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.
Source Holocene (0959-6836) (Sage Publications Ltd), 2009-02 , Vol. 19 , N. 1 , P. 71-77
DOI 10.1177/0959683608098953
WOS© Times Cited 49
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.
Full Text
File Pages Size Access
Publisher's official version 7 579 KB Open access
Top of the page