Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study
Abstract We performed microscopic observations and a statistical study of the number, size and shape distribution of clathrates in the GRIP (Greenland Ice Core Project) deep ice core, using 185 samples from a depth range of 1016–3014 m, spanning a period of 6 to >110 ka BP and encompassing the Ho...
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Language: | English |
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Cambridge University Press (CUP)
1999
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Online Access: | http://dx.doi.org/10.1017/s0022143000003002 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003002 |
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crcambridgeupr:10.1017/s0022143000003002 2024-04-07T07:52:50+00:00 Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study Pauer, F. Kipfstuhl, S. Kuhs, W. F. Shoji, H. 1999 http://dx.doi.org/10.1017/s0022143000003002 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003002 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Glaciology volume 45, issue 149, page 22-30 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000003002 2024-03-08T00:36:18Z Abstract We performed microscopic observations and a statistical study of the number, size and shape distribution of clathrates in the GRIP (Greenland Ice Core Project) deep ice core, using 185 samples from a depth range of 1016–3014 m, spanning a period of 6 to >110 ka BP and encompassing the Holocene, Wisconsin and Eemian periods. The number concentration of the clathrates varied considerably with climatic changes. It was possible to detect the rapid climatic oscillations in the last glacial between 13 and 110 ka BP , the Dansgaard–Oeschger cycles, in the number-concentration profile of clathrates. The mean volume of clathrates is less clearly influenced by climatic factors, with a tendency towards greater volumes in warmer periods, but also a growth of clathrates with depth could be detected. This growth rate was calculated to be 3.1 × 10 -12 cm 3 a -1 . The amount of gases captured in the clathrates is estimated to be significantly smaller than the total amount of air determined by gas-concentration measurements. This points to diffusion processes of atmospheric gases within the ice matrix. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project GRIP ice core Journal of Glaciology Cambridge University Press Greenland Journal of Glaciology 45 149 22 30 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Pauer, F. Kipfstuhl, S. Kuhs, W. F. Shoji, H. Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
topic_facet |
Earth-Surface Processes |
description |
Abstract We performed microscopic observations and a statistical study of the number, size and shape distribution of clathrates in the GRIP (Greenland Ice Core Project) deep ice core, using 185 samples from a depth range of 1016–3014 m, spanning a period of 6 to >110 ka BP and encompassing the Holocene, Wisconsin and Eemian periods. The number concentration of the clathrates varied considerably with climatic changes. It was possible to detect the rapid climatic oscillations in the last glacial between 13 and 110 ka BP , the Dansgaard–Oeschger cycles, in the number-concentration profile of clathrates. The mean volume of clathrates is less clearly influenced by climatic factors, with a tendency towards greater volumes in warmer periods, but also a growth of clathrates with depth could be detected. This growth rate was calculated to be 3.1 × 10 -12 cm 3 a -1 . The amount of gases captured in the clathrates is estimated to be significantly smaller than the total amount of air determined by gas-concentration measurements. This points to diffusion processes of atmospheric gases within the ice matrix. |
format |
Article in Journal/Newspaper |
author |
Pauer, F. Kipfstuhl, S. Kuhs, W. F. Shoji, H. |
author_facet |
Pauer, F. Kipfstuhl, S. Kuhs, W. F. Shoji, H. |
author_sort |
Pauer, F. |
title |
Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
title_short |
Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
title_full |
Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
title_fullStr |
Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
title_full_unstemmed |
Air clathrate crystals from the GRIP deep ice core, Greenland: a number-, size- and shape-distribution study |
title_sort |
air clathrate crystals from the grip deep ice core, greenland: a number-, size- and shape-distribution study |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000003002 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003002 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core Journal of Glaciology |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core Journal of Glaciology |
op_source |
Journal of Glaciology volume 45, issue 149, page 22-30 ISSN 0022-1430 1727-5652 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022143000003002 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
149 |
container_start_page |
22 |
op_container_end_page |
30 |
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1795668321720336384 |