The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding
Abstract Firn describes the interstage product between snow and ice in cold regions of the earth, where annual snow fall exceeds the amount of snow melting. The continuing accumulation of snow leads to its densificiation due to overburden stress until it becomes ice. In the field of glaciology vario...
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crwiley:10.1002/pamm.202100125 2024-06-02T07:57:52+00:00 The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding Schultz, Timm Müller, Ralf Gross, Dietmar Humbert, Angelika 2021 http://dx.doi.org/10.1002/pamm.202100125 https://onlinelibrary.wiley.com/doi/pdf/10.1002/pamm.202100125 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/pamm.202100125 en eng Wiley http://creativecommons.org/licenses/by/4.0/ PAMM volume 21, issue 1 ISSN 1617-7061 1617-7061 journal-article 2021 crwiley https://doi.org/10.1002/pamm.202100125 2024-05-03T11:22:54Z Abstract Firn describes the interstage product between snow and ice in cold regions of the earth, where annual snow fall exceeds the amount of snow melting. The continuing accumulation of snow leads to its densificiation due to overburden stress until it becomes ice. In the field of glaciology various attempts on simulating firn densification have been made and new models are still developed, as the knowledge of the firn column's density structure allows important derivations. The presented study reassesses a model description for low density firn based on the process of grain boundary sliding presented by Alley in 1987 [1] using an optimisation approach. By comparing simulation results to 159 measured firn density profiles from Greenland and Antarctica it finds a possible additional dependency of the constitutive relation on the mean surface mass balance. This result is interpreted as an insufficient description of the stress regime. Article in Journal/Newspaper Antarc* Antarctica Greenland Wiley Online Library Greenland PAMM 21 1 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Firn describes the interstage product between snow and ice in cold regions of the earth, where annual snow fall exceeds the amount of snow melting. The continuing accumulation of snow leads to its densificiation due to overburden stress until it becomes ice. In the field of glaciology various attempts on simulating firn densification have been made and new models are still developed, as the knowledge of the firn column's density structure allows important derivations. The presented study reassesses a model description for low density firn based on the process of grain boundary sliding presented by Alley in 1987 [1] using an optimisation approach. By comparing simulation results to 159 measured firn density profiles from Greenland and Antarctica it finds a possible additional dependency of the constitutive relation on the mean surface mass balance. This result is interpreted as an insufficient description of the stress regime. |
format |
Article in Journal/Newspaper |
author |
Schultz, Timm Müller, Ralf Gross, Dietmar Humbert, Angelika |
spellingShingle |
Schultz, Timm Müller, Ralf Gross, Dietmar Humbert, Angelika The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
author_facet |
Schultz, Timm Müller, Ralf Gross, Dietmar Humbert, Angelika |
author_sort |
Schultz, Timm |
title |
The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
title_short |
The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
title_full |
The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
title_fullStr |
The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
title_full_unstemmed |
The First Stage of Firn Densification ‐ An Evaluation of Grain Boundary Sliding |
title_sort |
first stage of firn densification ‐ an evaluation of grain boundary sliding |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/pamm.202100125 https://onlinelibrary.wiley.com/doi/pdf/10.1002/pamm.202100125 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/pamm.202100125 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
PAMM volume 21, issue 1 ISSN 1617-7061 1617-7061 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/pamm.202100125 |
container_title |
PAMM |
container_volume |
21 |
container_issue |
1 |
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1800741084967469056 |