News & Events

Noon seminar - Biomarkers in Arctic Lakes: From interglacials in Siberia and Baffin to the first...

Monday, October 22, 2018, 12:15PM - 1:15PM

Speaker

Greg de Wet

INSTAAR

Location:

SEEC room S228 (Sievers Room)

Full title

Biomarkers in Arctic Lakes: From interglacials in Siberia and Baffin to the first people in the Faroe Islands

Abstract

The Arctic has proven to be one on the most climatically sensitive regions on Earth and is predicted to warm two to three times more than the global average by the year 2100. To properly contextualize this projected dramatic change, detailed reconstructions of past conditions, especially from periods warmer than today, are necessary. In this talk I will present how diagnostic organic molecules, known as biomarkers, can be utilized to reconstruct past environmental conditions from Arctic lake sediments. I will highlight proxies for temperature, vegetation change, and human presence in a landscape, with particular emphasis on the application of a paleotemperature proxy based on bacterial membrane lipids called glycerol dialkyl glycerol tetraethers (brGDGTs). I will show examples from ‘super interglacial’ Marine Isotope Stage 31 from Lake El’gygytgyn in the Siberian Arctic, SW Greenland during the period of Norse Settlement, the Faroe Islands, and discuss my current post-doctoral research here at INSTAAR as part of the PACEMAP project focused on Baffin Island in the Canadian Arctic.

Audience

Free and open to the public.