| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
A robust, multisite Holocene history of drift ice off northern Iceland: implications for North Atlantic climate
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| Autores: |
Andrews, John T.
Darby, Dennis
Eberle, Dennis
Jennings, Anne E.
Moros, Matthias
Ogilvie, Astrid
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| Data: |
2009-02
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| Ano: |
2009
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| Palavras-chave: |
Ice rafted debris
Iceland
Quartz
Drift ice
Holocene
Arctic basin
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| Resumo: |
An important indicator of Holocene climate change is provided by evidence for variations in the extent of drift ice. A proxy for drift ice in Iceland waters is provided by the presence of quartz. Quantitative x-ray diffraction analysis of the < 2 mm sediment fraction was undertaken on 16 cores from around Iceland. The quartz weight (wt.)% estimates from each core were integrated into 250-yr intervals between -0.05 and 11.7 cal. ka BP. Median quartz wt.% varied between 0.2 and 3.4 and maximum values ranged between 2.8 and 11.8 wt.%. High values were attained in the early Holocene and minimum values were reached 6 7 cal. ka BP. Quartz wt.% then rose steadily during the late Holocene. Our data exhibit no correlation with counts on haematite-stained quartz (HSQ) grains from VM129-191 west of Ireland casting doubt on the ice-transport origin. A pilot study on the provenance of Fe oxide grains in two cores that cover the last 1.3 and 6.1 cal. ka BP indicated a large fraction of the grains between I and 6 cal. ka BP were from either Icelandic or presently unsampled sources. However, there was a dramatic increase in Canadian and Russian sources from the Arctic Ocean similar to 1 cal. ka BP. These data may indicate the beginning of an Arctic Oscillation-like climate mode.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00218/32943/31420.pdf
DOI:10.1177/0959683608098953
https://archimer.ifremer.fr/doc/00218/32943/
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| Editor: |
Sage Publications Ltd
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| Formato: |
application/pdf
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| Fonte: |
Holocene (0959-6836) (Sage Publications Ltd), 2009-02 , Vol. 19 , N. 1 , P. 71-77
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| Direitos: |
2009 SAGE Publications
info:eu-repo/semantics/openAccess
restricted use
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