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...
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Online Access: | https://oceanrep.geomar.de/id/eprint/32037/ https://oceanrep.geomar.de/id/eprint/32037/1/Andersen.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 |
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ftoceanrep:oai:oceanrep.geomar.de:32037 2023-05-15T15:10:06+02:00 A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms Andersen, Christine Koç, N. Moros, M. 2004 text https://oceanrep.geomar.de/id/eprint/32037/ https://oceanrep.geomar.de/id/eprint/32037/1/Andersen.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/32037/1/Andersen.pdf Andersen, C., Koç, N. and Moros, M. (2004) A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms. Quaternary Science Reviews, 23 (20-22). pp. 2155-2166. DOI 10.1016/j.quascirev.2004.08.004 <https://doi.org/10.1016/j.quascirev.2004.08.004>. doi:10.1016/j.quascirev.2004.08.004 Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1016/j.quascirev.2004.08.004 2023-04-07T15:24:50Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Quaternary Science Reviews 23 20-22 2155 2166 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
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, Christine Koç, N. Moros, M. |
spellingShingle |
Andersen, Christine Koç, N. Moros, M. A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms |
author_facet |
Andersen, Christine Koç, N. Moros, M. |
author_sort |
Andersen, Christine |
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 |
Elsevier |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/32037/ https://oceanrep.geomar.de/id/eprint/32037/1/Andersen.pdf https://doi.org/10.1016/j.quascirev.2004.08.004 |
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_relation |
https://oceanrep.geomar.de/id/eprint/32037/1/Andersen.pdf Andersen, C., Koç, N. and Moros, M. (2004) A highly unstable Holocene climate in the subpolar North Atlantic: evidence from diatoms. Quaternary Science Reviews, 23 (20-22). pp. 2155-2166. DOI 10.1016/j.quascirev.2004.08.004 <https://doi.org/10.1016/j.quascirev.2004.08.004>. doi:10.1016/j.quascirev.2004.08.004 |
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 |
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1766341159406272512 |