Winckler, Gisela; Anderson, Robert F; Schlosser, Peter (2005): (Table 1) Helium isotope ratios of sediment core TT013_114 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.835164, Supplement to: Winckler, G et al. (2005): Equatorial Pacific productivity and dust flux during the mid-Pleistocene climate transition. Paleoceanography, 20(4), PA4025, https://doi.org/10.1029/2005PA001177
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Abstract:
We present a helium isotope record for core TT013-114PC from the central equatorial Pacific (140°W, 4°N, 4432 m water depth) spanning a period of 1 million years. We focus on the time interval from 560 to 800 kyr, largely coinciding with the mid-Pleistocene climate transition (MPT) when the dominant period of the Earth's climate variability shifted from 41 kyr to 100 kyr. The terrigenous 4He concentrations from our study correlate very well with published titanium concentrations in this core strongly supporting the use of terrigenous 4He as a monitor of continental dust. Normalizing titanium and terrigenous 4He concentrations to 3He suggests that the dust supply during the MPT was approximately 30% lower compared to the subsequent period (560-100 kyr). The 3He-normalized barium, aluminum and phosphorus concentrations, trace elements with a predominantly biogenic source in these sediments, are relatively constant. This is in contrast to previous studies that reported an apparent rise of titanium-normalized productivity proxies. Rather than a significant increase in productivity during the MPT, we conclude that the dust flux to the central equatorial Pacific was reduced and that the export productivity was approximately constant during this period of climate reorganization.
Further details:
Clarke, W B; Jenkins, William J; Top, Zafer (1976): Determination of tritium by mass spectrometric measurement of 3He. Applied Radiation and Isotopes, 27(9), 515-522, https://doi.org/10.1016/0020-708X(76)90082-X
Coverage:
Latitude: 4.043300 * Longitude: -139.850800
Date/Time Start: 1992-11-29T12:31:00 * Date/Time End: 1992-11-29T12:31:00
Minimum DEPTH, sediment/rock: 0.20 m * Maximum DEPTH, sediment/rock: 7.75 m
Event(s):
TT013_114 (11291231 Pistoncore13) * Latitude: 4.043300 * Longitude: -139.850800 * Date/Time: 1992-11-29T12:31:00 * Elevation: -4432.0 m * Location: Equatorial Pacific * Campaign: TT013 * Basis: Thomas G. Thompson * Method/Device: Piston corer (PC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Helium-3 | 3He | 10-10 cm3/g | Winckler, Gisela | Isotope ratio mass spectrometry | |
| 4 | Helium-3, standard deviation | 3He std dev | ± | Winckler, Gisela | Isotope ratio mass spectrometry | |
| 5 | Helium-3/Helium-4 | 3He/4He | 10-4 | Winckler, Gisela | Normalized | normalized to the atmospheric ratio (Ra = 1.384 * 10**-6) (Clarke et al., 1976) |
| 6 | Helium-3/Helium-4, standard deviation | 3He/4He std dev | ± | Winckler, Gisela | Normalized | normalized to the atmospheric ratio (Ra = 1.384 * 10**-6) (Clarke et al., 1976) |
| 7 | Helium-4, terrestrial | 4He terr | 10-9 cm3/g | Winckler, Gisela | Isotope ratio mass spectrometry | represents the terrigenous fraction of 4He |
| 8 | Helium-4, terrestrial, standard deviation | 4He terr std dev | ± | Winckler, Gisela | Isotope ratio mass spectrometry | represents the terrigenous fraction of 4He |
| 9 | Comment | Comment | Winckler, Gisela | duplicate samples, average values are reported |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
225 data points