Glycerol dialkyl glycerol tetraethers are a class of lipid biomarkers that in recent decades have been show to act as paleoclimate indicators in lake sediment. New research and recent methodological advances have shown that the 5’ methyl branched tetraether index (MBT^5’­­_Me ) correlates well with temperature, however its use as a paleoclimate marker requires the development of calibration estimates for the areas under investigation.

Efforts are underway to generate global, regional, and lake-specific temperature calibrations for the MBT^5’_Me index, however none have been made for Canadian regions, and particularly the Arctic, where climate warming is particularly pronounced and is relatively understudied. This study analyzed two transects in Canada, one using lacustrine surface sediment from lakes on the Western coast of Canada, and the other from the Eastern Coast of Canada through Quebec and along the Hudson Bay to create two separate temperature calibrations for use in Canadian ecozones.

Preliminary modelling of the Western transect demonstrates that the MBT^5’_Me index is inversely correlated with latitude, showing promising results for its use as a paleoclimate indicator in lake sediments from these regions.

Lieu
Laboratoire METIS, Sorbonne Université, Campus Pierre et Marie Curie
4, place Jussieu 75005 Paris
Salle Darcy, tour 46-56, 3^e étage.

Lien zoom
https://cnrs.zoom.us/j/95391158198?pwd=SEVsR3hzQlpXQlNPMW1vWFptT2N6Zz09
ID de réunion : 953 9115 8198
Code secret : w87wvH