Climate of the Past
Climate of the Past
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Articles | Volume 22, issue 3
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

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Cited articles

Abelmann, A., Gersonde, R., Knorr, G., Zhang, X., Chapligin, B., Maier, E., Esper, O., Friedrichsen, H., Lohmann, G., Meyer, H., and Tiedemann, R.: The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, Nat. Commun., 6, 8136, https://doi.org/10.1038/ncomms9136, 2015. 
Ai, X. E., Studer, A. S., Sigman, D. M., Martínez-García, A., Fripiat, F., Thöle, L. M., Michel, E., Gottschalk, J., Arnold, L., Moretti, S., Schmitt, M., Oleynik, S., Jaccard, S. L., and Haug, G. H.: Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change, Science, 370, 1348–1352, https://doi.org/10.1126/science.abd2115, 2020. 
Ai, X. E., Thöle, L. M., Auderset, A., Schmitt, M., Moretti, S., Studer, A. S., Michel, E., Wegmann, M., Mazaud, A., Bijl, P. K., Sigman, D. M., Martínez-García, A., and Jaccard, S. L.: The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations, Commun. Earth Environ., 5, 58, https://doi.org/10.1038/s43247-024-01216-x, 2024. 
Alonso-Sáez, L., Andersson, A., Heinrich, F., and Bertilsson, S.: High archaeal diversity in Antarctic circumpolar deep waters, Env. Microbiol. Rep., 3, 689–697, https://doi.org/10.1111/j.1758-2229.2011.00282.x, 2011. 
Bale, N. J., Palatinszky, M., Irene, W., Rijpstra, C., Herbold, C. W., Wagner, M., Sinninghe Damsté, J. S., and Atomi, H.: Membrane lipid composition of the moderately thermophilic ammonia-oxidizing archaeon “Candidatus Nitrosotenuis uzonensis” at Different Growth Temperatures, Appl. Environ. Microbiol., 85, e01332-19, https://doi.org/10.1128/AEM.01332-19, 2019. 
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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.
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