Journal
QUATERNARY SCIENCE REVIEWS
Volume 28, Issue 9-10, Pages 799-811Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2008.12.001
Keywords
-
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Science Foundation-Earth System History
Ask authors/readers for more resources
Fossil Chironomidae assemblages (with a few Chaoboridae and Ceratopogonidae) from Zagoskin and Burial Lakes in western Alaska provide quantitative reconstructions of mean July air temperatures for periods of the late-middle Wisconsin (similar to 39,000-34,000 cal yr B.P.) to the present. Inferred temperatures are compared with previously analyzed pollen data from each site summarized here by indirect ordination. Paleotemperature trends reveal substantial differences in the timing of climatic warming following the late Wisconsin at each site, although chronological uncertainty exists. Zagoskin Lake shows early warming beginning at about 21,000 cal yr B.P., whereas warming at Burial Lake begins similar to 4000 years later. Summer climates during the last glacial maximum (LGM) were on average similar to 3.5 degrees C below the modern temperatures at each site. Major shifts in vegetation occurred from similar to 19,000 to 10,000 cal yr B.P. at Zagoskin Lake and from similar to 17,000 to 10,000 cal yr B.R at Burial Lake. Vegetation shifts followed climatic warming, when temperatures neared modern values. Both sites provide evidence of an early postglacial thermal maximum at similar to 12,300 cal yr B.R These chironomid records, combined with other insect-based climatic reconstructions from Beringia, indicate that during the LGM: (1) greater continentality likely influenced regions adjacent to the Bering Land Bridge and (2) summer climates were, at times, not dominated by severe cold. (C) 2008 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available