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Environmental and climate reconstruction of the late-glacial-Holocene transition from a lake sediment sequence in Aubrac, French Massif Central : Chironomid and diatom evidence

Gandouin, E.; Rioual, P.; Pailles, C.; Brooks, S. J.; Ponel, P.; Guiter, F.; Djamali, M.; Andrieu-Ponel, V.; Birks, H. J B and Leydet, M., et al. (2016) In Palaeogeography, Palaeoclimatology, Palaeoecology 461. p.292-309
Abstract

The analysis of fossil chironomid and diatom assemblages from a sedimentary record from Les Roustières peat bog (Massif Central, France, 1196 m asl) allows the reconstruction of past environmental and climate changes during the late-glacial and early Holocene. Chironomid assemblages showed that the infilling of the palaeolake had commenced during the Oldest Dryas (GS-2b) as suggested by the rapid decrease in chironomid species associated with the cold and deep zone of lakes and by their replacement by littoral and eutrophic taxa. Quantitative July temperature reconstructions, based on the chironomid data, suggest that mean July air temperature (Tjul) ranged between 6 °C and 11 °C at the termination of the Oldest Dryas period (GS-2b).... (More)

The analysis of fossil chironomid and diatom assemblages from a sedimentary record from Les Roustières peat bog (Massif Central, France, 1196 m asl) allows the reconstruction of past environmental and climate changes during the late-glacial and early Holocene. Chironomid assemblages showed that the infilling of the palaeolake had commenced during the Oldest Dryas (GS-2b) as suggested by the rapid decrease in chironomid species associated with the cold and deep zone of lakes and by their replacement by littoral and eutrophic taxa. Quantitative July temperature reconstructions, based on the chironomid data, suggest that mean July air temperature (Tjul) ranged between 6 °C and 11 °C at the termination of the Oldest Dryas period (GS-2b). Climate began to warm at the start of the Bølling period (GI-1e), between 15,000 and 14,800 cal yr BP, with a rise in Tjul of about 4 °C. This climate warming is contemporaneous with lake eutrophication as suggested by diatoms and chironomids. Maximum temperatures of 13–14 °C were reached around 13,600 cal yr BP during the Allerød period (GI-1c–GI-1a). The Younger Dryas period (GS-1) is marked by a return to cold conditions with Tjul of about 10 °C during a first phase, then 13 °C in its terminal part. A probable increase in the duration of the ice-cover may have favoured arctic and alpine diatom species. The early-Holocene climate improvement is marked by a rise in Tjul of about 3 °C.

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keywords
Corynocera ambigua, Palaeolimnology, Past aquatic ecosystem, Subfossil insects, Temperature reconstruction, Western Europe
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
461
pages
18 pages
publisher
Elsevier
external identifiers
  • scopus:84989830861
  • wos:000385599900024
ISSN
0031-0182
DOI
10.1016/j.palaeo.2016.08.039
language
English
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yes
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09f2f35b-2ff7-4840-a0d6-8585c560e109
date added to LUP
2016-10-20 14:18:59
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2017-03-10 13:20:43
@article{09f2f35b-2ff7-4840-a0d6-8585c560e109,
  abstract     = {<p>The analysis of fossil chironomid and diatom assemblages from a sedimentary record from Les Roustières peat bog (Massif Central, France, 1196 m asl) allows the reconstruction of past environmental and climate changes during the late-glacial and early Holocene. Chironomid assemblages showed that the infilling of the palaeolake had commenced during the Oldest Dryas (GS-2b) as suggested by the rapid decrease in chironomid species associated with the cold and deep zone of lakes and by their replacement by littoral and eutrophic taxa. Quantitative July temperature reconstructions, based on the chironomid data, suggest that mean July air temperature (Tjul) ranged between 6 °C and 11 °C at the termination of the Oldest Dryas period (GS-2b). Climate began to warm at the start of the Bølling period (GI-1e), between 15,000 and 14,800 cal yr BP, with a rise in Tjul of about 4 °C. This climate warming is contemporaneous with lake eutrophication as suggested by diatoms and chironomids. Maximum temperatures of 13–14 °C were reached around 13,600 cal yr BP during the Allerød period (GI-1c–GI-1a). The Younger Dryas period (GS-1) is marked by a return to cold conditions with Tjul of about 10 °C during a first phase, then 13 °C in its terminal part. A probable increase in the duration of the ice-cover may have favoured arctic and alpine diatom species. The early-Holocene climate improvement is marked by a rise in Tjul of about 3 °C.</p>},
  author       = {Gandouin, E. and Rioual, P. and Pailles, C. and Brooks, S. J. and Ponel, P. and Guiter, F. and Djamali, M. and Andrieu-Ponel, V. and Birks, H. J B and Leydet, M. and Belkacem, D. and Haas, J. N. and Van der Putten, N. and de Beaulieu, J. L.},
  issn         = {0031-0182},
  keyword      = {Corynocera ambigua,Palaeolimnology,Past aquatic ecosystem,Subfossil insects,Temperature reconstruction,Western Europe},
  language     = {eng},
  month        = {11},
  pages        = {292--309},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {Environmental and climate reconstruction of the late-glacial-Holocene transition from a lake sediment sequence in Aubrac, French Massif Central : Chironomid and diatom evidence},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2016.08.039},
  volume       = {461},
  year         = {2016},
}