Data Description

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Citation:
Mohtadi, M et al. (2010): A multi-proxy investigation of sediment core GeoB7165-1 and AMS 14C dating points from sediment cores off Conceptión (~ 36°S). doi:10.1594/PANGAEA.733253,
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, doi:10.1016/j.epsl.2008.04.043
Abstract:
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.
Project(s):
Coverage:
Median Latitude: -34.078277 * Median Longitude: -72.708027 * South-bound Latitude: -36.542330 * West-bound Longitude: -73.666500 * North-bound Latitude: -30.200000 * East-bound Longitude: -71.983500
Minimum Age: 6.520 ka BP * Maximum Age: 22.280 ka BP
Event(s):
GIK17748-2 (SO80-4) * * Latitude: -32.750000 * Longitude: -72.033330 * Date/Time: 1992-06-12T08:35:00 * Elevation: -2545.0 m * Recovery: 3.86 m * Penetration: 4.00 m * Location: East Pacific * * Campaign: SO80a (HOTLINE, HYGAPE) * * Basis: Sonne * * Device: Gravity corer (Kiel type) *
GeoB3302-1 * * Latitude: -33.218333 * Longitude: -72.090000 * Date/Time: 1995-04-26T00:00:00 * Elevation: -1498.0 m * Recovery: 4.12 m * Location: South-East Pacific * * Campaign: SO101 (CONDOR-Ia) * * Basis: Sonne * * Device: Gravity corer (Kiel type) *
GeoB3359-3 * * Latitude: -35.216667 * Longitude: -72.808333 * Date/Time: 1995-05-31T00:00:00 * Elevation: -678.0 m * Recovery: 3.80 m * Location: South-East Pacific * * Campaign: SO102/1 (CHIPAL) * * Basis: Sonne * * Device: Gravity corer (Kiel type) *
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