Planktonic Foraminiferal d13C Records from Southern Ocean Sediment Traps: New Estimates of the Oceanic Suess Effect

• Published in: Global Biogeochemical Cycles
• Other Authors: ALUDERS (custodian), Commonwealth of Australia (Geoscience Australia) (owner), Commonwealth of Australia (Geoscience Australia) (pointOfContact), EGD (hasAssociationWith), Howard, W. (author), King, A.L. (author), Manager Client Services (distributor), Manager Client Services (custodian)
• Format: Text
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: geoscientificInformation; External Publication; Scientific Journal Paper; marine; EARTH SCIENCES; Published_External; Pacific; Southern Ocean; Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://researchdata.edu.au/planktonic-foraminiferal-d13c-suess-effect/687587; https://pid.geoscience.gov.au/dataset/ga/70226; https://doi.org/10.1029/2003GB002162

Maintenance and Update Frequency: unknown Statement: Unknown The carbon isotopic composition is measured for three species of planktonic foraminifera (Globigerina bulloides, Globorotalia inflata and Neogloboquadrina pachyderma (s.)) from Southern Ocean sediment traps. The sediment traps represent the annual flux of foraminifera in Subtropical to Polar Frontal environments from the western Pacific/Southern Australia sector. Comparison between the seasonal d13C composition of the foraminifera and estimated d13C of dissolved inorganic carbon (DIC) allows disequilibrium effects to be determined. Disequilibrium exhibits a latitudinal trend, with greatest offsets from equilibrium at lower latitudes. This effect causes a north to south increase in foraminiferal d13C, while the d13CDIC displays a decrease across these latitudes. Disequilibrium in G. bulloides can be accounted for by changes in temperature. The relationship between disequilibrium and temperature which we derive in this field study is consistent with the laboratory relationship of Bemis et al. [2000] . Corrected d13C for G. bulloides is closely correlated to seasonal changes in nutrients at each site, indicating the utility of G. bulloides d13C as a nutrient tracer in Southern Ocean environments. Comparison between flux-weighted sediment trap values and nearby core tops indicates a modern depletion in d13C, which we attribute to the oceanic Suess effect. The imprint of this effect on the foraminiferal isotopes provides further evidence for the equilibration between surface waters and the atmosphere in the Subantarctic Zone.