Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records
Diatom analyses have been performed on a 425cm long Holocene marine sediment sequence from the North Atlantic south of Iceland and a 920cm sediment core spanning the last c. 7500 years from Skalafjord, Faeroe Islands. Additional core data include stable isotopes and results from magnetic susceptibil...
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Online Access: | http://dx.doi.org/10.1191/0959683605hl768rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl768rp |
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crsagepubl:10.1191/0959683605hl768rp 2024-06-23T07:54:03+00:00 Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records Witak, Malgorzata Wachnicka, Anna Kuijpers, Antoon Troelstra, Simon Prins, Maarten A. Witkowski, Andrzej 2005 http://dx.doi.org/10.1191/0959683605hl768rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl768rp en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 15, issue 1, page 85-96 ISSN 0959-6836 1477-0911 journal-article 2005 crsagepubl https://doi.org/10.1191/0959683605hl768rp 2024-06-11T04:30:53Z Diatom analyses have been performed on a 425cm long Holocene marine sediment sequence from the North Atlantic south of Iceland and a 920cm sediment core spanning the last c. 7500 years from Skalafjord, Faeroe Islands. Additional core data include stable isotopes and results from magnetic susceptibility measurements, while chronostratigraphic control has been provided by AMS 14C measurements. The diatom records reveal distinct changes in North Atlantic surface circulation and climate that have been correlated with published terrestrial and marine records. Initial Holocene warming is dated at 9900 14C years BP, and after a Preboreal cold spell enhanced North Atlantic Current activity and warming prevailed from 9600 to 8800 14C years BP. From 8800 to 8000 "4C years BP the advection of warm Atlantic water masses weakened, presumably under atmospheric circulation conditions characterized by a dominating negative NAO. Prior to the Holocene Climatic Optimum (6000-5000 14C years BP) distinct hydrographic gradients existed in the northern North Atlantic that were probably most pronounced during the reported '8200 cal. years BP cold event'. After 5000 "4C years BP both core records indicate increased climate instability and periods of cooling ('Neoglaciation'), with enhanced cyclone activity affecting the northern North Atlantic particularly at around 4700, 4200, 3200, 2000, 1500 and 1000 14C years BP. Article in Journal/Newspaper Iceland north atlantic current North Atlantic SAGE Publications The Holocene 15 1 85 96 |
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English |
description |
Diatom analyses have been performed on a 425cm long Holocene marine sediment sequence from the North Atlantic south of Iceland and a 920cm sediment core spanning the last c. 7500 years from Skalafjord, Faeroe Islands. Additional core data include stable isotopes and results from magnetic susceptibility measurements, while chronostratigraphic control has been provided by AMS 14C measurements. The diatom records reveal distinct changes in North Atlantic surface circulation and climate that have been correlated with published terrestrial and marine records. Initial Holocene warming is dated at 9900 14C years BP, and after a Preboreal cold spell enhanced North Atlantic Current activity and warming prevailed from 9600 to 8800 14C years BP. From 8800 to 8000 "4C years BP the advection of warm Atlantic water masses weakened, presumably under atmospheric circulation conditions characterized by a dominating negative NAO. Prior to the Holocene Climatic Optimum (6000-5000 14C years BP) distinct hydrographic gradients existed in the northern North Atlantic that were probably most pronounced during the reported '8200 cal. years BP cold event'. After 5000 "4C years BP both core records indicate increased climate instability and periods of cooling ('Neoglaciation'), with enhanced cyclone activity affecting the northern North Atlantic particularly at around 4700, 4200, 3200, 2000, 1500 and 1000 14C years BP. |
format |
Article in Journal/Newspaper |
author |
Witak, Malgorzata Wachnicka, Anna Kuijpers, Antoon Troelstra, Simon Prins, Maarten A. Witkowski, Andrzej |
spellingShingle |
Witak, Malgorzata Wachnicka, Anna Kuijpers, Antoon Troelstra, Simon Prins, Maarten A. Witkowski, Andrzej Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
author_facet |
Witak, Malgorzata Wachnicka, Anna Kuijpers, Antoon Troelstra, Simon Prins, Maarten A. Witkowski, Andrzej |
author_sort |
Witak, Malgorzata |
title |
Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
title_short |
Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
title_full |
Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
title_fullStr |
Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
title_full_unstemmed |
Holocene North Atlantic surface circulation and climatic variability: evidence from diatom records |
title_sort |
holocene north atlantic surface circulation and climatic variability: evidence from diatom records |
publisher |
SAGE Publications |
publishDate |
2005 |
url |
http://dx.doi.org/10.1191/0959683605hl768rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl768rp |
genre |
Iceland north atlantic current North Atlantic |
genre_facet |
Iceland north atlantic current North Atlantic |
op_source |
The Holocene volume 15, issue 1, page 85-96 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683605hl768rp |
container_title |
The Holocene |
container_volume |
15 |
container_issue |
1 |
container_start_page |
85 |
op_container_end_page |
96 |
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1802645989553602560 |