s0022143000015239 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015239 en eng Cambridge University Press (CUP) Journal of Glaciology volume 25, issue 93, page 373-385 ISSN 0022-1430 1727-5652 journal-article 1980 crcambridgeupr https://doi.org/10.1017/s0022143000015239 2024-08-07T04:04:20Z 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 ( ρ i − ρ ), where ρ is the density of the snow and ρ i 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 ( ρ i− 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. Article in Journal/Newspaper Antarc* Antarctic Journal of Glaciology Cambridge University Press Antarctic Journal of Glaciology 25 93 373 385 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
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 ( ρ i − ρ ), where ρ is the density of the snow and ρ i 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 ( ρ i− 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. |
format |
Article in Journal/Newspaper |
author |
Herron, Michael M. Langway, Chester C. |
spellingShingle |
Herron, Michael M. Langway, Chester C. Firn Densification: An Empirical Model |
author_facet |
Herron, Michael M. Langway, Chester C. |
author_sort |
Herron, Michael M. |
title |
Firn Densification: An Empirical Model |
title_short |
Firn Densification: An Empirical Model |
title_full |
Firn Densification: An Empirical Model |
title_fullStr |
Firn Densification: An Empirical Model |
title_full_unstemmed |
Firn Densification: An Empirical Model |
title_sort |
firn densification: an empirical model |
publisher |
Cambridge University Press (CUP) |
publishDate |
1980 |
url |
http://dx.doi.org/10.1017/s0022143000015239 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015239 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Journal of Glaciology |
genre_facet |
Antarc* Antarctic Journal of Glaciology |
op_source |
Journal of Glaciology volume 25, issue 93, page 373-385 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000015239 |
container_title |
Journal of Glaciology |
container_volume |
25 |
container_issue |
93 |
container_start_page |
373 |
op_container_end_page |
385 |
_version_ |
1809824812271403008 |