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  • 143-865B; 207-1258A; 207-1258B; 207-1258C; 207-1260A; 342-U1407A; 342-U1409B; 342-U1409C; AGE; Aluminium/Calcium ratio; Atmospheric CO2; Carbon dioxide; Carbon dioxide, standard deviation; climate sensitivity; Comment; Core; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Eocene; Event label; Exp342; Foraminifera, planktic δ11B; GMT; Hole; Joides Resolution; Leg143; Leg207; Magnesium/Calcium ratio; North Pacific Ocean; Paleogene Newfoundland Sediment Drifts; pH; pH, standard deviation; Sea surface temperature; Section; Site; Size fraction; South Atlantic Ocean; Species; surface seawater pH; δ11B, standard deviation  (1)
  • paleoclimate  (1)
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  • 1
    Publikationsdatum: 2023-09-25
    Beschreibung: This dataset includes measurements on mixed layer planktonic foraminifera from IODP/ODP sites for boron isotopes and trace elements. Boron isotopes were measured after column chemistry and solution analyses on a Neptune multi collector ICPMS, while trace elements were measured on pre-columned aliquots of the same samples, using Element XR ICP-MS. Furthermore, the dataset includes the seawater pH and atmospheric CO2 calculated from B isotopes measurements and Mg/Ca-temperature estimates, for no-vital effect treatment (T. sac-vital effect corrections at Eocene d11Bsw conditions result in d11B offsets within analytical uncertainty), and no pH correction on Mg/Ca-temperature relationship (assuming T. sac like species). Carbonate system calculations incorporate MyAMI ion-pairing corrections (https://github.com/MathisHain/MyAMI), and surface Omega values specific for the Eocene and the paleo-latitude of the core location. Propagation of uncertainties for pH and CO2 is completed through 1000 Monte Carlo simulations.
    Schlagwort(e): 143-865B; 207-1258A; 207-1258B; 207-1258C; 207-1260A; 342-U1407A; 342-U1409B; 342-U1409C; AGE; Aluminium/Calcium ratio; Atmospheric CO2; Carbon dioxide; Carbon dioxide, standard deviation; climate sensitivity; Comment; Core; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Eocene; Event label; Exp342; Foraminifera, planktic δ11B; GMT; Hole; Joides Resolution; Leg143; Leg207; Magnesium/Calcium ratio; North Pacific Ocean; Paleogene Newfoundland Sediment Drifts; pH; pH, standard deviation; Sea surface temperature; Section; Site; Size fraction; South Atlantic Ocean; Species; surface seawater pH; δ11B, standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 1239 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Publikationsdatum: 2021-10-15
    Beschreibung: The Middle Eocene Climatic Optimum (MECO) was a gradual warming event and carbon cycle perturbation that occurred between 40.5 and 40.1 Ma. A number of characteristics, including greater-than-expected deep-sea carbonate dissolution, a lack of globally coherent negative δ13C excursion in marine carbonates, a duration longer than the characteristic timescale of carbon cycle recovery, and the absence of a clear trigger mechanism, challenge our current understanding of the Earth system and its regulatory feedbacks. This makes the MECO one of the most enigmatic events in the Cenozoic, dubbed a middle Eocene “carbon cycle conundrum.” Here we use boron isotopes in planktic foraminifera to better constrain pCO2 changes over the event. Over the MECO itself, we find that pCO2 rose by only 0.55–0.75 doublings, thus requiring a much more modest carbon injection than previously indicated by the alkenone δ13C-pCO2 proxy. In addition, this rise in pCO2 was focused around the peak of the 400 kyr warming trend. Before this, considerable global carbonate δ18O change was asynchronous with any coherent ocean pH (and hence pCO2) excursion. This finding suggests that middle Eocene climate (and perhaps a nascent cryosphere) was highly sensitive to small changes in radiative forcing.
    Schlagwort(e): 551 ; boron isotopes ; pCO2 reconstruction ; Middle Eocene Climatic Optimum ; carbon cycle ; paleoclimate ; cryosphere
    Sprache: Englisch
    Materialart: map
    Standort Signatur Einschränkungen Verfügbarkeit
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