Lamy, F et al. (2002): Temperature and salinity reconstruction for sediment core GeoB3313-1. doi:10.1594/PANGAEA.735166, Supplement to:Lamy, Frank; Rühlemann, Carsten; Hebbeln, Dierk; Wefer, Gerold (2002): High- and low-latitude climate control on the position of the southern Peru-Chile Current during the Holocene. Paleoceanography, 17(2), 1028, doi:10.1029/2001PA000727
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.