|High- and low-latitude climate control on the position of the southern Peru-Chile Current during the Holocene.|
High- and low-latitude climate control on the position of the southern
Peru-Chile Current during the Holocene. |
v.17, No. 3, 10.1029/2001PA000727, 2002.
Lamy, F., C. Rühlemann, D. Hebbeln, and G. Wefer
We reconstructed changes of temperature, salinity, and productivity within the southern Peru-Chile Current during the last 8,000 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 8,000 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.
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It was published in Paleoceanography, v.17 No. 3, 2002
National Oceanic and Atmospheric Administration
05 July 2002