A multi-proxy investigation of sediment core GeoB7165-1 and AMS 14C dating points from sediment cores off Conceptión (~ 36°S) ...

• Main Authors: Mohtadi, Mahyar, Rossel, Pamela E, Lange, Carina Beatriz, Pantoja, Silvio, Böning, Philipp, Repeta, Daniel J, Grunwald, Maik, Lamy, Frank, Hebbeln, Dierk, Brumsack, Hans-Jürgen
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Gravity corer Kiel type; SO101; SO102/1; SO156/2; SO156/3; SO80a; Sonne; Center for Marine Environmental Sciences MARUM; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.733253; https://doi.pangaea.de/10.1594/PANGAEA.733253

A high-resolution sea surface temperature and paleoproductivity reconstruction on a sedimentary record collected at 36°S off central-south Chile (GeoB 7165-1, 36°33'S, 73°40'W, 797 m water depth, core length 750 cm) indicates that paleoceanographic conditions changed abruptly between 18 and 17 ka. Comparative analysis of several cores along the Chilean continental margin (30°-41°S) suggests that the onset and the pattern of deglacial warming was not uniform off central-south Chile due to the progressive southward migration of the Southern Westerlies and local variations in upwelling. Marine productivity augmented rather abruptly at 13-14 ka, well after the oceanographic changes.We suggest that the late deglacial increase in paleoproductivity off central-south Chile reflects the onset of an active upwelling system bringing nutrient-rich, oxygen-poor Equatorial SubsurfaceWater to the euphotic zone, and a relatively higher nutrient load of the Antarctic Circumpolar Current. During the Last Glacial Maximum, when ... : Supplement to: Mohtadi, Mahyar; Rossel, Pamela E; Lange, Carina Beatriz; Pantoja, Silvio; Böning, Philipp; Repeta, Daniel J; Grunwald, Maik; Lamy, Frank; Hebbeln, Dierk; Brumsack, Hans-Jürgen (2008): Deglacial pattern of circulation and marine productivity in the upwelling region off central-south Chile. Earth and Planetary Science Letters, 272, 221-230 ...