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Plant macrofossil evidence for an early onset of the Holocene summer thermal maximum in northernmost Europe.

Author:
  • M Väliranta
  • J S Salonen
  • M Heikkilä
  • L Amon
  • K Helmens
  • A Klimaschewski
  • P Kuhry
  • S Kultti
  • Anneli Poska
  • S Shala
  • S Veski
  • H H Birks
Publishing year: 2015
Language: English
Publication/Series: Nature Communications
Volume: 6
Document type: Journal article
Publisher: Nature Publishing Group

Abstract english

Holocene summer temperature reconstructions from northern Europe based on sedimentary pollen records suggest an onset of peak summer warmth around 9,000 years ago. However, pollen-based temperature reconstructions are largely driven by changes in the proportions of tree taxa, and thus the early-Holocene warming signal may be delayed due to the geographical disequilibrium between climate and tree populations. Here we show that quantitative summer-temperature estimates in northern Europe based on macrofossils of aquatic plants are in many cases ca. 2 °C warmer in the early Holocene (11,700-7,500 years ago) than reconstructions based on pollen data. When the lag in potential tree establishment becomes imperceptible in the mid-Holocene (7,500 years ago), the reconstructed temperatures converge at all study sites. We demonstrate that aquatic plant macrofossil records can provide additional and informative insights into early-Holocene temperature evolution in northernmost Europe and suggest further validation of early post-glacial climate development based on multi-proxy data syntheses.

Keywords

  • Physical Geography

Other

Published
  • ISSN: 2041-1723
E-mail: anneli [dot] poska [at] nateko [dot] lu [dot] se

Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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