Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok
Drilling fluid (DF) is one of the main sources of chemical and biological contamination of deep ice cores and lake water samples in the exploration of Subgalcial Antarctic Lake Environments (SALE). In this study, we investigated the contamination of an ice core that represented the first samples of...
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ftdatacite:10.6084/m9.figshare.c.3783641.v1 2023-05-15T13:43:34+02:00 Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok Alekhina, Irina Ekaykin, Alexey Moskvin, Alexey Lipenkov, Vladimir 2017 https://dx.doi.org/10.6084/m9.figshare.c.3783641.v1 https://figshare.com/collections/Chemical_characteristics_of_the_ice_cores_obtained_after_the_first_unsealing_of_subglacial_Lake_Vostok/3783641/1 unknown Figshare https://dx.doi.org/10.1144/sp461.3 https://dx.doi.org/10.6084/m9.figshare.c.3783641 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3783641.v1 https://doi.org/10.1144/sp461.3 https://doi.org/10.6084/m9.figshare.c.3783641 2021-11-05T12:55:41Z Drilling fluid (DF) is one of the main sources of chemical and biological contamination of deep ice cores and lake water samples in the exploration of Subgalcial Antarctic Lake Environments (SALE). In this study, we investigated the contamination of an ice core that represented the first samples of refrozen lake water obtained 1 year after the unsealing of Lake Vostok in 2012. We show that these samples contain inclusions of the DF with a concentration of at least 16.7 mg l 1 (0.0019% or 19 ppmv). This makes it extremely difficult to obtain reliable data on the real chemical composition of the lake water. The focus of our study is the organic components of the DF, which built up in the secondary ice while the water was freezing in the borehole. Of all the possible organic compounds of the DF, only phenol congeners (up to 32.4 mg 1 ) and ichlorofluoroethane HCFC-141b (14.4 mg 1 ), a DF densifier, were found in the central channel, which is the last part of the core to freeze in the borehole. We conclude that the phenol compounds emerge due to physical processes, namely fractionation, during freezing, rather than any chemical reaction between the DF and the lake water. Article in Journal/Newspaper Antarc* Antarctic ice core DataCite Metadata Store (German National Library of Science and Technology) Antarctic Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Alekhina, Irina Ekaykin, Alexey Moskvin, Alexey Lipenkov, Vladimir Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
Drilling fluid (DF) is one of the main sources of chemical and biological contamination of deep ice cores and lake water samples in the exploration of Subgalcial Antarctic Lake Environments (SALE). In this study, we investigated the contamination of an ice core that represented the first samples of refrozen lake water obtained 1 year after the unsealing of Lake Vostok in 2012. We show that these samples contain inclusions of the DF with a concentration of at least 16.7 mg l 1 (0.0019% or 19 ppmv). This makes it extremely difficult to obtain reliable data on the real chemical composition of the lake water. The focus of our study is the organic components of the DF, which built up in the secondary ice while the water was freezing in the borehole. Of all the possible organic compounds of the DF, only phenol congeners (up to 32.4 mg 1 ) and ichlorofluoroethane HCFC-141b (14.4 mg 1 ), a DF densifier, were found in the central channel, which is the last part of the core to freeze in the borehole. We conclude that the phenol compounds emerge due to physical processes, namely fractionation, during freezing, rather than any chemical reaction between the DF and the lake water. |
format |
Article in Journal/Newspaper |
author |
Alekhina, Irina Ekaykin, Alexey Moskvin, Alexey Lipenkov, Vladimir |
author_facet |
Alekhina, Irina Ekaykin, Alexey Moskvin, Alexey Lipenkov, Vladimir |
author_sort |
Alekhina, Irina |
title |
Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
title_short |
Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
title_full |
Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
title_fullStr |
Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
title_full_unstemmed |
Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok |
title_sort |
chemical characteristics of the ice cores obtained after the first unsealing of subglacial lake vostok |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3783641.v1 https://figshare.com/collections/Chemical_characteristics_of_the_ice_cores_obtained_after_the_first_unsealing_of_subglacial_Lake_Vostok/3783641/1 |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) |
geographic |
Antarctic Lake Vostok |
geographic_facet |
Antarctic Lake Vostok |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_relation |
https://dx.doi.org/10.1144/sp461.3 https://dx.doi.org/10.6084/m9.figshare.c.3783641 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3783641.v1 https://doi.org/10.1144/sp461.3 https://doi.org/10.6084/m9.figshare.c.3783641 |
_version_ |
1766190610221367296 |