New isoprenoid GDGT index as a water mass and temperature proxy in the Southern Ocean

Ishii, Hana; Seki, Osamu; Yamamoto, Masanobu; Duncan, Bella

doi:10.5194/cp-22-585-2026

Articles | Volume 22, issue 3

https://doi.org/10.5194/cp-22-585-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-22-585-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 3

Research article

|

12 Mar 2026

Research article |

| 12 Mar 2026

New isoprenoid GDGT index as a water mass and temperature proxy in the Southern Ocean

Hana Ishii, Osamu Seki, Masanobu Yamamoto, and Bella Duncan

Supplement

https://doi.org/10.5194/cp-22-585-2026-supplement

Data sets

HanaIshii-ANT/Southern-Ocean-isoGDGT-dataset-for-new-AIZ-index: Initial dataset release for Ishii et al. Hana Ishii https://doi.org/10.5281/zenodo.17060619

Short summary

We explore the utility of the archaeal-derived lipid biomarker as paleoenvironmental proxies in the Southern Ocean. Based on a reanalysis of the Southern Ocean dataset, we propose a new indicator for reconstructing zonal water mass movements in the Southern Ocean and temperatures in the Antarctic Zone. Applying this method to late Pleistocene sediment cores validates its reliability, confirming a valuable new tool for reconstructing the paleoenvironment of the Southern Ocean.