|
Sign In to gain access to subscriptions and/or personal tools.
|
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences
Ian Snowball
Department of Quaternary Geology, Lund University, Tornavägen 13, SE-223 63 Lund, Sweden; ian.snowballKgeol.lu.se
Lovisa Zillén
Department of Quaternary Geology, Lund University, Tornavägen 13, SE-223 63 Lund, Sweden
Marie-José Gaillard
Division of Biology, School of Biosciences and Process Technology, Växjö University, SE-35195 Växjö, Sweden
Mineral magnetic, organic carbon and pollen studies of two varved Holocene lake-sediment sequences in the boreal forest of northern Sweden indicate that signi" cant environmental changes took place between c. 6000 and 5700 bc. This interval is characterized by an increase in mineral-matter accumulation, which is a proxy for winter-snow accumulation, and a statistically signi" cant decrease in total pollen in‘ ux (predominantly Pinus, Betula and Alnus), which may re‘ ect lower spring and summer temperatures and increased frost frequency. Notable increases in the in‘ ux of deciduous tree species (including Quercus and Corylus) suggest a rapid change to warmer conditions between 5700 and 5600 bc. Given dating errors associated with the varve chronologies and the Greenland ice-core timescales, the cold interval can be considered to re‘ ect a regional (possibly global) climatic cooling, which is often referred to as the ‘8.2 kyr BP cooling event’. However, the younger age of the cold event in northern Sweden does not support the hypothesis of forcing by the sudden drainage of Laurentide glacial lakes into the North Atlantic, unless a minimal 300-year delay in ocean-atmospheric coupling is accepted. The data contribute to a complex picture of early-Holocene environmental change, in response to deglaciation of the Northern Hemisphere.
Key Words: Varves • Holocene • rapid environment change • climatic change • pollen • mineral magnetism • northern Sweden
The Holocene, Vol. 12, No. 1,
7-16 (2002)
DOI: 10.1191/0959683602hl515rp
 CiteULike  Complore  Connotea  Del.icio.us  Digg  Reddit  Technorati  Twitter What's this?
This article has been cited by other articles:
|
|
|
|
 
L. Rubensdotter and G. Rosqvist
Influence of geomorphological setting, fluvial-, glaciofluvial- and mass-movement processes on sedimentation in alpine lakes
The Holocene,
June 1, 2009;
19(4):
665 - 678.
[Abstract]
[PDF]
|
|
|
|
|
|
|
V.N. Panizzo, V.J. Jones, H.J.B. Birks, J.F. Boyle, S.J. Brooks, and M.J. Leng
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway
The Holocene,
August 1, 2008;
18(5):
805 - 817.
[Abstract]
[PDF]
|
|
|
|
|
|
|
A. E.K. Ojala, T. Alenius, H. Seppa, and T. Giesecke
Integrated varve and pollen-based temperature reconstruction from Finland: evidence for Holocene seasonal temperature patterns at high latitudes
The Holocene,
June 1, 2008;
18(4):
529 - 538.
[Abstract]
[PDF]
|
|
|
|
|
|
|
M. Nyman, J. Weckstrom, and A. Korhola
Chironomid response to environmental drivers during the Holocene in a shallow treeline lake in northwestern Fennoscandia
The Holocene,
February 1, 2008;
18(2):
215 - 227.
[Abstract]
[PDF]
|
|
|
|
|
|
|
K. Sarmaja-Korjonen and H. Seppa
Abrupt and consistent responses of aquatic and terrestrial ecosystems to the 8200 cal. yr cold event: a lacustrine record from Lake Arapisto, Finland
The Holocene,
May 1, 2007;
17(4):
457 - 467.
[Abstract]
[PDF]
|
|
|
|
|
|
|
A. Nesje, A. E. Bjune, J. Bakke, S. O. Dahl, O. Lie, and H. J.B. Birks
Holocene palaeoclimate reconstructions at Vanndalsvatnet, western Norway, with particular reference to the 8200 cal. yr BP event
The Holocene,
July 1, 2006;
16(5):
717 - 729.
[Abstract]
[PDF]
|
|
|
|
|
|
|
S. Prasad, A. Brauer, B. Rein, and J. F. W. Negendank
Rapid climate change during the early Holocene in western Europe and Greenland
The Holocene,
February 1, 2006;
16(2):
153 - 158.
[Abstract]
[PDF]
|
|
|
|
|
|
|
A. Nesje, S. O. Dahl, and J. Bakke
Were abrupt Lateglacial and early-Holocene climatic changes in northwest Europe linked to freshwater outbursts to the North Atlantic and Arctic Oceans?
The Holocene,
February 1, 2004;
14(2):
299 - 310.
[Abstract]
[PDF]
|
|
|
|
|
|
|
I. Snowball, I. Snowball, and P. Sandgrena
Geomagnetic field variations in northern Sweden during the Holocene quantified from varved lake sediments and their implications for cosmogenic nuclide production rates
The Holocene,
July 1, 2002;
12(5):
517 - 530.
[Abstract]
[PDF]
|
|
|
|
|
