The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica
The firnificaton of dry polar snow has been investigated with the means of X-ray micro-computer tomography (CT). The measurements were carried out on shallow firn cores and snow pit samples during the field campaign 2005/2006 at the EPICA (European Project of Ice Coring in Antarctica) DML-drill site...
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ftawi:oai:epic.awi.de:15873 2024-09-15T17:45:27+00:00 The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica Freitag, Johannes Kipfstuhl, Sepp Faria, S. H. 2006 https://epic.awi.de/id/eprint/15873/ https://hdl.handle.net/10013/epic.25932 unknown Freitag, J. orcid:0000-0003-2654-9440 , Kipfstuhl, S. and Faria, S. H. (2006) The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica , 11th International Conference on the Physics and Chemistry of Ice, PCI, Bremerhaven, Germany.7.-28.7.2006. . hdl:10013/epic.25932 EPIC311th International Conference on the Physics and Chemistry of Ice, PCI, Bremerhaven, Germany.7.-28.7.2006., 23 Conference notRev 2006 ftawi 2024-06-24T03:59:21Z The firnificaton of dry polar snow has been investigated with the means of X-ray micro-computer tomography (CT). The measurements were carried out on shallow firn cores and snow pit samples during the field campaign 2005/2006 at the EPICA (European Project of Ice Coring in Antarctica) DML-drill site, Antarctica. The CT-devices have been successfully tested in the field and offered us a novel method to study the fragile three dimensional structures of deposited snow and firn.In this presentation we focus on the evolution of pore/ice cluster sizes and on the development of intergranular bonding. The parameters are derived from volume image analysis of the three-dimensional CT-reconstructions. We show that the number of bonds per cluster in samples near the surface is highly correlated to their respective density. Accordingly, the neck radii are anticorrelated to the density. Maxima of pore size and anisotropy are observed at depths where the metamorphism is dominated by temperature gradients. The relevance of experimental findings is discussed in relation to recent firnification models. Conference Object Antarc* Antarctica DML Dronning Maud Land EPICA Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The firnificaton of dry polar snow has been investigated with the means of X-ray micro-computer tomography (CT). The measurements were carried out on shallow firn cores and snow pit samples during the field campaign 2005/2006 at the EPICA (European Project of Ice Coring in Antarctica) DML-drill site, Antarctica. The CT-devices have been successfully tested in the field and offered us a novel method to study the fragile three dimensional structures of deposited snow and firn.In this presentation we focus on the evolution of pore/ice cluster sizes and on the development of intergranular bonding. The parameters are derived from volume image analysis of the three-dimensional CT-reconstructions. We show that the number of bonds per cluster in samples near the surface is highly correlated to their respective density. Accordingly, the neck radii are anticorrelated to the density. Maxima of pore size and anisotropy are observed at depths where the metamorphism is dominated by temperature gradients. The relevance of experimental findings is discussed in relation to recent firnification models. |
format |
Conference Object |
author |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. H. |
spellingShingle |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. H. The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
author_facet |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. H. |
author_sort |
Freitag, Johannes |
title |
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
title_short |
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
title_full |
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
title_fullStr |
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
title_full_unstemmed |
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica |
title_sort |
firnification of snow measured by x-ray-micro-tomography at the epica-drill site dronning maud land (dml), antarctica |
publishDate |
2006 |
url |
https://epic.awi.de/id/eprint/15873/ https://hdl.handle.net/10013/epic.25932 |
genre |
Antarc* Antarctica DML Dronning Maud Land EPICA |
genre_facet |
Antarc* Antarctica DML Dronning Maud Land EPICA |
op_source |
EPIC311th International Conference on the Physics and Chemistry of Ice, PCI, Bremerhaven, Germany.7.-28.7.2006., 23 |
op_relation |
Freitag, J. orcid:0000-0003-2654-9440 , Kipfstuhl, S. and Faria, S. H. (2006) The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica , 11th International Conference on the Physics and Chemistry of Ice, PCI, Bremerhaven, Germany.7.-28.7.2006. . hdl:10013/epic.25932 |
_version_ |
1810493278388224000 |