Effect of impurities on grain growth in cold ice sheets
On the basis of a detailed study of the ice microstructure of the European Project for Ice Coring in Antarctica (EPICA) ice core at Dome Concordia, Antarctica, we analyze the effect of impurities (solubles, and insolubles, that is, dust particles) on the grain growth process in cold ice sheets. As a...
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American Geophysical Union
2006
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ftdatacite:10.48350/158301 2023-05-15T13:52:47+02:00 Effect of impurities on grain growth in cold ice sheets Durand, G. Weiss, J. Lipenkov, V. Barnola, J. M. Krinner, G. Parrenin, F. Delmonte, B. Ritz, C. Duval, P. Röthlisberger, R. Bigler, M. 2006 https://dx.doi.org/10.48350/158301 https://boris.unibe.ch/158301/ unknown American Geophysical Union open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 530 Physics Text article-journal journal article ScholarlyArticle 2006 ftdatacite https://doi.org/10.48350/158301 2021-11-05T12:55:41Z On the basis of a detailed study of the ice microstructure of the European Project for Ice Coring in Antarctica (EPICA) ice core at Dome Concordia, Antarctica, we analyze the effect of impurities (solubles, and insolubles, that is, dust particles) on the grain growth process in cold ice sheets. As a general trend, the average grain size increases with depth. This global increase, induced by the normal grain growth process, is punctuated by several sharp decreases that can be associated with glacial-interglacial climatic transitions. To explain the modifications of the microstructure with climatic changes, we discuss the role of soluble and insoluble impurities on the grain growth process, coupled with an analysis of the pinning of grain boundaries by microparticles. Our data indicate that high soluble impurity content does not necessarily imply a slowdown of grain growth kinetics, whereas the pinning of grain boundaries by dust explains all the observed modifications of the microstructure. We propose a numerical model of the evolution of the average grain size in deep ice cores that takes into account recrystallization processes such as normal grain growth and rotation recrystallization as well as the pinning effect induced by dust particles, bubbles, and clathrates on the grain boundaries. Applied to the first 2135 m of the Dome Concordia core, the model reproduces accurately the measured mean grain radius. This indicates a major role of dust in the modification of polar ice microstructure and shows that the average grain size is not a true paleothermometer, as it is correlated with climatic transitions through the dust content of the ice. Text Antarc* Antarctica EPICA ice core DataCite Metadata Store (German National Library of Science and Technology) |
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530 Physics |
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530 Physics Durand, G. Weiss, J. Lipenkov, V. Barnola, J. M. Krinner, G. Parrenin, F. Delmonte, B. Ritz, C. Duval, P. Röthlisberger, R. Bigler, M. Effect of impurities on grain growth in cold ice sheets |
topic_facet |
530 Physics |
description |
On the basis of a detailed study of the ice microstructure of the European Project for Ice Coring in Antarctica (EPICA) ice core at Dome Concordia, Antarctica, we analyze the effect of impurities (solubles, and insolubles, that is, dust particles) on the grain growth process in cold ice sheets. As a general trend, the average grain size increases with depth. This global increase, induced by the normal grain growth process, is punctuated by several sharp decreases that can be associated with glacial-interglacial climatic transitions. To explain the modifications of the microstructure with climatic changes, we discuss the role of soluble and insoluble impurities on the grain growth process, coupled with an analysis of the pinning of grain boundaries by microparticles. Our data indicate that high soluble impurity content does not necessarily imply a slowdown of grain growth kinetics, whereas the pinning of grain boundaries by dust explains all the observed modifications of the microstructure. We propose a numerical model of the evolution of the average grain size in deep ice cores that takes into account recrystallization processes such as normal grain growth and rotation recrystallization as well as the pinning effect induced by dust particles, bubbles, and clathrates on the grain boundaries. Applied to the first 2135 m of the Dome Concordia core, the model reproduces accurately the measured mean grain radius. This indicates a major role of dust in the modification of polar ice microstructure and shows that the average grain size is not a true paleothermometer, as it is correlated with climatic transitions through the dust content of the ice. |
format |
Text |
author |
Durand, G. Weiss, J. Lipenkov, V. Barnola, J. M. Krinner, G. Parrenin, F. Delmonte, B. Ritz, C. Duval, P. Röthlisberger, R. Bigler, M. |
author_facet |
Durand, G. Weiss, J. Lipenkov, V. Barnola, J. M. Krinner, G. Parrenin, F. Delmonte, B. Ritz, C. Duval, P. Röthlisberger, R. Bigler, M. |
author_sort |
Durand, G. |
title |
Effect of impurities on grain growth in cold ice sheets |
title_short |
Effect of impurities on grain growth in cold ice sheets |
title_full |
Effect of impurities on grain growth in cold ice sheets |
title_fullStr |
Effect of impurities on grain growth in cold ice sheets |
title_full_unstemmed |
Effect of impurities on grain growth in cold ice sheets |
title_sort |
effect of impurities on grain growth in cold ice sheets |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://dx.doi.org/10.48350/158301 https://boris.unibe.ch/158301/ |
genre |
Antarc* Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctica EPICA ice core |
op_rights |
open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.48350/158301 |
_version_ |
1766257475288301568 |