Journal of Paleolimnology

, Volume 34, Issue 4, pp 471–480 | Cite as

Limnic Responses to Increased Effective Humidity during the 8200 cal. yr BP Cooling Event in Southern Sweden

  • Dan Hammarlund
  • Svante Björck
  • Bjørn Buchardt
  • Charlotte T. Thomsen
Article

Abstract

Highly resolved sediment stratigraphic and stable isotope records from a lake in south-central Sweden give evidence of relatively humid summers during the wide-spread cold event at c. 8200 cal. BP. A transient lake-level rise led to increased catchment erosion followed by enhanced phytoplankton production and disturbance of the Chara-dominated algal community. An associated increase in the deposition of organic material resulted in hypolimnetic oxygen deficit and methane formation as inferred from elevated sulphur content of the sediments and strong depletion in 13C of bulk organic material. In combination with dry and cold winter conditions as revealed by other proxy records, these data suggest the development of a strongly seasonal climate in northwestern Europe in response to altered atmospheric circulation at this stage. Enhanced zonal circulation with frequent cyclonic activity and increased effective humidity probably characterized the summer climate of southern and central Scandinavia, consistent with conditions inferred for continental Europe. In contrast, the winter climate was dominated by blocking high-pressure circulation, giving rise to cold and dry conditions.

Keywords

Carbon isotopes Holocene Lake sediments Oxygen isotopes Palaeoclimate Sulphur content 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Dan Hammarlund
    • 1
  • Svante Björck
    • 1
  • Bjørn Buchardt
    • 2
  • Charlotte T. Thomsen
    • 2
  1. 1.GeoBiosphere Science Centre, Quaternary SciencesLund UniversityLundSweden
  2. 2.Geological InstituteUniversity of CopenhagenCopenhagen KDenmark

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