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In-situ cosmogenic 14C analysis at ETH Zürich: Characterization and performance of a new extraction system
(2019)Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and AtomsWe present a new in-situ cosmogenic 14C extraction system developed at ETH Zürich. This system quantitatively extracts 14C produced in quartz by cosmic rays using a high temperature extraction procedure. A key improvement of the new extraction system is the implementation of largely automated sequences, CO2 transport in a He flow and the addition of a “dead” CO2 carrier gas, which ensure highly reproducible operation while limiting the ...Journal Article -
Temporal constraints on lateral organic matter transport along a coastal mud belt
(2019)Organic GeochemistryConstraints on timescales of lateral transport of sedimentary organic carbon (OC) over continental shelves and associated influences on the distribution and abundance of OC remain sparse. Preferential degradation of labile, young OC during lateral transport results in apparent “diagenetic aging” of OC. Additionally, sediment translocation can also result in “transport time-associated aging” of associated organic matter (OM) as a function ...Journal Article -
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian margin
(2019)Paleoceanography and PaleoclimatologyThis study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so‐called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon content of both the leachate and leached sample enabled us to identify surface contamination of the tests and its impact on their 14C ages. ...Journal Article -
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction
(2019)Earth and Planetary Science LettersAccurate chronologies are the backbone of paleoclimate research, yet for marine sedimentary records the same age model is often applied to co-eval components that may have experienced different pre-depositional histories, leading to aliasing in corresponding proxy signals. Here we demonstrate 14C age discrepancies among several proxy carriers and use them to highlight spatio-temporal disparities among different components of the sediment. ...Journal Article