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Detailed Reference Information |
Lamy, F., Rühlemann, C., Hebbeln, D. and Wefer, G. (2002). High- and low-latitude climate control on the position of the southern Peru-Chile Current during the Holocene. Paleoceanography 17. doi: 10.1029/2001PA000727. issn: 0883-8305. |
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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. |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Paleoclimatology, Oceanography, General, Paleoceanography, Information Related to Geographic Region, Pacific Ocean, Geochemistry, Marine geochemistry (4835, 4850), Geochemistry, Isotopic composition/chemistry |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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