Driving Mechanisms Behind Productivity Changes in the Pacific Antarctic Zone since MIS 8

Understanding shifts in paleoproductivity within the Antarctic Zone (AZ) is pivotal for deciphering climate change dynamics. To enhance our comprehension of the mechanisms underlying productivity variations in this region, we present an extensive set of multi-proxy records from gravity core ANT36/A3-08 (LATITUDE: -69.02 and LONGITUDE: -120.06), retrieved from the southernmost upwelling boundary of the modern Circumpolar Deep Water in the Amundsen Sea.

These records encompass productivity proxies, including Ti-normalized bromine (Br/Ti), biogenic silicon (opal/Ti), total organic carbon (TOC/Ti), total nitrogen (TN/Ti) ratios, and calcium carbonate (CaCO3) content, as well as local bottom hydrodynamics indicators, such as mean sortable silt, sortable silt percentage (SS%), and zirconium/rubidium (Zr/Rb) ratios. Additionally, changes in hydrodynamic conditions are further constrained by terrigenous input proxies, including Ti, aluminum (Al), iron (Fe), and potassium (K) versus calcium (Ca) ratios.