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Rathmann, Söhnke; Hess, Silvia; Kuhnert, Henning; Mulitza, Stefan (2004): Magnesium/calcium ratio of the foraminifera Oridorsalis umbonatus in surface sediment samples off Namibia. PANGAEA, https://doi.org/10.1594/PANGAEA.726732, Supplement to: Rathmann, S et al. (2004): Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus obtained by laser ablation from core top sediments: Relationship to bottom water temperatures. Geochemistry, Geophysics, Geosystems, 5(12), Q12013, https://doi.org/10.1029/2004GC000808

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Abstract:
A laser ablation system connected to an inductively coupled plasma mass spectrometer was used to determine Mg/Ca ratios of the benthic foraminifera Oridorsalis umbonatus. A set of modern core top samples collected along a depth transect on the continental slope off Namibia (320-2300 m water depth; 2.9° to 10.4°C) was used to calibrate the Mg/Ca ratio against bottom water temperature. The resulting Mg/Ca-bottom water temperature relationship of O. umbonatus is described by the exponential equation Mg/Ca = 1.528*e**0.09*BWT. The temperature sensitivity of this equation is similar to previously published calibrations based on Cibicidoides species, suggesting that the Mg/Ca ratio of O. umbonatus is a valuable proxy for thermocline and deep water temperature.
Coverage:
Median Latitude: -25.295278 * Median Longitude: 13.445556 * South-bound Latitude: -25.610000 * West-bound Longitude: 12.935000 * North-bound Latitude: -24.251667 * East-bound Longitude: 13.686667
Date/Time Start: 2003-02-12T00:00:00 * Date/Time End: 2003-02-27T00:00:00
Event(s):
GeoB8403-1 * Latitude: -24.251667 * Longitude: 13.611667 * Date/Time: 2003-02-12T00:00:00 * Elevation: -320.0 m * Recovery: 0.34 m * Location: Walvis Bay/Namibia * Campaign: M57/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC)
GeoB8430-2 * Latitude: -25.610000 * Longitude: 13.280000 * Date/Time: 2003-02-20T00:00:00 * Elevation: -1330.0 m * Location: Walvis Bay/Namibia * Campaign: M57/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC)
GeoB8449-1 * Latitude: -25.475000 * Longitude: 13.553333 * Date/Time: 2003-02-23T00:00:00 * Elevation: -605.0 m * Location: Walvis Bay/Namibia * Campaign: M57/2 * Basis: Meteor (1986) * Device: MultiCorer (MUC)
Size:
6 datasets

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