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

Väliranta, M; Salonen, J S; Heikkilä, M; Amon, L; Helmens, K; Klimaschewski, A; Kuhry, P; Kultti, S; Poska, Anneli LU and Shala, S, et al. (2015) In Nature Communications 6.
Abstract
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... (More)
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. (Less)
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Nature Communications
volume
6
publisher
Nature Publishing Group
external identifiers
  • pmid:25858780
  • wos:000353702500049
  • scopus:84927588905
ISSN
2041-1723
DOI
10.1038/ncomms7809
language
English
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yes
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10bb195a-4d30-4f0e-a6ae-198c79e6f95e (old id 5345020)
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2015-06-25 09:33:42
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@article{10bb195a-4d30-4f0e-a6ae-198c79e6f95e,
  abstract     = {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.},
  articleno    = {6809},
  author       = {Väliranta, M and Salonen, J S and Heikkilä, M and Amon, L and Helmens, K and Klimaschewski, A and Kuhry, P and Kultti, S and Poska, Anneli and Shala, S and Veski, S and Birks, H H},
  issn         = {2041-1723},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Plant macrofossil evidence for an early onset of the Holocene summer thermal maximum in northernmost Europe.},
  url          = {http://dx.doi.org/10.1038/ncomms7809},
  volume       = {6},
  year         = {2015},
}