Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene ...

• Main Authors: Orme, Lisa Claire, Crosta, Xavier, Miettinen, Arto, Divine, Dmitry V., Husum, Katrine, Isaksson, Elisabeth, Wacker, Lukas, Mohan, Rahul, Ther, Olivier, Ikehara, Minoru
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2020
• Subjects: ice core; Southern Ocean
• Online Access: https://dx.doi.org/10.3929/ethz-b-000438692; http://hdl.handle.net/20.500.11850/438692

Centennial- and millennial-scale variability of Southern Ocean temperature over the Holocene is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variations in the region coming mainly from ice core records. Here we present a high-resolution (∼60 year), diatom-based sea surface temperature (SST) reconstruction from the western Indian sector of the Southern Ocean that spans the interval 14.2 to 1.0 ka (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2–12.9 ka and gradual warming between 12.9 and 11.6 ka in phase with atmospheric temperature evolution. This supports the evolution of the Southern Ocean SST during the deglaciation being linked with a complex combination of processes and drivers associated with reorganisations of atmospheric and oceanic circulation patterns. Specifically, we suggest that Southern Ocean surface warming ... : Climate of the Past, 16 (4) ...