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Imaging the past – micrometer-scale analysis of molecular proxies for climate reconstruction
 
MARUM - Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
Thu, Mar. 25th 2021, 11:00-12:00
Séminaire en distanciel

Conventionally, paleoclimate reconstruction with lipid biomarkers involves the extraction of millimeter- to centimeter-sized sediment samples and subsequent analysis of the lipid extract using gas or liquid chromatographic methods. In addition to the rather time-consuming procedure, the need for several milligrams of sediment limits the temporal resolution, since, depending on the sedimentation rate, hundreds to thousands of years are combined in one sample. As a result, abrupt or short-term climatic phenomena operating on annual or decadal time scales can hardly be assessed.

Using the direct and extraction-free approach of mass spectrometry imaging (MSI), we can analyze lipid biomarkers within intact subsamples from sediment cores at micrometer-scale resolution. In this presentation, I will introduce the concept of MSI and provide examples of the application of this high-resolution biomarker data. I will discuss the factors shaping molecular proxy signals in the Santa Barbara Basin, a reconstruction of the climate signal in the Arabian Sea during the 20th century, and the marine and terrestrial response to the abrupt Younger Dryas transition in the Cariaco Basin and Meerfelder Maar.


https://www.marum.de/en/Susanne-Alfken.html
Contact : Juliette Lathiere
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