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Simulating the Holocene Lake-Level Record of Lake Bysjön, Southern Sweden

Published online by Cambridge University Press:  20 January 2017

Jüri Vassiljev ,
Sandy P. Harrison  and
Joël Guiot
Jüri Vassiljev
Affiliation:
Dynamic Palaeoclimatology, Lund University, Box 117, S-221 00, Lund, Sweden
Sandy P. Harrison
Affiliation:
Dynamic Palaeoclimatology, Lund University, Box 117, S-221 00, Lund, Sweden
Joël Guiot
Affiliation:
Laboratoire de Botanique Historique et Palynologie, Faculté des Sciences St Jérôme, CNRS UA 1152, F-13397, Marseille Cedex 13, France
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Abstract

Lake Bysjön, southern Sweden, has experienced major lake-level lowerings during the Holocene, with one interval about 9000 14C yr B.P. when water level dropped ca. 7 m and the lake became closed. These changes were not solely due to known changes in radiation budgets or seasonal temperatures. Simulations with a lake-catchment model indicate that, given the actual changes in radiation and temperatures, all the observed lake-level lowerings (including the major lowering at 9000 14C yr B.P.) could have occurred in response to precipitation changes of <75 mm/yr when winter temperatures were warmer than today. In these circumstances, the reduction of runoff into the lake caused by increased evapotranspiration during the late winter and spring, combined with relatively small changes in precipitation, was sufficient for the lake to become closed. When winter temperatures were colder than today, the reduction in winter runoff related to reduced precipitation was only very slight and insufficient to lower the lake below threshold. In such circumstances, changes in outflow were sufficient to compensate for the combined changes in precipitation and runoff, and lake level therefore remained unchanged.

Type
Research Article
Information
Quaternary Research , Volume 49 , Issue 1 , January 1998 , pp. 62 - 71
Copyright
University of Washington

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