Antarctic sea ice over the past 130 000 years - Part 1: a review of what proxy records tell us ...

• Main Authors: Crosta, X, Kohfeld, KE, Bostock, HC, Chadwick, M, Vivier, AD, Esper, O, Etourneau, J, Jones, J, Leventer, A, Müller, J, Rhodes, RH, Allen, CS, Ghadi, P, Lamping, N, Lange, CB, Lawler, KA, Lund, D, Marzocchi, A, Meissner, KJ, Menviel, L, Nair, A, Patterson, M, Pike, J, Prebble, JG, Riesselman, C, Sadatzki, H, Sime, LC, Shukla, SK, Thöle, L, Vorrath, ME, Xiao, W, Yang, J
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus GmbH 2022
• Subjects: 37 Earth Sciences; 3708 Oceanography; 3709 Physical Geography and Environmental Geoscience; 3705 Geology; 13 Climate Action; 14 Life Below Water; Antarctic; Antarc*; ice core; Ice Shelf; Sea ice
• Online Access: https://dx.doi.org/10.17863/cam.88887; https://www.repository.cam.ac.uk/handle/1810/341460

Abstract. Antarctic sea ice plays a critical role in the Earth system, influencing energy, heat and freshwater fluxes, air–sea gas exchange, ice shelf dynamics, ocean circulation, nutrient cycling, marine productivity and global carbon cycling. However, accurate simulation of recent sea-ice changes remains challenging and, therefore, projecting future sea-ice changes and their influence on the global climate system is uncertain. Reconstructing past changes in sea-ice cover can provide additional insights into climate feedbacks within the Earth system at different timescales. This paper is the first of two review papers from the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) working group. In this first paper, we review marine- and ice core-based sea-ice proxies and reconstructions of sea-ice changes throughout the last glacial–interglacial cycle. Antarctic sea-ice reconstructions rely mainly on diatom fossil assemblages and highly branched isoprenoid (HBI) alkenes in marine sediments, supported by ...