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Seminaris
OCEAN & CLIMATE SEMINAR: "Hydroxylated tetraether lipids as sea surface temperature proxies in the Gulf of Lions and the Iberian Margin during the last glacial cycle", by Nina Davtian

Date: 2020-02-03

OCEAN & CLIMATE SEMINAR

 

Title: "Hydroxylated tetraether lipids as sea surface temperature proxies in the Gulf of Lions and the Iberian Margin during the last glacial cycle"
 
Speaker: Nina Davtian,  Collège de France, CEREGE, France
 

Date: Monday, February 3rd 2020
Time: 12h
Venue: Room Z/022-23

 

Abstract: Hydroxylated tetraethers (OH-GDGTs) are membrane lipids produced by ammonia-oxidizing archaea. Following a regional and global core-top study, the ubiquity of OH-GDGTs has been established in the marine realm and novel organic proxies, the Ring Indices of OH-GDGTs (RI-OH and RI-OH') have been proposed for sea surface temperature (SST) reconstructions. The novel RI-OH and RI-OH' proxies are thus potential alternatives to established SST proxies, such as the oxygen isotopic composition of planktic foraminifers, the C37 ketone unsaturation ratio (UK′37) and the TetraEther indeX of tetraethers consisting of 86 carbon atoms (TEX86). However, the paleothermometric potential of RI-OH and RI-OH' has barely been tested in paleoclimatic archives. In this seminar, I will report the analytical developments I conducted during my PhD to improve the analysis of tetraether-based proxies. Then, I will introduce two promising attempts to validate the novel RI-OH and RI-OH' SST proxies under contrasting (paleo)environemental contexts during the last glacial cycle (last 160,000 years). The first attempt focuses on RI-OH-based paleothermometry in a shallow core from the Gulf of Lions in the western Mediterranean Sea. The second attempt focuses on RI-OH'-based paleothermometry in a deep-sea sediment core located in the Iberian Margin. More specifically, I will present the main results based on proxy-proxy comparisons for both attempts, a regional compilation of glacial-interglacial SST anomalies for the first attempt and phase relationship studies as well as the application of the bipolar seesaw model for the second attempt. 

Bio:
Nina Davtian is a postdoctoral research assistant at the Collège de France, Climate and Ocean Evolution, CEREGE, France. She started her education as an undergraduate at the prestigious ENS de Lyon, and completed several research internships, including one at CEREGE (cosmogenic isotopes) and another at MARUM, Germany (organic geochemistry). After her PhD at CEREGE/Aix-Marseille University, she started to further validate novel organic paleothermometers, which she first tested with the analytical method that she developed during her PhD. More specifically, Nina performs proxy-proxy comparisons and phase relationship studies between proxies in a given study site as well as between marine and ice core climatic records. Nina's present reasearch interests include tetraether-based paleothermometers and source indicators as well as paleoclimatology, paleoenvironments and paleoceanography (Quaternary glacial-interglacial cycles and millenial climatic events). Furthermore, Nina is motivated to broaden her areas of expertise by working on other biomarkers than tetraethers, conducting compound specific isotope analyses, including radiocarbon, and studying modern samples as well as pre-Quaternary climatic archives.

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