Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316
Holocene paleoceanographic reconstructions along the North Iceland Shelf have employed a variety of sea surface temperature and sea ice proxies. However, these surface proxies tend to have a seasonal bias toward spring/summer and thus only provide a discrete snapshot of surface conditions during one...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.906098 2023-05-15T16:48:19+02:00 Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 Harning, David J Andrews, John T Belt, Simon T Cabedo-Sanz, Patricia Geirsdóttir, Áslaug Dildar, Nadia Miller, Gifford H Sepúlveda, Julio LATITUDE: 66.746000 * LONGITUDE: -18.790000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 2.275 m 2019-09-19 text/tab-separated-values, 490 data points https://doi.pangaea.de/10.1594/PANGAEA.906098 https://doi.org/10.1594/PANGAEA.906098 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.906098 https://doi.org/10.1594/PANGAEA.906098 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Harning, David J; Andrews, John T; Belt, Simon T; Cabedo-Sanz, Patricia; Geirsdóttir, Áslaug; Dildar, Nadia; Miller, Gifford H; Sepúlveda, Julio (2019): Sea Ice Control on Winter Subsurface Temperatures of the North Iceland Shelf During the Little Ice Age: A TEX86 Calibration Case Study. Paleoceanography and Paleoclimatology, 34(6), 1006-1021, https://doi.org/10.1029/2018PA003523 (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass Acyclic glycerol dialkyl glycerol tetraether Age B997-316 Crenarchaeol Crenarchaeol regio-isomer DEPTH sediment/rock Dicyclic glycerol dialkyl glycerol tetraether Diene II per unit sediment mass GGC Giant gravity corer Glycerol dialkyl glycerol tetraethers Monocyclic glycerol dialkyl glycerol tetraether North Icelandic Shelf Sample ID Temperature water winter Tetraether index of 86 carbon atoms low-temperature region Tricyclic glycerol dialkyl glycerol tetraether Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.906098 https://doi.org/10.1029/2018PA003523 2023-01-20T09:12:43Z Holocene paleoceanographic reconstructions along the North Iceland Shelf have employed a variety of sea surface temperature and sea ice proxies. However, these surface proxies tend to have a seasonal bias toward spring/summer and thus only provide a discrete snapshot of surface conditions during one season. Furthermore, sea surface temperature proxies can be influenced by additional confounding variables resulting in markedly different Holocene temperature reconstructions. Here, we expand Iceland's marine paleoclimate toolkit with TEX86 L: a temperature proxy based on the distribution of archaeal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids. We develop a local Icelandic calibration from 21 surface sediment samples covering a wide environmental gradient across Iceland's insular shelves. Locally calibrated GDGT results demonstrate that (1) TEX86 L reflects winter subsurface (0-200 m) temperatures on the North Iceland Shelf and (2) our calibration produces more realistic temperature estimates with substantially lower uncertainty (S.E. ±4 °C) over global calibrations. We then apply this new calibration to a high‐resolution marine sediment core (last millennium) collected from the central NIS with age control constrained by 14C‐dated mollusks. To test the veracity of the GDGT subsurface temperatures, we analyze quartz and calcite wt% and a series of highly branched isoprenoid alkenes, including the sea ice biomarker IP25, from the same core. The sediment records demonstrate that the development of thick sea ice during the Little Ice Age warmed the subsurface due to winter insulation. Importantly, this observation reflects a seasonal component of the sea ice/ocean feedback to be considered for the nonlinear cooling of the Little Ice Age in and around Iceland. Dataset Iceland Sea ice PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-18.790000,-18.790000,66.746000,66.746000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
(9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass Acyclic glycerol dialkyl glycerol tetraether Age B997-316 Crenarchaeol Crenarchaeol regio-isomer DEPTH sediment/rock Dicyclic glycerol dialkyl glycerol tetraether Diene II per unit sediment mass GGC Giant gravity corer Glycerol dialkyl glycerol tetraethers Monocyclic glycerol dialkyl glycerol tetraether North Icelandic Shelf Sample ID Temperature water winter Tetraether index of 86 carbon atoms low-temperature region Tricyclic glycerol dialkyl glycerol tetraether |
spellingShingle |
(9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass Acyclic glycerol dialkyl glycerol tetraether Age B997-316 Crenarchaeol Crenarchaeol regio-isomer DEPTH sediment/rock Dicyclic glycerol dialkyl glycerol tetraether Diene II per unit sediment mass GGC Giant gravity corer Glycerol dialkyl glycerol tetraethers Monocyclic glycerol dialkyl glycerol tetraether North Icelandic Shelf Sample ID Temperature water winter Tetraether index of 86 carbon atoms low-temperature region Tricyclic glycerol dialkyl glycerol tetraether Harning, David J Andrews, John T Belt, Simon T Cabedo-Sanz, Patricia Geirsdóttir, Áslaug Dildar, Nadia Miller, Gifford H Sepúlveda, Julio Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
topic_facet |
(9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass Acyclic glycerol dialkyl glycerol tetraether Age B997-316 Crenarchaeol Crenarchaeol regio-isomer DEPTH sediment/rock Dicyclic glycerol dialkyl glycerol tetraether Diene II per unit sediment mass GGC Giant gravity corer Glycerol dialkyl glycerol tetraethers Monocyclic glycerol dialkyl glycerol tetraether North Icelandic Shelf Sample ID Temperature water winter Tetraether index of 86 carbon atoms low-temperature region Tricyclic glycerol dialkyl glycerol tetraether |
description |
Holocene paleoceanographic reconstructions along the North Iceland Shelf have employed a variety of sea surface temperature and sea ice proxies. However, these surface proxies tend to have a seasonal bias toward spring/summer and thus only provide a discrete snapshot of surface conditions during one season. Furthermore, sea surface temperature proxies can be influenced by additional confounding variables resulting in markedly different Holocene temperature reconstructions. Here, we expand Iceland's marine paleoclimate toolkit with TEX86 L: a temperature proxy based on the distribution of archaeal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids. We develop a local Icelandic calibration from 21 surface sediment samples covering a wide environmental gradient across Iceland's insular shelves. Locally calibrated GDGT results demonstrate that (1) TEX86 L reflects winter subsurface (0-200 m) temperatures on the North Iceland Shelf and (2) our calibration produces more realistic temperature estimates with substantially lower uncertainty (S.E. ±4 °C) over global calibrations. We then apply this new calibration to a high‐resolution marine sediment core (last millennium) collected from the central NIS with age control constrained by 14C‐dated mollusks. To test the veracity of the GDGT subsurface temperatures, we analyze quartz and calcite wt% and a series of highly branched isoprenoid alkenes, including the sea ice biomarker IP25, from the same core. The sediment records demonstrate that the development of thick sea ice during the Little Ice Age warmed the subsurface due to winter insulation. Importantly, this observation reflects a seasonal component of the sea ice/ocean feedback to be considered for the nonlinear cooling of the Little Ice Age in and around Iceland. |
format |
Dataset |
author |
Harning, David J Andrews, John T Belt, Simon T Cabedo-Sanz, Patricia Geirsdóttir, Áslaug Dildar, Nadia Miller, Gifford H Sepúlveda, Julio |
author_facet |
Harning, David J Andrews, John T Belt, Simon T Cabedo-Sanz, Patricia Geirsdóttir, Áslaug Dildar, Nadia Miller, Gifford H Sepúlveda, Julio |
author_sort |
Harning, David J |
title |
Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
title_short |
Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
title_full |
Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
title_fullStr |
Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
title_full_unstemmed |
Biomarker and temperature and sea ice proxy data for TEX86 calibration in sediment core B997-316 |
title_sort |
biomarker and temperature and sea ice proxy data for tex86 calibration in sediment core b997-316 |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.906098 https://doi.org/10.1594/PANGAEA.906098 |
op_coverage |
LATITUDE: 66.746000 * LONGITUDE: -18.790000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 2.275 m |
long_lat |
ENVELOPE(-18.790000,-18.790000,66.746000,66.746000) |
genre |
Iceland Sea ice |
genre_facet |
Iceland Sea ice |
op_source |
Supplement to: Harning, David J; Andrews, John T; Belt, Simon T; Cabedo-Sanz, Patricia; Geirsdóttir, Áslaug; Dildar, Nadia; Miller, Gifford H; Sepúlveda, Julio (2019): Sea Ice Control on Winter Subsurface Temperatures of the North Iceland Shelf During the Little Ice Age: A TEX86 Calibration Case Study. Paleoceanography and Paleoclimatology, 34(6), 1006-1021, https://doi.org/10.1029/2018PA003523 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.906098 https://doi.org/10.1594/PANGAEA.906098 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.906098 https://doi.org/10.1029/2018PA003523 |
_version_ |
1766038421946499072 |