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Spatial structure of the 8200 cal yr BP event in northern Europe

Seppa, H.; Birks, H. J. B.; Giesecke, T.; Hammarlund, Dan LU ; Alenius, T.; Antonsson, K.; Bjune, A. E.; Heikkila, M.; MacDonald, G. M. and Ojala, A. E. K., et al. (2007) In Climate of the Past 3(2). p.225-236
Abstract
A synthesis of well-dated high-resolution pollen records suggests a spatial structure in the 8200 cal yr BP event in northern Europe. The temperate, thermophilous tree taxa, especially Corylus, Ulmus, and Alnus, decline abruptly between 8300 and 8000 cal yr BP at most sites located south of 61 degrees N, whereas there is no clear change in pollen values at the sites located in the North-European tree-line region. Pollen-based quantitative temperature reconstructions and several other, independent palaeoclimate proxies, such as lacustrine oxygen-isotope records, reflect the same pattern, with no detectable cooling in the sub-arctic region. The observed patterns challenges the general view of the widespread occurrence of the 8200 cal yr BP... (More)
A synthesis of well-dated high-resolution pollen records suggests a spatial structure in the 8200 cal yr BP event in northern Europe. The temperate, thermophilous tree taxa, especially Corylus, Ulmus, and Alnus, decline abruptly between 8300 and 8000 cal yr BP at most sites located south of 61 degrees N, whereas there is no clear change in pollen values at the sites located in the North-European tree-line region. Pollen-based quantitative temperature reconstructions and several other, independent palaeoclimate proxies, such as lacustrine oxygen-isotope records, reflect the same pattern, with no detectable cooling in the sub-arctic region. The observed patterns challenges the general view of the widespread occurrence of the 8200 cal yr BP event in the North Atlantic region. An alternative explanation is that the cooling during the 8200 cal yr BP event took place mostly during the winter and spring, and the ecosystems in the south responded sensitively to the cooling during the onset of the growing season. In contrast, in the sub-arctic area, where the vegetation was still dormant and lakes ice-covered, the cold event is not reflected in pollen-based or lake-sediment-based records. (Less)
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Climate of the Past
volume
3
issue
2
pages
225 - 236
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Copernicus Gesellschaft Mbh
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  • wos:000247031400004
  • scopus:34249095370
ISSN
1814-9332
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English
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yes
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88c89e9b-0f17-447e-afc4-941b44facb07 (old id 651128)
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2008-01-02 15:13:56
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@article{88c89e9b-0f17-447e-afc4-941b44facb07,
  abstract     = {A synthesis of well-dated high-resolution pollen records suggests a spatial structure in the 8200 cal yr BP event in northern Europe. The temperate, thermophilous tree taxa, especially Corylus, Ulmus, and Alnus, decline abruptly between 8300 and 8000 cal yr BP at most sites located south of 61 degrees N, whereas there is no clear change in pollen values at the sites located in the North-European tree-line region. Pollen-based quantitative temperature reconstructions and several other, independent palaeoclimate proxies, such as lacustrine oxygen-isotope records, reflect the same pattern, with no detectable cooling in the sub-arctic region. The observed patterns challenges the general view of the widespread occurrence of the 8200 cal yr BP event in the North Atlantic region. An alternative explanation is that the cooling during the 8200 cal yr BP event took place mostly during the winter and spring, and the ecosystems in the south responded sensitively to the cooling during the onset of the growing season. In contrast, in the sub-arctic area, where the vegetation was still dormant and lakes ice-covered, the cold event is not reflected in pollen-based or lake-sediment-based records.},
  author       = {Seppa, H. and Birks, H. J. B. and Giesecke, T. and Hammarlund, Dan and Alenius, T. and Antonsson, K. and Bjune, A. E. and Heikkila, M. and MacDonald, G. M. and Ojala, A. E. K. and Telford, R. J. and Veski, S.},
  issn         = {1814-9332},
  language     = {eng},
  number       = {2},
  pages        = {225--236},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Climate of the Past},
  title        = {Spatial structure of the 8200 cal yr BP event in northern Europe},
  volume       = {3},
  year         = {2007},
}