Articles | Volume 19, issue 4
Research article
04 Apr 2023
Research article |  | 04 Apr 2023

Lipid-biomarker-based sea surface temperature record offshore Tasmania over the last 23 million years

Suning Hou, Foteini Lamprou, Frida S. Hoem, Mohammad Rizky Nanda Hadju, Francesca Sangiorgi, Francien Peterse, and Peter K. Bijl

Data sets

sea-surface temperature proxy data (TEX86 and UK'37) from Ocean Drilling Program Site 1168 P. K. Bijl, F. S. Hoem, and S. Hou

Short summary
Neogene climate cooling is thought to be accompanied by increased Equator-to-pole temperature gradients, but mid-latitudes are poorly represented. We use biomarkers to reconstruct a 23 Myr continuous sea surface temperature record of the mid-latitude Southern Ocean. We note a profound mid-latitude cooling which narrowed the latitudinal temperature gradient with the northward expansion of subpolar conditions. We surmise that this reflects the strengthening of the ACC and the expansion of sea ice.