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Curry, William B; Crowley, Thomas J (1987): Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.692012, Supplement to: McIntyre, Andrew; Ruddiman, William F; Karlin, K; Mix, Alan C (1989): Surface water response of the Equatorial Atlantic Ocean to orbital forcing. Paleoceanography, 4(1), 19-55, https://doi.org/10.1029/PA004i001p00019

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Abstract:
Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial and tropical Atlantic Ocean. We have produced a composite, stacked Globigerinoides sacculifer delta13C record from the equatorial Atlantic, which exhibits significant spectral power at the 100,000- and 41,000-year Milankovitch periods, but no power at the 23,000-year period. Similar to the record presented by Shackleton and Pisias [1985], surface-deep ocean Delta delta13C produced with the G. sacculifer record leads the delta18O ice volume record. However, the glacial-interglacial amplitudes of Delta delta13C differ between our record and Shackleton and Pisias [1985] record. Although large changes in Delta delta13C occur in the equatorial Atlantic during early stages of the last three glacial cycles, surface-deep Delta delta13C at glacial maxima (18O stage 2, late stage 6, and late stage 8) was only about 0.2‰ greater than during the subsequent interglacial. Our results imply that nutrient-driven pCO2 changes account for about one third of the pCO2 decrease observed in ice cores, and consequently, Delta delta13C should not be used as a proxy pCO2 index. Enough variance in the ice core pCO2 records remains to be explained that conclusions about pCO2 and ice volume phase relationships should also be reexamined. As much as 40 ppm pCO2 change still has not been accounted for by models of past physics and chemistry of the ocean.
Related to:
Curry, William B; Crowley, Thomas J (1987): The d13C of equatorial Atlantic surface waters: implications for ice age pCO2 levels. Paleoceanography, 2(5), 489-517, https://doi.org/10.1029/PA002i005p00489
Imbrie, John D; McIntyre, Andrew; Mix, Alan C (1989): Oceanic response to orbital forcing in the late Quaternary: observational and experimental strategies. In: Berger, A; Schneider, S H & Duplessy, J C (eds.), Climate and Geosciences, A Challenge for Science and Society in the 21th Century. Boston (Kluwer Academic), 121-164, https://doi.org/10.1007/978-94-009-2446-8_7
Coverage:
Median Latitude: 12.019257 * Median Longitude: -39.230410 * South-bound Latitude: 4.337000 * West-bound Longitude: -79.378200 * North-bound Latitude: 26.400000 * East-bound Longitude: -19.851667
Date/Time Start: 1968-01-21T00:00:00 * Date/Time End: 1984-11-08T00:00:00
Event(s):
68-502B * Latitude: 11.491800 * Longitude: -79.378200 * Date/Time: 1979-08-16T00:00:00 * Elevation: -3051.0 m * Penetration: 99.7 m * Recovery: 87.7 m * Location: Caribbean Sea/RIDGE * Campaign: Leg68 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 99.7 m cored; 0 m drilled; 88 % recovery
Curry_crowley_stack * Device: Calculation (INT)
EN066-38PG (0038PG) * Latitude: 4.918000 * Longitude: -20.498000 * Date/Time: 1981-05-31T00:00:00 * Elevation: -2937.0 m * Campaign: EN06601 * Basis: Endeavor * Device: Gravity corer (GC)
Size:
10 datasets

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Datasets listed in this publication series

  1. Curry, WB; Crowley, TJ (1987): (Table 2a) Stable isotope ratios of planktonic foraminifera from sediment core EN066-38PG in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.357329
  2. Curry, WB; Crowley, TJ (1987): (Table 2b) Stable isotope ratios of Globigerinoides sacculifer from sediment core KN11002-0043 in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59889
  3. Curry, WB; Crowley, TJ (1987): (Table 2c) Stable isotope ratios of Globigerinoides sacculifer from sediment core KN11002-82GGC in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59890
  4. Curry, WB; Crowley, TJ (1987): (Table 2d, specmap.007) Stable isotope ratios measured on planktonic foraminifer Globigerinoides ruber from sediment core V25-21. https://doi.org/10.1594/PANGAEA.59891
  5. Curry, WB; Crowley, TJ (1987): (Table 3) Age model of DSDP Hole 68-506B in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59900
  6. Curry, WB; Crowley, TJ (1987): (Table 3) Age model of sediment core EN066-38PG in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.357175
  7. Curry, WB; Crowley, TJ (1987): (Table 3) Age model of sediment core GIK13519-1 in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59895
  8. Curry, WB; Crowley, TJ (1987): (Table 3) Age model of sediment core KN11002-0043 in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59897
  9. Curry, WB; Crowley, TJ (1987): (Table 3) Age model of sediment core V25-21 in the equatorial Atlantic. https://doi.org/10.1594/PANGAEA.59899
  10. Curry, WB; Crowley, TJ (1987): (Table 5) Stacked records of stable carbon and oxygen isotopes for Equatorial Atlantic Globigerinoides sacculifer. https://doi.org/10.1594/PANGAEA.59901