Response of the Southern Ocean to millennial-scale climate change during marine isotope stage three ...

• Main Author: Anderson, HJ
• Format: Thesis
• Language: unknown
• Published: University of Tasmania 2024
• Subjects: Antarctic; Pacific; Southern Ocean; Antarc*; Antarctica; ice core
• Online Access: https://dx.doi.org/10.25959/23246558.v2; https://figshare.utas.edu.au/articles/thesis/Response_of_the_Southern_Ocean_to_millennial-scale_climate_change_during_marine_isotope_stage_three/23246558/2

Ice core records show that Antarctica rapidly warmed and cooled on centennial to millennial-timescales during marine isotope stage 3 (MIS-3). These warming events are called Antarctic Isotope Maxima (AIM) and are linked to opposing counterparts in the Northern hemisphere — called Dansgaard-Oeschger (D-O) events — through slowdowns of the Atlantic meridional overturning circulation (AMOC). Southern Hemisphere warming during AIM warming events is associated with increasing atmospheric CO2, which the Southern Ocean is thought to play a significant role in modulating. This thesis explores the role of Southern Ocean processes that affect the carbon cycle and climate change during MIS-3 by compiling high-resolution MIS-3 sea surface temperature records, developing a new record of biological and physical changes in the Subantarctic southwest Pacific sector of the Southern Ocean, and using these data to validate a coupled ocean-atmosphere and general circulation modelling.In Chapter two of this thesis, a compilation ...