In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica
The firnificaton of dry polar firn 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:17546 2024-09-15T17:46:35+00:00 In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica Freitag, Johannes Kipfstuhl, Sepp Faria, S. 2007 https://epic.awi.de/id/eprint/17546/ https://hdl.handle.net/10013/epic.27906 unknown Freitag, J. orcid:0000-0003-2654-9440 , Kipfstuhl, S. and Faria, S. (2007) In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica , EGU ViennaApril 2007. . hdl:10013/epic.27906 EPIC3EGU ViennaApril 2007., 15 Conference notRev 2007 ftawi 2024-06-24T04:00:13Z The firnificaton of dry polar firn 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. Several events of dune formation have been observed during the summer campaign. The dunes are well preserved in the deeper snow with the consequence of highly stratified firn. In this presentation we give a detailed description of stratigraphy with the focus on the evolution of pore/ice cluster sizes and intergranular bonding. 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 2 to 3 meter depth where the metamorphism is dominated by temperature gradients. To highlight the methodological aspect we present different size parametrisations and discuss the three dimensional CT- approach in relation to the standard two dimensional techniques. 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 |
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description |
The firnificaton of dry polar firn 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. Several events of dune formation have been observed during the summer campaign. The dunes are well preserved in the deeper snow with the consequence of highly stratified firn. In this presentation we give a detailed description of stratigraphy with the focus on the evolution of pore/ice cluster sizes and intergranular bonding. 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 2 to 3 meter depth where the metamorphism is dominated by temperature gradients. To highlight the methodological aspect we present different size parametrisations and discuss the three dimensional CT- approach in relation to the standard two dimensional techniques. |
format |
Conference Object |
author |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. |
spellingShingle |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
author_facet |
Freitag, Johannes Kipfstuhl, Sepp Faria, S. |
author_sort |
Freitag, Johannes |
title |
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
title_short |
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
title_full |
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
title_fullStr |
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
title_full_unstemmed |
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica |
title_sort |
in situ x-ray-micro-tomography of snow at the epica-drill site dronning maud land (dml) antarctica |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/17546/ https://hdl.handle.net/10013/epic.27906 |
genre |
Antarc* Antarctica DML Dronning Maud Land EPICA |
genre_facet |
Antarc* Antarctica DML Dronning Maud Land EPICA |
op_source |
EPIC3EGU ViennaApril 2007., 15 |
op_relation |
Freitag, J. orcid:0000-0003-2654-9440 , Kipfstuhl, S. and Faria, S. (2007) In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica , EGU ViennaApril 2007. . hdl:10013/epic.27906 |
_version_ |
1810494847922995200 |