The University of Southampton
University of Southampton Institutional Repository

Late Quaternary palaeoclimate of western Alaska inferred from fossil chironomids and its relation to vegetation histories

Kurek, Joshua, Cwynar, Les C., Ager, Thomas A., Abbott, Mark B. and Edwards, Mary E. (2009) Late Quaternary palaeoclimate of western Alaska inferred from fossil chironomids and its relation to vegetation histories Quaternary Science Reviews, 28, (9-10), pp. 799-811. (doi:10.1016/j.quascirev.2008.12.001).

Record type: Article

Abstract

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

PDF kurek_et_al_2009_qsr.pdf - Version of Record
Restricted to Repository staff only
Download (855kB)

More information

Published date: May 2009

Identifiers

Local EPrints ID: 68989
URI: http://eprints.soton.ac.uk/id/eprint/68989
ISSN: 0277-3791
PURE UUID: 5f52710c-cb34-455a-9790-b11ccbd6cb32
ORCID for Mary E. Edwards: ORCID iD orcid.org/0000-0002-3490-6682

Catalogue record

Date deposited: 13 Oct 2009
Last modified: 19 Jul 2017 00:14

Export record

Altmetrics

Contributors

Author: Joshua Kurek
Author: Les C. Cwynar
Author: Thomas A. Ager
Author: Mark B. Abbott
Author: Mary E. Edwards ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×