Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector
Mass loss from ice sheets contributes to global sea level rise, and accelerated ice flow to the oceans is one of the major causes of rapid ice sheet mass loss. To understand flow dynamics of polar ice sheets, we need to understand deformation mechanisms of the polycrystalline ice in ice sheets. Labo...
Published in: | Bulletin of Glaciological Research |
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Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://curis.ku.dk/portal/da/publications/microstructural-analysis-of-greenland-ice-using-a-cryogenic-scanning-electron-microscope-equipped-with-an-electron-backscatter-diffraction-detector(d470c3f6-331f-419a-8a73-1acf550214c3).html https://doi.org/10.5331/BGR.19R01 https://curis.ku.dk/ws/files/255355555/37_19R01.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/d470c3f6-331f-419a-8a73-1acf550214c3 2023-12-10T09:49:04+01:00 Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector Shigeyama, Wataru Nagatsuka, Naoko Homma, Tomoyuki Takata, Morimasa Goto-Azuma, Kumiko Weikusat, Ilka Drury, Martyn R. Kuiper, Ernst Jan N. Mateiu, Ramona V. Azuma, Nobuhiko Dahl-Jensen, Dorthe Kipfstuhl, Sepp 2019 application/pdf https://curis.ku.dk/portal/da/publications/microstructural-analysis-of-greenland-ice-using-a-cryogenic-scanning-electron-microscope-equipped-with-an-electron-backscatter-diffraction-detector(d470c3f6-331f-419a-8a73-1acf550214c3).html https://doi.org/10.5331/BGR.19R01 https://curis.ku.dk/ws/files/255355555/37_19R01.pdf eng eng info:eu-repo/semantics/openAccess Shigeyama , W , Nagatsuka , N , Homma , T , Takata , M , Goto-Azuma , K , Weikusat , I , Drury , M R , Kuiper , E J N , Mateiu , R V , Azuma , N , Dahl-Jensen , D & Kipfstuhl , S 2019 , ' Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector ' , Bulletin of Glaciological Research , vol. 37 , 9R01 , pp. 31-45 . https://doi.org/10.5331/BGR.19R01 Cloudy band Cryogenic ESEM/EBSD Greenland ice sheet Microstructure NEEM ice core article 2019 ftcopenhagenunip https://doi.org/10.5331/BGR.19R01 2023-11-16T00:04:57Z Mass loss from ice sheets contributes to global sea level rise, and accelerated ice flow to the oceans is one of the major causes of rapid ice sheet mass loss. To understand flow dynamics of polar ice sheets, we need to understand deformation mechanisms of the polycrystalline ice in ice sheets. Laboratory experiments have shown that deformation of polycrystalline ice occurs largely by dislocation glide, which mainly depends on crystal orientation distribution. Grain size and impurities are also important factors that determine ice deformation mechanisms. Compared with ice formed during interglacial periods, ice formed during glacial periods, especially ice that forms cloudy bands, exhibits finer grain sizes and higher impurity concentrations. A previous report suggests the deformation rate of ice containing cloudy bands is higher than that of ice without cloudy bands. To examine the microstructures and deformation histories of ice in cloudy bands, we applied the electron backscatter diffraction (EBSD) technique to samples from the Greenland Ice Sheet using an environmental scanning electron microscope (ESEM) equipped with cold stages. Prior to the EBSD analysis, we optimised our ESEM/EBSD system and performed angular error assessment using artificial ice. In terms of c-and a-axis orientation distributions and grain orientation spread, we found little difference between samples taken from a cloudy band and those taken from an adjacent layer of clear ice. However, subgrain boundary density and orientation gradients were higher in the cloudy band, suggesting that there are more dislocations in the cloudy band than in the clear ice layer. Article in Journal/Newspaper Greenland ice core Ice Sheet University of Copenhagen: Research Greenland Bulletin of Glaciological Research 37 0 31 45 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Cloudy band Cryogenic ESEM/EBSD Greenland ice sheet Microstructure NEEM ice core |
spellingShingle |
Cloudy band Cryogenic ESEM/EBSD Greenland ice sheet Microstructure NEEM ice core Shigeyama, Wataru Nagatsuka, Naoko Homma, Tomoyuki Takata, Morimasa Goto-Azuma, Kumiko Weikusat, Ilka Drury, Martyn R. Kuiper, Ernst Jan N. Mateiu, Ramona V. Azuma, Nobuhiko Dahl-Jensen, Dorthe Kipfstuhl, Sepp Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
topic_facet |
Cloudy band Cryogenic ESEM/EBSD Greenland ice sheet Microstructure NEEM ice core |
description |
Mass loss from ice sheets contributes to global sea level rise, and accelerated ice flow to the oceans is one of the major causes of rapid ice sheet mass loss. To understand flow dynamics of polar ice sheets, we need to understand deformation mechanisms of the polycrystalline ice in ice sheets. Laboratory experiments have shown that deformation of polycrystalline ice occurs largely by dislocation glide, which mainly depends on crystal orientation distribution. Grain size and impurities are also important factors that determine ice deformation mechanisms. Compared with ice formed during interglacial periods, ice formed during glacial periods, especially ice that forms cloudy bands, exhibits finer grain sizes and higher impurity concentrations. A previous report suggests the deformation rate of ice containing cloudy bands is higher than that of ice without cloudy bands. To examine the microstructures and deformation histories of ice in cloudy bands, we applied the electron backscatter diffraction (EBSD) technique to samples from the Greenland Ice Sheet using an environmental scanning electron microscope (ESEM) equipped with cold stages. Prior to the EBSD analysis, we optimised our ESEM/EBSD system and performed angular error assessment using artificial ice. In terms of c-and a-axis orientation distributions and grain orientation spread, we found little difference between samples taken from a cloudy band and those taken from an adjacent layer of clear ice. However, subgrain boundary density and orientation gradients were higher in the cloudy band, suggesting that there are more dislocations in the cloudy band than in the clear ice layer. |
format |
Article in Journal/Newspaper |
author |
Shigeyama, Wataru Nagatsuka, Naoko Homma, Tomoyuki Takata, Morimasa Goto-Azuma, Kumiko Weikusat, Ilka Drury, Martyn R. Kuiper, Ernst Jan N. Mateiu, Ramona V. Azuma, Nobuhiko Dahl-Jensen, Dorthe Kipfstuhl, Sepp |
author_facet |
Shigeyama, Wataru Nagatsuka, Naoko Homma, Tomoyuki Takata, Morimasa Goto-Azuma, Kumiko Weikusat, Ilka Drury, Martyn R. Kuiper, Ernst Jan N. Mateiu, Ramona V. Azuma, Nobuhiko Dahl-Jensen, Dorthe Kipfstuhl, Sepp |
author_sort |
Shigeyama, Wataru |
title |
Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
title_short |
Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
title_full |
Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
title_fullStr |
Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
title_full_unstemmed |
Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
title_sort |
microstructural analysis of greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector |
publishDate |
2019 |
url |
https://curis.ku.dk/portal/da/publications/microstructural-analysis-of-greenland-ice-using-a-cryogenic-scanning-electron-microscope-equipped-with-an-electron-backscatter-diffraction-detector(d470c3f6-331f-419a-8a73-1acf550214c3).html https://doi.org/10.5331/BGR.19R01 https://curis.ku.dk/ws/files/255355555/37_19R01.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
Shigeyama , W , Nagatsuka , N , Homma , T , Takata , M , Goto-Azuma , K , Weikusat , I , Drury , M R , Kuiper , E J N , Mateiu , R V , Azuma , N , Dahl-Jensen , D & Kipfstuhl , S 2019 , ' Microstructural analysis of Greenland ice using a cryogenic scanning electron microscope equipped with an electron backscatter diffraction detector ' , Bulletin of Glaciological Research , vol. 37 , 9R01 , pp. 31-45 . https://doi.org/10.5331/BGR.19R01 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5331/BGR.19R01 |
container_title |
Bulletin of Glaciological Research |
container_volume |
37 |
container_issue |
0 |
container_start_page |
31 |
op_container_end_page |
45 |
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1784893354359652352 |