A late Pleistocene dataset of Agulhas Current variability

Area of Science:

• Paleoceanography
• Climate Science
• Quaternary Geology

Background:

• Agulhas leakage influences the Atlantic Meridional Overturning Circulation (AMOC).
• Agulhas Current variability shapes African hydroclimate.
• Long-term records beyond the last glacial cycle are missing.

Purpose of the Study:

• To establish the first continuous paleoceanographic record from the Agulhas Current core region.
• To reconstruct hydrographic variability over the past 270,000 years.
• To provide data for understanding Agulhas Current dynamics and climate linkages.

Main Methods:

• Analysis of sea surface temperature (SST) and seawater oxygen isotope (δ18Osw) records.
• Development of a robust age model for the sediment core.
• Paleoclimate reconstruction using geochemical proxies.

Main Results:

• A continuous 270,000-year record of hydrographic variability (SST; δ18Osw) from the Agulhas Current.
• The dataset provides a solid age model for paleoclimate research.
• Demonstrates the Agulhas Current's significant role in regional and global climate dynamics.

Conclusions:

• The Agulhas Current system is a key driver of past climate variability.
• This record enables evaluation of Agulhas Current-AMOC linkages.
• Understanding past ocean heat transport is vital for Southern African climate and human evolution studies.