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Mats Rundgren

Mats Rundgren

Universitetslektor

Mats Rundgren

Abrupt climatic changes and an unstable transition into a late Holocene Thermal Decline: a multiproxy lacustrine record from southern Sweden

Författare

  • Catherine Jessen
  • Mats Rundgren
  • Svante Björck
  • Dan Hammarlund

Summary, in English

The transition from a middle Holocene relatively warm and stable climate to a cooler and unstable late Holocene climate is reconstructed using sediments from Lake Igelsjon, south-central Sweden. This multiproxy study illustrates local, regional and global scale responses to climatic change by focusing on a previously identified abrupt hydrological shift to cooler and/or wetter conditions around 4000 cal. yr BP. The results suggest that between ca. 4600 and ca. 3400 cal. yr BP, the environment around and within the lake responded in two major, well-defined steps: the first between 4450 and 4350 cal. yr BP and the second between 4000 and 3800 cal. yr BP. A series of rapid fluctuations of short duration were superimposed on the general cooling trend, with the most severe aquatic response peaking at ca. 3800 cal. yr BP. Pollen percentage and influx values show forest composition and pollen productivity changes and a distinct decline in total and Corylus pollen influx in the period of 4000-3500 cal. yr BP. Stomatal-based reconstruction of atmospheric CO2 concentration produced a tenuous decrease with a minimum between 3650 and 3500 cal. yr BP.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2005

Språk

Engelska

Sidor

349-362

Publikation/Tidskrift/Serie

Journal of Quaternary Science

Volym

20

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley and Sons

Ämne

  • Geology

Nyckelord

  • Sweden
  • Holocene climatic transition
  • lake sediments
  • multiproxy
  • CO2

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1099-1417