A robust, multisite Holocene history of drift ice off northern Iceland: implications for North Atlantic climate
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2009-02 | ||||||||
| Language | English | ||||||||
| Author(s) | Andrews John T.1, 2, Darby Dennis3, Eberle Dennis4, Jennings Anne E.1, 2, Moros Matthias5, 6, Ogilvie Astrid1, 7 | ||||||||
| Affiliation(s) | 1 : INSTAAR, Boulder, CO 80303 USA. 2 : Univ Colorado, Dept Geol Sci, Boulder, CO 80303 USA. 3 : Old Dominion Univ, Dept Ocean Earth & Atmospher Sci, Norfolk, VA 23529 USA. 4 : US Geol Survey, Boulder, CO 80303 USA. 5 : Bjerknes Ctr Climate Res, N-5007 Bergen, Norway. 6 : Balt Sea Res Inst, D-18119 Rostock, Germany. 7 : Univ Colorado, Dept Anthropol, Boulder, CO 80303 USA. |
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| Source | Holocene (0959-6836) (Sage Publications Ltd), 2009-02 , Vol. 19 , N. 1 , P. 71-77 | ||||||||
| DOI | 10.1177/0959683608098953 | ||||||||
| WOS© Times Cited | 55 | ||||||||
| Keyword(s) | Ice rafted debris, Iceland, quartz, drift ice, Holocene, Arctic basin | ||||||||
| Abstract | 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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