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THE USE OF CHIRONOMIDS IN RECONSTRUCTING HOLOCENE PALAEOCLIMATE IN NORTHWEST ICELAND

HOLMES, NAOMI  University of Exeter.

Little quantitative palaeoclimatic data exists for Iceland and, as yet there are no terrestrially derived full Holocene palaeoclimatic reconstructions for Iceland. The work presented on this poster is part of a wider project on Holocene climatic change in Iceland (Caseldine and Langdon, this conference), and is an initial attempt to develop the use of subfossil chironomids to produce precise and accurate palaeoclimatic (especially temperature) reconstructions for Northwest Iceland. A number of lakes from Northwest Iceland, both on the Snaefellsnes Peninsula and on the Northwest Peninsula, have been sampled, and data is presented from selected sites. The main aims of this work are to calibrate the chironomid signal against recent climatic change; to test the transfer function currently being developed (Langdon, this conference); and to evaluate the effects of within lake variability of subfossil chironomids on palaeoclimatic reconstructions.

Preliminary results suggest that while the effects of within lake variability of chironomids on predicted temperatures are not statistically significant, the level of the variation (c.1.5C) between samples in one lake could prove problematic considering the relatively small magnitude of temperature changes experienced over the Holocene.


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