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

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 an...

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Bibliographic Details
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: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
Center for Marine Environmental Sciences
CHIPAL
CONDOR-Ia
East Pacific
GeoB3302-1
GeoB3359-3
GeoB7139-2
GeoB7165-1
GIK17748-2
Gravity corer (Kiel type)
HOTLINE
HYGAPE
MARUM
off Chile
PUCK
SL
SO101
SO101/3_2-1
SO102/1
SO156/2
SO156/3
SO80_4
SO80a
Sonne
South-East Pacific
Antarctic
Pacific
The Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.733253
https://doi.org/10.1594/PANGAEA.733253
Description
Summary: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 the Southern Westerlies were located further north, productivity off central-south Chile, in contrast to off northern Chile, was reduced due to direct onshore-blowing winds that prevented coastal upwelling and export production.

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