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Dan Hammarlund

Dan Hammarlund

Professor

Dan Hammarlund

Limnic responses to increased effective humidity during the 8200 cal. Yr BP cooling event in southern Sweden

Författare

  • Dan Hammarlund
  • Svante Björck
  • B Buchardt
  • CT Thomsen

Summary, in English

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 C-13 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.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2005

Språk

Engelska

Sidor

471-480

Publikation/Tidskrift/Serie

Journal of Paleolimnology

Volym

34

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Geology

Nyckelord

  • oxygen isotopes
  • lake sediments
  • carbon isotopes
  • holocene
  • palaeoclimate
  • sulphur content

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0921-2728