Formation of the Ice Core Isotopic Composition
Main processes of the ice core isotopic composition formation are overviewed. Theory of isotope-temperature relationship is discussed and confirmed by a number of experimental data. The factors related to wind-driven spatial snow redistribution and post-depositional isotopic changes that may alter o...
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Institute of Low Temperature Science, Hokkaido University
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/45456 2023-05-15T13:42:37+02:00 Formation of the Ice Core Isotopic Composition Ekaykin, Alexey A. Lipenkov, Vladimir Ya. http://hdl.handle.net/2115/45456 eng eng Institute of Low Temperature Science, Hokkaido University Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh http://hdl.handle.net/2115/45456 Antarctica Vostok station ice core isotopic composition paleo-climate Lake Vostok 400 bulletin (article) fthokunivhus 2022-11-18T01:02:09Z Main processes of the ice core isotopic composition formation are overviewed. Theory of isotope-temperature relationship is discussed and confirmed by a number of experimental data. The factors related to wind-driven spatial snow redistribution and post-depositional isotopic changes that may alter or weaken this relationship, are also considered. For high-resolution isotopic time-series obtained at sites with low accumulation of snow, the signal-to-noise ratio is shown to be as low as 0.25, which means that noise accounts for about 80 % of the total variance. It is demonstrated that "classical isotopic method" (based on the present-day geographical isotope-temperature slope) underestimates the amplitude of past temperature changes in Antarctica. The most likely reason for the discrepancy is the change in the moisture source conditions. After correction for the latter, the paleo-temperature reconstructions produced by the isotopic method become consistent with those obtained from borehole temperature measurements. We show that in the case of the Vostok ice core, both approaches lead to the same temperature shift of 10℃ between LGM and the present time. The isotopic composition of the basal part of the Vostok ice core, comprising frozen subglacial Lake Vostok water, is also discussed. IV. Chemical properties and isotopes Article in Journal/Newspaper Antarc* Antarctica ice core Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) Vostok Station ENVELOPE(106.837,106.837,-78.464,-78.464) |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctica Vostok station ice core isotopic composition paleo-climate Lake Vostok 400 |
spellingShingle |
Antarctica Vostok station ice core isotopic composition paleo-climate Lake Vostok 400 Ekaykin, Alexey A. Lipenkov, Vladimir Ya. Formation of the Ice Core Isotopic Composition |
topic_facet |
Antarctica Vostok station ice core isotopic composition paleo-climate Lake Vostok 400 |
description |
Main processes of the ice core isotopic composition formation are overviewed. Theory of isotope-temperature relationship is discussed and confirmed by a number of experimental data. The factors related to wind-driven spatial snow redistribution and post-depositional isotopic changes that may alter or weaken this relationship, are also considered. For high-resolution isotopic time-series obtained at sites with low accumulation of snow, the signal-to-noise ratio is shown to be as low as 0.25, which means that noise accounts for about 80 % of the total variance. It is demonstrated that "classical isotopic method" (based on the present-day geographical isotope-temperature slope) underestimates the amplitude of past temperature changes in Antarctica. The most likely reason for the discrepancy is the change in the moisture source conditions. After correction for the latter, the paleo-temperature reconstructions produced by the isotopic method become consistent with those obtained from borehole temperature measurements. We show that in the case of the Vostok ice core, both approaches lead to the same temperature shift of 10℃ between LGM and the present time. The isotopic composition of the basal part of the Vostok ice core, comprising frozen subglacial Lake Vostok water, is also discussed. IV. Chemical properties and isotopes |
format |
Article in Journal/Newspaper |
author |
Ekaykin, Alexey A. Lipenkov, Vladimir Ya. |
author_facet |
Ekaykin, Alexey A. Lipenkov, Vladimir Ya. |
author_sort |
Ekaykin, Alexey A. |
title |
Formation of the Ice Core Isotopic Composition |
title_short |
Formation of the Ice Core Isotopic Composition |
title_full |
Formation of the Ice Core Isotopic Composition |
title_fullStr |
Formation of the Ice Core Isotopic Composition |
title_full_unstemmed |
Formation of the Ice Core Isotopic Composition |
title_sort |
formation of the ice core isotopic composition |
publisher |
Institute of Low Temperature Science, Hokkaido University |
url |
http://hdl.handle.net/2115/45456 |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) ENVELOPE(106.837,106.837,-78.464,-78.464) |
geographic |
Lake Vostok Vostok Station |
geographic_facet |
Lake Vostok Vostok Station |
genre |
Antarc* Antarctica ice core |
genre_facet |
Antarc* Antarctica ice core |
op_relation |
Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh http://hdl.handle.net/2115/45456 |
_version_ |
1766170128093806592 |