Lyle, Mitchell W; Mix, Alan C; Pisias, Nicklas G (2002): Calcium carbonate and stable isotope composition of sediment core RC13-110 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.845856, In supplement to: Lyle, MW et al. (2002): Patterns of CaCO3 deposition in the eastern tropical Pacific Ocean for the last 150 kyr: Evidence for a southeast Pacific depositional spike during marine isotope stage (MIS) 2. Paleoceanography, 17(2), 3-1-3-13, https://doi.org/10.1029/2000PA000538
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Abstract:
Stable isotopes in benthic foraminifera from Pacific sediments are used to assess hypotheses of systematic shifts in the depth distribution of oceanic nutrients and carbon during the ice ages. The carbon isotope differences between ~1400 and ~3200 m depth in the eastern Pacific are consistently greater in glacial than interglacial maxima over the last ~370 kyr. This phenomenon of "bottom heavy" glacial nutrient distributions, which Boyle proposed as a cause of Pleistocene CO2 change, occurs primarily in the 1/100 and 1/41 kyr**-1 "Milankovitch" orbital frequency bands but appears to lack a coherent 1/23 kyr**-1 band related to orbital precession. Averaged over oxygen-isotope stages, glacial delta13C gradients from ~1400 to ~3200 m depth are 0.1 per mil greater than interglacial gradients. The range of extreme shifts is somewhat larger, 0.2 to 0.5 per mil . In both cases, these changes in Pacific delta13C distributions are much smaller than observed in shorter records from the North Atlantic. This may be too small to be a dominant cause of atmospheric pCO2 change, unless current models underestimate the sensitivity of pCO2 to nutrient redistributions. This dampening of Pacific relative to Atlantic delta13C depth gradient favors a North Atlantic origin of the phenomenon, although local variations of Pacific intermediate water masses can not be excluded at present.
Related to:
Mix, Alan C; Pisias, Nicklas G; Zahn, Rainer; Rugh, W D; Lopez, Cody; Nelson, K (1991): Carbon 13 in Pacific deep and intermediate waters, 0-370 ka: implications for ocean circulation and Pleistocene CO2. Paleoceanography, 6(2), 205-226, https://doi.org/10.1029/90PA02303
Further details:
Mix, Alan C; Pisias, Nicklas G; Zahn, Rainer; Rugh, W D; Lopez, Cody; Nelson, K (1991): Stable isotope record of bentic foraminifera in sediment cores of the eastern Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.701404
Murray, David W (1987): Spatial and temporal variations in sediment accumulation in the central tropical Pacific. PhD thesis, Oregon State University, Corvallis, 343 pp
Coverage:
Latitude: -0.097000 * Longitude: -95.650000
Date/Time Start: 1970-04-26T00:00:00 * Date/Time End: 1970-04-26T00:00:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 15.51 m
Event(s):
RC13-110 * Latitude: -0.097000 * Longitude: -95.650000 * Date/Time: 1970-04-26T00:00:00 * Elevation: -3231.0 m * Recovery: 15.59 m * Campaign: RC13 * Basis: Robert Conrad * Method/Device: Piston corer (PC)
Comment:
CaCO3 by Pisias for this paper. Stable isotopes by Mix et al. (1991). For benthic isotopes see Mix et al. (1991).
Isotopic values were incorrectly transfered, values corrected on 2020-010-08.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Lyle, Mitchell W | Geocode | |
| 2 | AGE | Age | ka BP | Lyle, Mitchell W | Geocode | |
| 3 | Calcium carbonate | CaCO3 | % | Pisias, Nicklas G | ||
| 4 | Neogloboquadrina dutertrei, δ13C | N. dutertrei δ13C | ‰ PDB | Mix, Alan C | ||
| 5 | Neogloboquadrina dutertrei, δ18O | N. dutertrei δ18O | ‰ PDB | Mix, Alan C | ||
| 6 | Density, dry bulk | DBD | g/cm3 | Lyle, Mitchell W | Calculated | calculated by regression of Murray (1987) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
796 data points