FN Archimer Export Format
PT J
TI Mg/Ca thermometry in planktic foraminifera: Improving paleotemperature estimations for     G. bulloides     and     N. pachyderma     left
BT 
AF RIVEIROS, Natalia Vazquez
   GOVIN, Aline
   WAELBROECK, Claire
   MACKENSEN, Andreas
   MICHEL, Elisabeth
   MOREIRA, Santiago
   BOUINOT, Thomas
   CAILLON, Nicolas
   ORGUN, Ayche
   BRANDON, Margaux
AS 1:1;2:1;3:1;4:2;5:1;6:1;7:1;8:1,3,4;9:1;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Univ Paris Saclay, UVSQ, CEA, LSCE,IPSL,CNRS, Gif Sur Yvette, France.
   Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Bremerhaven, Germany.
   Univ Grenoble Alpes, Lab Glaciol & Geophys Environm, Grenoble, France.
   CNRS, Lab Glaciol & Geophys Environm, Grenoble, France.
C2 UNIV PARIS SACLAY, FRANCE
   INST A WEGENER, GERMANY
   UNIV GRENOBLE ALPES, FRANCE
   CNRS, FRANCE
IF 3.201
TC 24
UR https://archimer.ifremer.fr/doc/00324/43480/42916.pdf
   https://archimer.ifremer.fr/doc/00324/43480/42917.docx
   https://archimer.ifremer.fr/doc/00324/43480/42918.xls
   https://archimer.ifremer.fr/doc/00324/43480/42919.xls
LA English
DT Article
CR APSARA 2/ANTIPROD 3-MD 38
   MD 189 / INDIEN SUD 2
BO Marion Dufresne
AB Planktic foraminiferal Mg/Ca ratios have become a fundamental seawater temperature proxy in past climate reconstructions, due to the temperature dependence of Mg uptake into foraminiferal calcite. However, empirical calibrations for single species from methodologically consistent data are still lacking. Here we present species-specific calibrations of Mg/Ca versus calcification temperature for two commonly used species of planktic foraminifera: Globigerina bulloides and Neogloboquadrina pachyderma left, based on a series of Southern Ocean and North Atlantic core tops. Combining these new data with previously published data, we derive an integrated G. bulloides Mg/Ca-temperature calibration for mid and high latitudes of both hemispheres between 2 and 18°C, where Mg/Ca = 1.006 ± 0.032 * e0.065 ± 0.003*Tiso (R2 = 0.82). G. bulloides is found to calcify deeper in the Southern Ocean (∼ 200 m) than in the North Atlantic (top 50 m). We also propose a Mg/Ca temperature calibration to describe the temperature response in N. pachyderma left that calcified away from the influence of sea ice in the Southern Ocean, valid between ∼ −1 and 9°C, of the form Mg/Ca = 0.580 ± 0.016 * e0.084 ± 0.006*Tiso (R2 = 0.70). These calibrations account for uncertainties on Mg/Ca measurements and calcification temperature that were carefully estimated and propagated using Monte Carlo iterations. The 1σ propagated error in Mg/Ca-derived temperatures is 1.1°C for G. bulloides and 0.9°C for N. pachyderma left for the presented data sets. Geographical extension of genotypes must be assessed when choosing to develop regional or global calibrations.
PY 2016
PD APR
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 17
IS 4
UT 000379523900001
BP 1249
EP 1264
DI 10.1002/2015GC006234
ID 43480
ER

EF