Data/hora: 04/06/2024 03:39:39

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | A robust, multisite Holocene history of drift ice off northern Iceland: implications for North Atlantic climate
Autores: | Andrews, John T.; Darby, Dennis; Eberle, Dennis; Jennings, Anne E.; Moros, Matthias; Ogilvie, Astrid.
Data: | 2009-02
Ano: | 2009
Palavras-chave: | Ice rafted debris; Iceland; Quartz; Drift ice; Holocene; Arctic basin.
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 &lt; 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00218/32943/31420.pdf

DOI:10.1177/0959683608098953

https://archimer.ifremer.fr/doc/00218/32943/

Editor: | Sage Publications Ltd
Formato: | application/pdf
Fonte: | Holocene (0959-6836) (Sage Publications Ltd), 2009-02 , Vol. 19 , N. 1 , P. 71-77

Fonte:

2009 SAGE Publications

info:eu-repo/semantics/openAccess

restricted use