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PALEOCEANOGRAPHY

Southeast Pacific SST Reconstruction

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Lamy, F., C. Rühlemann, D. Hebbeln, and G. Wefer. 2002. High- and low-latitude climate control on the position of the southern Peru-Chile Current during the Holocene. Paleoceanography 17(2):1028.
Data Coverage North: -41 * South: -41
West: -74.45 * East: -74.45
Altitude: -852 m

Start Year: 6170 14C yr BP * End Year: 195 14C yr BP

Data:     Please Cite Data Contributors!
  lamy2002
  gb3313-1-tab.txt

Summary:

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.
More Info on Paleoceanography Data

Parameters:

Iron, counts per second (measured by scanning XRF); Opal percent; delta O18 PDB; Sea Surface Temperature (C); Salinity; Organic Carbon weight percent; radiocarbon years before 1950AD

Complete XML Record:

noaa-ocean-2571  (Last Revised: 2007-12-21 )

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