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Anand, Pallavi; Elderfield, Henry; Conte, Maureen H (2003): Mg/Ca and δ¹⁸O measurements of planktonic foraminifera from Sargasso Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.740070, Supplement to: Anand, P et al. (2003): Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography, 18(2), 1050, https://doi.org/10.1029/2002PA000846

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Abstract:
Paired Mg/Ca and d18O measurements on planktonic foraminiferal species (G. ruber white, G. ruber pink, G. sacculifer, G. conglobatus, G. aequilateralis, O. universa, N. dutertrei, P. obliquiloculata, G. inflata, G. truncatulinoides, G. hirsuta, and G. crassaformis) from a 6-year sediment trap time series in the Sargasso Sea were used to define the sensitivity of foraminiferal Mg/Ca to calcification temperature. Habitat depths and calcification temperatures were estimated from comparison of d18O of foraminifera with equilibrium calcite, based on historical temperature and salinity data. When considered together, Mg/Ca (mmol/mol) of all species, except two, show a significant (r = 0.93) relationship with temperature (T °C) of the form Mg/Ca = 0.38 (±0.02) exp 0.090 (±0.003)T, equivalent to a 9.0 ± 0.3% change in Mg/Ca for a 1°C change in temperature. Small differences exist in calibrations between species and between different size fractions of the same species. O. universa and G. aequilateralis have higher Mg/Ca than other species, and in general, data can be best described with the same temperature sensitivity for all species and pre-exponential constants in the sequence O. universa > G. aequilateralis = G. bulloides > G. ruber = G. sacculifer = other species. This approach gives an accuracy of ±1.2°C in the estimation of calcification temperature. The 9% sensitivity to temperature is similar to published studies from culture and core top calibrations, but differences exist from some literature values of pre-exponential constants. Different cleaning methodologies and artefacts of core top dissolution are probably implicated, and perhaps environmental factors yet understood. Planktonic foraminiferal Mg/Ca temperature estimates can be used for reconstructing surface temperatures and mixed and thermocline temperatures (using G. ruber pink, G. ruber white, G. sacculifer, N. dutertrei, P. obliquiloculata, etc.). The existence of a single Mg thermometry equation is valuable for extinct species, although use of species-specific equations will, where statistically significant, provide more accurate evaluation of Mg/Ca paleotemperature.
Coverage:
Latitude: 32.090000 * Longitude: -64.256700
Date/Time Start: 1978-05-01T00:00:00 * Date/Time End: 1984-12-01T00:00:00
Event(s):
SCIFF_site * Latitude: 32.090000 * Longitude: -64.256700 * Location: Sargasso Sea * Method/Device: Trap, sediment (TRAPS) * Comment: Seasonal Change in Isotopes and Flux of Foraminifera (SCIFF)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeGeocode
2Foraminifera, planktic, size minimumForam plankt size minµmAnand, PallaviCounting
3Foraminifera, planktic, size maximumForam plankt size maxµmAnand, PallaviCounting
4Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)pink
5Globigerinoides ruber, δ18OG. ruber δ18O‰ PDBAnand, Pallavipink
6Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)white
7Globigerinoides ruber, δ18OG. ruber δ18O‰ PDBAnand, Pallaviwhite
8Globigerinoides sacculifer, Magnesium/Calcium ratioG. sacculifer Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)without sac
9Globigerinoides sacculifer, δ18OG. sacculifer δ18O‰ PDBAnand, Pallavi
10Globigerinoides sacculifer, Magnesium/Calcium ratioG. sacculifer Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)with sac
11Globigerinoides sacculifer sac, δ18OG. sacculifer sac δ18O‰ PDBAnand, Pallavi
12Pulleniatina obliquiloculata, Magnesium/Calcium ratioP. obliqu. Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
13Pulleniatina obliquiloculata, δ18OP. obliqu. δ18O‰ PDBAnand, Pallavi
14Neogloboquadrina dutertrei, Magnesium/Calcium ratioN. dutertrei Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
15Neogloboquadrina dutertrei, δ18ON. dutertrei δ18O‰ PDBAnand, Pallavi
16Globigerinoides conglobatus, Magnesium/Calcium ratioG. conglobatus Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
17Globigerinoides conglobatus, δ18OG. conglobatus δ18O‰ PDBAnand, Pallavi
18Globorotalia inflata, Magnesium/Calcium ratioG. inflata Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
19Globorotalia inflata, δ18OG. inflata δ18O‰ PDBAnand, Pallavi
20Globorotalia truncatulinoides, Magnesium/Calcium ratioG. truncatulinoides Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
21Globorotalia truncatulinoides, δ18OG. truncatulinoides δ18O‰ PDBAnand, Pallavi
22Globorotalia hirsuta, Magnesium/Calcium ratioG. hirsuta Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
23Globorotalia hirsuta, δ18OG. hirsuta δ18O‰ PDBAnand, Pallavi
24Globorotalia crassaformis, Magnesium/Calcium ratioG. crassaformis Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
25Globorotalia crassaformis, δ18OG. crassaf. δ18O‰ PDBAnand, Pallavi
26Orbulina universa, Magnesium/Calcium ratioO. universa Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)thin test
27Orbulina universa, δ18OO. universa δ18O‰ PDBAnand, Pallavithin test
28Orbulina universa, Magnesium/Calcium ratioO. universa Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)thick test
29Orbulina universa, δ18OO. universa δ18O‰ PDBAnand, Pallavithick test
30Globigerinella aequilateralis, Magnesium/Calcium ratioG. aequilateralis Mg/Cammol/molAnand, PallaviAtomic emission spectroscopy (AES)
31Globigerinella aequilateralis, δ18OG. aequilateralis δ18O‰ PDBAnand, Pallavi
Size:
1324 data points

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