Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene
Glycerol dialkyl glycerol tetraethers (GDGTs) have become a useful tool in paleoclimate research in ocean environments, but their applications in the Arctic are yet to be developed. GDGTs were analyzed in three sediment cores from the northern/northeastern margin of the Chukchi Sea to test the appli...
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ftcopernicus:oai:publications.copernicus.org:bgd56262 2023-05-15T14:57:45+02:00 Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene Park, Yu-Hyeon Yamamoto, Masanobu Polyak, Leonid Nam, Seung-Il 2018-09-26 application/pdf https://doi.org/10.5194/bg-2016-529 https://www.biogeosciences-discuss.net/bg-2016-529/ eng eng doi:10.5194/bg-2016-529 https://www.biogeosciences-discuss.net/bg-2016-529/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-2016-529 2019-12-24T09:51:46Z Glycerol dialkyl glycerol tetraethers (GDGTs) have become a useful tool in paleoclimate research in ocean environments, but their applications in the Arctic are yet to be developed. GDGTs were analyzed in three sediment cores from the northern/northeastern margin of the Chukchi Sea to test the applicability of GDGT proxies for reconstructing sea surface temperature and sea-ice variability in the Holocene. Interpretation was enabled by an earlier investigation of GDGT composition in surface sediments from the study area. Low GDGT concentrations and high BIT and CBT values in core sediments older than ca. 8 ka probably indicate heavy sea-ice conditions in combination with terrestrial inputs during deglaciation and incomplete sea-level rise. Higher concentrations of isoprenoid GDGTs after ca. 8 ka, consistent with an increase in total organic carbon and some other biogenic proxies, are interpreted to represent increased primary production combined with elevated sedimentation rates. These patterns were likely controlled by sea-ice conditions and variations in Pacific water inflow. Geographic heterogeneity in these processes is indicated by differences in GDGTs distribution patterns between cores across the Chukchi margin. TEX 86 and TEX 86 L indices potentially indicative of sea surface temperatures appear to show millennial-scale variability, but the controls on these fluctuations are yet to be understood. Text Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Chukchi Sea Pacific |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Glycerol dialkyl glycerol tetraethers (GDGTs) have become a useful tool in paleoclimate research in ocean environments, but their applications in the Arctic are yet to be developed. GDGTs were analyzed in three sediment cores from the northern/northeastern margin of the Chukchi Sea to test the applicability of GDGT proxies for reconstructing sea surface temperature and sea-ice variability in the Holocene. Interpretation was enabled by an earlier investigation of GDGT composition in surface sediments from the study area. Low GDGT concentrations and high BIT and CBT values in core sediments older than ca. 8 ka probably indicate heavy sea-ice conditions in combination with terrestrial inputs during deglaciation and incomplete sea-level rise. Higher concentrations of isoprenoid GDGTs after ca. 8 ka, consistent with an increase in total organic carbon and some other biogenic proxies, are interpreted to represent increased primary production combined with elevated sedimentation rates. These patterns were likely controlled by sea-ice conditions and variations in Pacific water inflow. Geographic heterogeneity in these processes is indicated by differences in GDGTs distribution patterns between cores across the Chukchi margin. TEX 86 and TEX 86 L indices potentially indicative of sea surface temperatures appear to show millennial-scale variability, but the controls on these fluctuations are yet to be understood. |
format |
Text |
author |
Park, Yu-Hyeon Yamamoto, Masanobu Polyak, Leonid Nam, Seung-Il |
spellingShingle |
Park, Yu-Hyeon Yamamoto, Masanobu Polyak, Leonid Nam, Seung-Il Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
author_facet |
Park, Yu-Hyeon Yamamoto, Masanobu Polyak, Leonid Nam, Seung-Il |
author_sort |
Park, Yu-Hyeon |
title |
Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
title_short |
Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
title_full |
Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
title_fullStr |
Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
title_full_unstemmed |
Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene |
title_sort |
glycerol dialkyl glycerol tetraether variations in the northern chukchi sea, arctic ocean, during the holocene |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-2016-529 https://www.biogeosciences-discuss.net/bg-2016-529/ |
geographic |
Arctic Arctic Ocean Chukchi Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Pacific |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2016-529 https://www.biogeosciences-discuss.net/bg-2016-529/ |
op_doi |
https://doi.org/10.5194/bg-2016-529 |
_version_ |
1766329871846342656 |