Cléroux, Caroline; Cortijo, Elsa; Anand, Pallavi; Labeyrie, Laurent D; Bassinot, Franck C; Caillon, Nicolas; Duplessy, Jean-Claude (2008): Mg/Ca and Sr/Ca ratios of planktonic foraminifera from North Atlantic surface sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.832178, Supplement to: Cléroux, C et al. (2008): Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction. Paleoceanography, 23(3), PA3214, https://doi.org/10.1029/2007PA001505
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Abstract:
Reliable temperature estimates from both surface and subsurface ocean waters are needed to reconstruct past upper water column temperature gradients and past oceanic heat content. This work examines the relationships between trace element ratios in fossil shells and seawater temperature for surface-dwelling foraminifera species, Globigerinoides ruber (white) and Globigerina bulloides, and deep-dwelling species, Globorotalia inflata, Globorotalia truncatulinoides (dextral and sinistral) and Pulleniatina obliquiloculata. Mg/Ca and Sr/Ca ratios in shells picked in 29 modern core tops from the North Atlantic Ocean are calibrated using calculated isotopic temperatures. Mg/Ca ratios on G. ruber and G. bulloides agree with published data and relationships. For deep-dwelling species, Mg/Ca calibration follows the equation Mg/Ca = 0.78 (±0.04) * exp (0.051 (±0.003) * T) with a significant correlation coefficient of R**2 = 0.74. Moreover, there is no significant difference between the different deep-dwellers analyzed. For the Sr/Ca ratio, the surface dwellers and P. obliquiloculata do not record any temperature dependence. For the Globorotalia species, the thermo dependence of Sr/Ca ratio can be described by a single linear relationship: Sr/Ca = (0.0182 (±0.001) * T) + 1.097 (±0.018), R**2 = 0.85. Temperature estimates with a 1 sigma error of ±2.0°C and ±1.3°C can be derived from the Mg/Ca and Sr/Ca ratios, respectively, as long as the Sr geochemistry in the ocean has been constant through time.
Further details:
Cléroux, Caroline; Cortijo, Elsa; Duplessy, Jean-Claude; Zahn, Rainer (2007): Deep-dwelling foraminifera as thermocline temperature recorders. Geochemistry, Geophysics, Geosystems, 8(4), Q04N11, https://doi.org/10.1029/2006GC001474
Cléroux, Caroline; Cortijo, Elsa; Duplessy, Jean-Claude; Zahn, Rainer (2007): Stable isotope ratios of planktonic foraminifera from North Atlantic surface sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.832181
LeGrand, Allegra N; Schmidt, Gavin A (2006): Global gridded data set of the oxygen isotopic composition in seawater. Geophysical Research Letters, 33(12), L12604, https://doi.org/10.1029/2006GL026011
Coverage:
Median Latitude: 44.475549 * Median Longitude: -32.651022 * South-bound Latitude: 17.430000 * West-bound Longitude: -77.660000 * North-bound Latitude: 60.582167 * East-bound Longitude: -8.533833
Date/Time Start: 1977-11-17T00:00:00 * Date/Time End: 2003-05-31T23:30:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 0.55 m
Event(s):
CH69-K09 * Latitude: 41.760000 * Longitude: -47.350000 * Elevation: -4100.0 m * IGSN: BFBGX-111867 * Location: Newfoundland margin * Method/Device: Gravity corer (GC)
F1KR02 * Latitude: 58.080000 * Longitude: -10.720000 * Elevation: -2005.0 m * Campaign: FAEGAS * Method/Device: Grab (GRAB)
Comment:
Foraminiferal d18O data of all replicates can be find in auxiliary material from Cleroux et al. (2007), Seawater d18O data are from Legrande and Schmidt (2006) surface gridded data set.
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
755 data points