Limnic Responses to Increased Effective Humidity during the 8200 cal. yr BP Cooling Event in Southern Sweden
Received: 13 January 2005 Accepted: 04 April 2005 DOI:
10.1007/s10933-005-5614-z Cite this article as: Hammarlund, D., Björck, S., Buchardt, B. et al. J Paleolimnol (2005) 34: 471. doi:10.1007/s10933-005-5614-z 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 References Alley, R.B., Mayewski, P.A., Sowers, T., Stuiver, M., Taylor, K.C., Clark, P.U. 1997 Holocene climatic instability: a prominentwidespread event 8200 yr ago Geology 25 483 486 CrossRef Google Scholar Baldini, J.U.L., McDermott, F., Fairchild, I.J. 2002 Structure of the 8200-year cold event revealed by a speleothem trace element record Science 296 2203 2206 CrossRef PubMed Google Scholar Barber, D.C., Dyke, A., Hillaire-Marcel, C., Jennings, A.E., Andrews, J.T., Kerwin, M.W., Bilodeau, G., McNeely, R., Southon, J., Morehead, M.D., Gagnon, J.-M. 1999 Forcing of the cold event of 8,200 years ago by catastrophic drainage of Laurentide lakes Nature 400 344 348 CrossRef Google Scholar Barker, J.F., Fritz, P. 1981 The occurrence and origin of methane in some groundwater-flow systems Can. J. Earth Sci. 18 1802 1816 Google Scholar Bergman, J., Hammarlund, D., Hannon, G., Barnekow, L., Wohlfarth, B. 2005 Deglacial vegetation succession and Holocene tree-limit dynamics in the Scandes Mountains, west-central Sweden: stratigraphic data compared to megafossil evidence Rev. Palaeobot. Palynol. 134 129 151 CrossRef Google Scholar Björck, S., Digerfeldt, G. 1984 Climatic changes at Pleistocene/Holocene boundary in the Middle Swedish end moraine zonemainly inferred from stratigraphic indications Mörner, N.-A. Karlén, W. eds. Climatic Changes on a Yearly to Millenial Basis Reidel Dordrecht 37 56 Google Scholar Blindow, I. 1992 Decline of charophytes during eutrophication – comparison with angiosperms Freshw. Biol. 28 9 14 Google Scholar Bond, G., Kromer, B., Beer, J., Muscheler, R., Evans, M.N., Showers, W., Hoffmann, S., Lotti-Bond, R., Hajdas, I., Bonani, G. 2001 Persistent solar influence on North Atlantic climate during the Holocene Science 294 2130 2136 CrossRef PubMed Google Scholar Bond, G., Showers, W., Cheseby, M., Lotti, R., Almasi, P., deMenocal, P., Priore, P., Cullen, H., Hajdas, I., Bonani, G. 1997 A pervasive millenial-scale cycle in North Atlantic Holocene and Glacial climates Science 278 1257 1266 CrossRef Google Scholar Buchardt, B., Clausen, J., Thomsen, E. 1985 Carbon isotope composition of Lower Palaeozoic kerogen: effects of maturation Adv. Org. Geochem. 10 127 134 CrossRef Google Scholar Dahl, S.O., Nesje, A. 1996 A new approach to calculating Holocene winter precipitation by combining glacier equilibrium-line altitudes and pine-tree limits: a case study from Hardangerjøkulen, Norway Holocene 6 381 398 Google Scholar Dean, W.E., Forester, R.M., Bradbury, J.P. 2002 Early Holocene change in atmospheric circulation in the Northern Great Plains: an upstream view of the 8.2 ka cold event Quat. Sci. Rev. 21 1763 1775 CrossRef Google Scholar
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