Data Publications

Supplementary material to Mangili et al. (2010): Climatic implications of annual to decadal resolution stable isotope data from calcite varves of the Piànico interglacial lake record, Southern Alps

hasData_Center_Short_Name
  • SDDB
hasDataset_Online_Resource
hasDataset_Release_Date
  • 2010
hasDataset_Title
  • Supplementary material to Mangili et al. (2010): Climatic implications of annual to decadal resolution stable isotope data from calcite varves of the Piànico interglacial lake record, Southern Alps
hasEntry_ID
  • 10.1594/GFZ.SDDB.1301
hasReference
  • 10.1016/j.gloplacha.2010.01.027 http://dx.doi.org/10.1016/j.gloplacha.2010.01.027 Supplement to: Mangili, C., Plessen, B., Wolff, C., Brauer, A. (2010): Climatic implications of annual to decadal resolution stable isotope data from calcite varves of the Piànico interglacial lake record, Southern Alps
hasSummary
  • Stable oxygen isotope analyses at annual, 2-, 5-, 10- and 20-varve sample resolutions were carried out on two selected varve intervals from the interglacial sediment record of the Pianico palaeolake. These sediments are particularly suitable for ultra-high-resolution isotope analyses on lacustrine endogenic calcite because of the exceptionally well-preserved varve structure. A bias through detrital contamination can be excluded because microscopically controlled sampling enabled selecting detritus-free samples. The studied sediment intervals comprise 352 and 88 continuous varve series formed during periods of rapid climate change at the onset and end of a marked millennial-scale cool interval during the Pianico Interglacial. The most intriguing result is a pronounced short-term oscillation in the bi-annually resolved isotope record superimposed on the general decreasing and increasing delta-18O trends at the climatic transitions that is recorded at lower sample resolution. Spectral analyses of the bi-annual time series reveal periodicities indicating solar and NAO controls on the delta-18O record. Multiple delta-18O measurements from endogenic calcite of individual varves showed variations of up to 0.6 per mill, thus larger than the observed inter-annual variability and most likely explained by seasonal effects.
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