Mg/Ca and Sr/Ca ratios of planktonic foraminifera from North Atlantic surface sediments, supplement to: Cléroux, Caroline; Cortijo, Elsa; Anand, Pallavi; Labeyrie, Laurent D; Bassinot, Franck C; Caillon, Nicolas; Duplessy, Jean Claude (2008): Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction. Paleoceanography, 23(3), PA3214

• Main Authors: Cléroux, Caroline, Cortijo, Elsa, Anand, Pallavi, Labeyrie, Laurent D, Bassinot, Franck C, Caillon, Nicolas, Duplessy, Jean Claude
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2008
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber white, Strontium/Calcium ratio; Globigerinoides ruber, δ18O; δ18O, water; Sea surface temperature, annual mean; Globigerina bulloides, Magnesium/Calcium ratio; Globigerina bulloides, Strontium/Calcium ratio; Globigerina bulloides, δ18O; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, Strontium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; Size fraction; Globorotalia inflata, Magnesium/Calcium ratio; Globorotalia inflata, Strontium/Calcium ratio; Globorotalia inflata, δ18O; Globorotalia truncatulinoides dextral, Magnesium/Calcium ratio; Globorotalia truncatulinoides dextral, Strontium/Calcium ratio; Globorotalia truncatulinoides dextral, δ18O; Globorotalia truncatulinoides sinistral, Magnesium/Calcium ratio; Globorotalia truncatulinoides sinistral, Strontium/Calcium ratio; Globorotalia truncatulinoides sinistral, δ18O; Gravity corer; Grab; Box corer; Piston corer; Calypso Corer; gridded; Calculated from stable oxygen isotopes; FAEGAS; INMD; MD132; MD101; MD114; PALEOCINAT; Melville; Marion Dufresne 1995; Le Suroît; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.832178; https://doi.pangaea.de/10.1594/PANGAEA.832178

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. : 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.