Reconciling diverse lacustrine and terrestrial system response to penultimate deglacial warming in southern Europe
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University of Chester, University of Hull, University of Sussex, University of Manchester, University College LondonPublication Date
2015-09-01
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Unlike the most recent deglaciation, the regional expression of climate changes during the penultimate deglaciation remains understudied, even though it led into a period of excess warmth with estimates of global average temperature 1‒2 °C, and sea level ~6 m, above preindustrial values. We present the first complete high-resolution southern European diatom record capturing the penultimate glacial-interglacial transition, from Lake Ioannina (northwest Greece). It forms part of a suite of proxies selected to assess the character and phase relationships of terrestrial and aquatic ecosystem response to rapid climate warming, and to resolve apparent conflicts in proxy evidence for regional paleohydrology. The diatom data suggest a complex penultimate deglaciation driven primarily by multiple oscillations in lake level, and provide firm evidence for the regional influence of abrupt changes in North Atlantic conditions. There is diachroneity in lake and terrestrial ecosystem response to warming at the onset of the last interglacial, with an abrupt increase in lake level occurring ~2.7 k.y. prior to sustained forest expansion with peak precipitation. We identify the potentially important role of direct input of snow melt and glacial meltwater transfer to the subterranean karst system in response to warming, which would cause rising regional groundwater levels. This explanation, and the greater sensitivity of diatoms to subtle changes in temperature, reconciles the divergent lacustrine and terrestrial proxy evidence and highlights the sensitivity of lakes situated in mountainous karstic environments to past climate warming.Citation
Wilson, G. P., Reed, J. M., Frogley, M. R., Hughes, P. D. & Tzedakis, P. C. (2015). Reconciling diverse lacustrine and terrestrial system response to penultimate deglacial warming in southern Europe. Geology, 43(9), 819-822.doi: 10.1130/g36807.1Publisher
The Geological Society of AmericaJournal
GeologyDOI
10.1130/G36807.1Additional Links
http://geology.gsapubs.org/Type
ArticleLanguage
enISSN
0091-7613EISSN
1943-2682Sponsors
Funded by the UK Natural Environment Research Council (NERC grant numbers NE/C507210/1 and NER/A/S/2002/00946)ae974a485f413a2113503eed53cd6c53
10.1130/G36807.1
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