Description: Seasonal to annual quantitative reconstructions of spatially-explicit climate state variables for the last 2000 years across the world are recognized as one of the primary targets for current climate research. Varved (annually laminated) lake sediments play a key role in this context because they provide seasonally resolved paleoclimate archives with a very good chronology. The minerogenic varves in Lake Oeschinen, a proglacial lake in the northern Swiss Alps will be used to establish the first quantitative summer precipitation record back to ca. 1000 AD for Switzerland. In a pilot study for the varves AD 1920-1986, we have established that varve thickness and mineralogical composition is a good predictor for MJJA precipitation (r=0.64, p<0.05). Phyllosilicate influx is related to rain stroms whereas calcite influx is related to glacial meltwater. Novel scanning techniques (reflectance spectroscopy 380-730 nm) will be explored to analyze sediment compositions at very high (mm-scale) resolution.
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Origins: /Bund/UBA/UFORDAT
Tags: Paläoklimatologie ? Zufluss ? Silikat ? Seen ? Kalibrierung ? Seensediment ? Schweiz ? Gletscherschwund ? Regenwasser ? Sedimentanalyse ? Sommer ? Spektralanalyse ? Prognose ? Zeitreihenanalyse ? Alpen ? Limnologie ? Quantitative Analyse ? Regen ? Studie ? Bewertungskriterium ? Calcit ? Sediment ? Chemische Zusammensetzung ? Jahreszeit ? Klimaforschung ? Mineral ? Niederschlag ? Sedimentation ? Klimawandel ? Klimadaten ? Oeschinensee ? Schmelzwasser ? See [Binnengewässer] ? Validierung ? biochemical varve ? minerogenic varve ? reflectance spectroscopy ? varve thickness ? Ablagerung ? Phyllosilikat ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2011-12-01 - 2014-11-30
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