Temperature and salinity reconstruction for sediment core GeoB3313-1

• Main Authors: Lamy, Frank, Rühlemann, Carsten, Hebbeln, Dierk, Wefer, Gerold
• Format: Dataset
• Language: English
• Published: PANGAEA 2002
• Subjects: CHIPAL; GeoB; GeoB3313-1; Geosciences; University of Bremen; GHOST; Gravity corer (Kiel type); SL; SO102/1; Sonne; South-East Pacific; Antarctic; The Antarctic; Pacific; Antarc*; Antarctica
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.735166; https://doi.org/10.1594/PANGAEA.735166

We reconstructed changes of temperature, salinity, and productivity within the southern Peru-Chile Current during the last 8000 years from a high-resolution sediment core recovered at 41°S using alkenones, isotope ratios of planktic foraminifera, biogenic opal, and organic carbon. Paleotemperatures and paleosalinities reached maximum values at ~5500 years ago and thereafter declined to modern values, whereas paleoproductivity continuously increased throughout the last 8000 years. We ascribe these long-term Holocene trends primarily to latitudinal shifts of the Antarctic Circumpolar Current (ACC). The concurrence with shifts in the position of the Southern Westerlies points to a common response of atmospheric and oceanographic circulation patterns off southern Chile. Millennial- to centennial-scale fluctuations of paleotemperatures and paleosalinities, on the other hand, lag displacements in the position of the Southern Westerlies but reveal a significant correlation to short-term temperature changes in Antarctica, indicating a high-latitude control of the ACC at these timescales.