Calibrating and validating scanning VIS Reflectance Spectroscopy data (380 - 730 nm) from minerogenic and biochemical varves: improving climate reconstructions from lake sediments

Description: Das Projekt "Calibrating and validating scanning VIS Reflectance Spectroscopy data (380 - 730 nm) from minerogenic and biochemical varves: improving climate reconstructions from lake sediments" wird/wurde gefördert durch: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung. Es wird/wurde ausgeführt durch: Universität Bern, Geographisches Institut, Gruppe für Klimatologie,Meteorologie.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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Origin: /Bund/UBA/UFORDAT

Tags: Paläoklimatologie ? Zufluss ? Silikat ? Seen ? Kalibrierung ? Seensediment ? Schweiz ? Gletscherschwund ? Chemische Zusammensetzung ? Regenwasser ? Schmelzwasser ? Sedimentanalyse ? Sommer ? Spektralanalyse ? Prognose ? Zeitreihenanalyse ? Quantitative Analyse ? Regen ? Bewertungskriterium ? Calcit ? Studie ? Jahreszeit ? Sediment ? Limnologie ? Alpen ? Klimaforschung ? Sedimentation ? Klimawandel ? Mineral ? Niederschlag ? Klimadaten ? Oeschinensee ? Validierung ? biochemical varve ? Ablagerung ? minerogenic varve ? reflectance spectroscopy ? varve thickness ? Phyllosilikat ? See [Binnengewässer] ?

License: cc-by-nc-nd/4.0

Language: Englisch/English

Organisations

• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Bereitsteller*in)
• Umweltbundesamt (Bereitsteller*in)
• Universität Bern, Geographisches Institut, Gruppe für Klimatologie,Meteorologie (Betreiber*in)

Time ranges: 2011-12-01 - 2014-11-30

Status

Aktiv

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