A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms
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...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Pergamon-elsevier Science Ltd
2004
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00229/34003/32348.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 https://archimer.ifremer.fr/doc/00229/34003/ |
id |
ftarchimer:oai:archimer.ifremer.fr:34003 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:34003 2023-05-15T15:09:47+02:00 A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms Andersen, C Koc, N Moros, M 2004-11 application/pdf https://archimer.ifremer.fr/doc/00229/34003/32348.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 https://archimer.ifremer.fr/doc/00229/34003/ eng eng Pergamon-elsevier Science Ltd https://archimer.ifremer.fr/doc/00229/34003/32348.pdf doi:10.1016/j.quascirev.2004.08.004 https://archimer.ifremer.fr/doc/00229/34003/ 2004 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2004-11 , Vol. 23 , N. 20-22 , P. 2155-2166 text Publication info:eu-repo/semantics/article 2004 ftarchimer https://doi.org/10.1016/j.quascirev.2004.08.004 2021-09-23T20:25:14Z 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. Article in Journal/Newspaper Arctic Iceland NADW North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Quaternary Science Reviews 23 20-22 2155 2166 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
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 |
Article in Journal/Newspaper |
author |
Andersen, C Koc, N Moros, M |
spellingShingle |
Andersen, C Koc, N Moros, M A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
author_facet |
Andersen, C Koc, N Moros, M |
author_sort |
Andersen, C |
title |
A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
title_short |
A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
title_full |
A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
title_fullStr |
A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
title_full_unstemmed |
A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
title_sort |
highly unstable holocene climate in the subpolar north atlantic: evidence from diatoms |
publisher |
Pergamon-elsevier Science Ltd |
publishDate |
2004 |
url |
https://archimer.ifremer.fr/doc/00229/34003/32348.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 https://archimer.ifremer.fr/doc/00229/34003/ |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Arctic Reykjanes |
geographic_facet |
Arctic Reykjanes |
genre |
Arctic Iceland NADW North Atlantic |
genre_facet |
Arctic Iceland NADW North Atlantic |
op_source |
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2004-11 , Vol. 23 , N. 20-22 , P. 2155-2166 |
op_relation |
https://archimer.ifremer.fr/doc/00229/34003/32348.pdf doi:10.1016/j.quascirev.2004.08.004 https://archimer.ifremer.fr/doc/00229/34003/ |
op_rights |
2004 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quascirev.2004.08.004 |
container_title |
Quaternary Science Reviews |
container_volume |
23 |
container_issue |
20-22 |
container_start_page |
2155 |
op_container_end_page |
2166 |
_version_ |
1766340898541535232 |