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  • AGE; B14; Carbon Preference Index, n-Alkanes (C25-C33); Core; CORE; DEPTH, sediment/rock; Lake Barombi; Median values; n-Alkane C25, per unit sediment mass; n-Alkane C26, per unit sediment mass; n-Alkane C27, per unit sediment mass; n-Alkane C28, per unit sediment mass; n-Alkane C29, per unit sediment mass; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C29, δD; n-Alkane C29, δD, standard deviation; n-Alkane C30, per unit sediment mass; n-Alkane C31, per unit sediment mass; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; n-Alkane C32, per unit sediment mass; n-Alkane C33, per unit sediment mass; n-Alkane C33, δ13C; n-Alkane C33, δ13C, standard deviation; n-Alkane C33, δD; n-Alkane C33, δD, standard deviation; Quantile (Q0.025); Quantile (Q0.16); Quantile (Q0.84); Quantile (Q0.975)  (1)
  • AGE; Meerfelder Maar; Meerfelder Maar, Germany; MFM09A/D; PCUWI; Piston corer, UWITEC; Silicon; Silicon/Titanium ratio; Titanium; Varve age; X-ray fluorescence (XRF)  (1)
  • Helmholtz-Verbund Regionale Klimaänderungen = Helmholtz Climate Initiative (Regional Climate Change); REKLIM  (1)
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  • 1
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    PANGAEA
    In:  Supplement to: Martín-Puertas, Celia; Brauer, Achim; Dulski, Peter; Brademann, Brian (2012): Testing climate-proxy stationarity throughout the Holocene: an example from the varved sediments of Lake Meerfelder Maar (Germany). Quaternary Science Reviews, 58, 56-65, https://doi.org/10.1016/j.quascirev.2012.10.023
    Publication Date: 2023-03-16
    Description: Lake Meerfelder Maar (Germany) provides a varved record from the Last Glacial/Interglacial transition back to ca 1500 years BP. This study shows results for the Holocene sequence from new cores collected in 2009 based on varve counting, microfacies and micro-XRF analyses. The main goal of combining those analyses is to provide a new approach for interpreting long-term palaeolimnological proxy data and testing the climate-proxy stationarity throughout the current interglacial period. Varve counting provides a new independent Holocene chronology (MFM2012) with an estimated counting error of 1-0.5% and supported by 14C dating. Varve structure and thickness and geochemical composition of the varves give information about the main environmental processes that affect the lake and its catchment as well as the possible climate variability behind. Varves are couplets of i) a spring/summer laminae composed of monospecific diatom blooms and ii) an autumn/winter sub-layer made of minerogenic material and re-worked sediments. Thickness of the varves and sub-layers reflect lake variability and allow seasons to be distinguished as well as seasonal proxies. Changes in the winter minerogenic influx into the lake are reflected by Ti intensities and the Si/Ti ratio as a indicator for diatom concentration, which can be used as a proxy for water circulation during the early spring. Long-term variability of geochemical composition shows a reduction of the detrital material input (Ti) at 5,000 varve yrs BP and a visible sensitivity to water mixing (Si/Ti) during the Late Holocene. Variations of Ti intensities during the early and mid-Holocene do not show a clear relationship with climate. In contrast, higher values of the Si/Ti ratio together with thicker varves have been interpreted as wind-stress phases, which coincide with centennial variability of European cold/wet episodes during the Late Holocene. Our findings show that a long-term change in the lake and/or variability of the climate system can influence proxy sensitivity of a lacustrine record.
    Keywords: Helmholtz-Verbund Regionale Klimaänderungen = Helmholtz Climate Initiative (Regional Climate Change); REKLIM
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-06-27
    Keywords: AGE; Meerfelder Maar; Meerfelder Maar, Germany; MFM09A/D; PCUWI; Piston corer, UWITEC; Silicon; Silicon/Titanium ratio; Titanium; Varve age; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 135237 data points
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2024-02-14
    Keywords: AGE; B14; Carbon Preference Index, n-Alkanes (C25-C33); Core; CORE; DEPTH, sediment/rock; Lake Barombi; Median values; n-Alkane C25, per unit sediment mass; n-Alkane C26, per unit sediment mass; n-Alkane C27, per unit sediment mass; n-Alkane C28, per unit sediment mass; n-Alkane C29, per unit sediment mass; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C29, δD; n-Alkane C29, δD, standard deviation; n-Alkane C30, per unit sediment mass; n-Alkane C31, per unit sediment mass; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; n-Alkane C32, per unit sediment mass; n-Alkane C33, per unit sediment mass; n-Alkane C33, δ13C; n-Alkane C33, δ13C, standard deviation; n-Alkane C33, δD; n-Alkane C33, δD, standard deviation; Quantile (Q0.025); Quantile (Q0.16); Quantile (Q0.84); Quantile (Q0.975)
    Type: Dataset
    Format: text/tab-separated-values, 8574 data points
    Location Call Number Limitation Availability
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