Age determination of sediments of Site LO09-14 (Table 1)
A composite record (LO09-14) of three sediment cores from the subpolar North Atlantic (Reykjanes Ridge) was investigated in order to assess surface ocean variability during the last 11 kyr. The core site is today partly under the influence of the Irminger Current (IC), a branch of the North Atlantic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.742950 2023-05-15T15:17:29+02:00 Age determination of sediments of Site LO09-14 (Table 1) Andersen, Catherine Koç, Nalân Moros, Matthias MEDIAN LATITUDE: 58.938444 * MEDIAN LONGITUDE: -30.408889 * SOUTH-BOUND LATITUDE: 58.938000 * WEST-BOUND LONGITUDE: -30.409167 * NORTH-BOUND LATITUDE: 58.938667 * EAST-BOUND LONGITUDE: -30.408667 * DATE/TIME START: 1993-09-08T00:00:00 * DATE/TIME END: 1993-09-08T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.000 m * MAXIMUM DEPTH, sediment/rock: 4.470 m 2004-07-08 text/tab-separated-values, 145 data points https://doi.pangaea.de/10.1594/PANGAEA.742950 https://doi.org/10.1594/PANGAEA.742950 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.742950 https://doi.org/10.1594/PANGAEA.742950 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Andersen, Catherine; Koç, Nalân; Moros, Matthias (2004): A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms. Quaternary Science Reviews, 23(20-22), 2155-2166, https://doi.org/10.1016/j.quascirev.2004.08.004 Age 14C AMS 14C calibrated dated dated standard deviation Calendar age DEPTH sediment/rock Event label Giant box corer GKG Gravity corer (Kiel type) KAL Kasten corer LO09 LO09/14-1 LO09/14-2 LO09/14-3 Professor Logachev Sample code/label SL Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.742950 https://doi.org/10.1016/j.quascirev.2004.08.004 2023-01-20T08:51:18Z A composite record (LO09-14) of three sediment cores from the subpolar North Atlantic (Reykjanes Ridge) was investigated in order to assess surface ocean variability during the last 11 kyr. The core site is today partly under the influence of the Irminger Current (IC), a branch of the North Atlantic Drift continuing northwestward around Iceland. However, it is also proximal to the Sub-Arctic Front (SAF) that may cause extra dynamic hydrographic conditions. We used statistical methods applied to the fossil assemblages of diatoms to reconstruct quantitative sea surface temperatures (SSTs). Our investigations give evidence for different regional signatures of Holocene surface oceanographic changes in the North Atlantic. Core LO09-14 reveal relatively low and highly variable SSTs during the early Holocene, indicating a weak IC and increased advection of subpolar water over the site. A mid-Holocene thermal optimum with a strong IC occurs from 7.5 to 5 kyr and is followed by cooler and more stable late Holocene surface conditions. Several intervals throughout the Holocene are dominated by the diatom species Rhizosolenia borealis, which we suggest indicates proximity to a strongly defined convergence front, most likely the SAF. Several coolings, reflecting southeastward advection of cold and ice-bearing waters, occur at 10.4, 9.8, 8.3, 7.9, 6.4, 4.7, 4.3 and 2.8 kyr. The cooling events recorded in the LO09-14 SSTs correlate well with both other surface records from the area and the NADW reductions observed at ODP Site 980 indicating a surface-deepwater linkage through the Holocene. Dataset Arctic Iceland NADW North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Arctic Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-30.409167,-30.408667,58.938667,58.938000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C calibrated dated dated standard deviation Calendar age DEPTH sediment/rock Event label Giant box corer GKG Gravity corer (Kiel type) KAL Kasten corer LO09 LO09/14-1 LO09/14-2 LO09/14-3 Professor Logachev Sample code/label SL |
spellingShingle |
Age 14C AMS 14C calibrated dated dated standard deviation Calendar age DEPTH sediment/rock Event label Giant box corer GKG Gravity corer (Kiel type) KAL Kasten corer LO09 LO09/14-1 LO09/14-2 LO09/14-3 Professor Logachev Sample code/label SL Andersen, Catherine Koç, Nalân Moros, Matthias Age determination of sediments of Site LO09-14 (Table 1) |
topic_facet |
Age 14C AMS 14C calibrated dated dated standard deviation Calendar age DEPTH sediment/rock Event label Giant box corer GKG Gravity corer (Kiel type) KAL Kasten corer LO09 LO09/14-1 LO09/14-2 LO09/14-3 Professor Logachev Sample code/label SL |
description |
A composite record (LO09-14) of three sediment cores from the subpolar North Atlantic (Reykjanes Ridge) was investigated in order to assess surface ocean variability during the last 11 kyr. The core site is today partly under the influence of the Irminger Current (IC), a branch of the North Atlantic Drift continuing northwestward around Iceland. However, it is also proximal to the Sub-Arctic Front (SAF) that may cause extra dynamic hydrographic conditions. We used statistical methods applied to the fossil assemblages of diatoms to reconstruct quantitative sea surface temperatures (SSTs). Our investigations give evidence for different regional signatures of Holocene surface oceanographic changes in the North Atlantic. Core LO09-14 reveal relatively low and highly variable SSTs during the early Holocene, indicating a weak IC and increased advection of subpolar water over the site. A mid-Holocene thermal optimum with a strong IC occurs from 7.5 to 5 kyr and is followed by cooler and more stable late Holocene surface conditions. Several intervals throughout the Holocene are dominated by the diatom species Rhizosolenia borealis, which we suggest indicates proximity to a strongly defined convergence front, most likely the SAF. Several coolings, reflecting southeastward advection of cold and ice-bearing waters, occur at 10.4, 9.8, 8.3, 7.9, 6.4, 4.7, 4.3 and 2.8 kyr. The cooling events recorded in the LO09-14 SSTs correlate well with both other surface records from the area and the NADW reductions observed at ODP Site 980 indicating a surface-deepwater linkage through the Holocene. |
format |
Dataset |
author |
Andersen, Catherine Koç, Nalân Moros, Matthias |
author_facet |
Andersen, Catherine Koç, Nalân Moros, Matthias |
author_sort |
Andersen, Catherine |
title |
Age determination of sediments of Site LO09-14 (Table 1) |
title_short |
Age determination of sediments of Site LO09-14 (Table 1) |
title_full |
Age determination of sediments of Site LO09-14 (Table 1) |
title_fullStr |
Age determination of sediments of Site LO09-14 (Table 1) |
title_full_unstemmed |
Age determination of sediments of Site LO09-14 (Table 1) |
title_sort |
age determination of sediments of site lo09-14 (table 1) |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.742950 https://doi.org/10.1594/PANGAEA.742950 |
op_coverage |
MEDIAN LATITUDE: 58.938444 * MEDIAN LONGITUDE: -30.408889 * SOUTH-BOUND LATITUDE: 58.938000 * WEST-BOUND LONGITUDE: -30.409167 * NORTH-BOUND LATITUDE: 58.938667 * EAST-BOUND LONGITUDE: -30.408667 * DATE/TIME START: 1993-09-08T00:00:00 * DATE/TIME END: 1993-09-08T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.000 m * MAXIMUM DEPTH, sediment/rock: 4.470 m |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-30.409167,-30.408667,58.938667,58.938000) |
geographic |
Arctic Reykjanes |
geographic_facet |
Arctic Reykjanes |
genre |
Arctic Iceland NADW North Atlantic |
genre_facet |
Arctic Iceland NADW North Atlantic |
op_source |
Supplement to: Andersen, Catherine; Koç, Nalân; Moros, Matthias (2004): A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms. Quaternary Science Reviews, 23(20-22), 2155-2166, https://doi.org/10.1016/j.quascirev.2004.08.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.742950 https://doi.org/10.1594/PANGAEA.742950 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.742950 https://doi.org/10.1016/j.quascirev.2004.08.004 |
_version_ |
1766347722934190080 |