Starr, Aidan; Hall, Ian R: Agulhas Plateau Composite Pleistocene grain size and stable isotope measurements [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.972825 (dataset in review)
Abstract:
Reconstructions of near-bottom flow speed and vertical stable carbon isotope gradient since 1.9 myr ago from the Agulhas Plateau Composite deep sea sediment core site. Measurements of Sortable Silt mean grain size (10-63 µm, CaCO3 and opal removed) made with a Beckman-Coulter Mastersizer 4e Coulter Counter at Cardiff University. Stable isotopes (18O and 13C measured on planktic foraminifera species G. truncatulinoides (n = 3 to 15 shells per sample). Isotope measurements are paired with previously published benthic d18O and d13C data from the sample site.
Keyword(s):
Supplement to:
Starr, Aidan; Hall, Ian R (in review): Shifting Antarctic Circumpolar Current south of Africa over the past 1.9 million years, in review at Science Advances. Science Advances
Related to:
Expedition 361 Science Party; Starr, Aidan; Hall, Ian R; Barker, Stephen; Rackow, Thomas; Zhang, Xu; Hemming, Sidney R; van der Lubbe, H J L; Knorr, Gregor; Berke, Melissa A; Bigg, Grant R; Cartagena-Sierra, Alejandra; Jiménez-Espejo, Francisco Jose; Gong, Xun; Gruetzner, Jens; Lathika, Nambiyathodi; LeVay, Leah J; Robinson, Rebecca S; Ziegler, Martin (2021): Antarctic icebergs reorganize ocean circulation during Pleistocene glacials. Nature, 589(7841), 236-241, https://doi.org/10.1038/s41586-020-03094-7
Ziegler, Martin; Diz, Paula; Hall, Ian R; Zahn, Rainer (2013): Millennial-scale changes in atmospheric CO2 levels linked to the Southern Ocean carbon isotope gradient and dust flux. Nature Geoscience, 6(6), 457-461, https://doi.org/10.1038/ngeo1782
Coverage:
Median Latitude: -41.381600 * Median Longitude: 25.308600 * South-bound Latitude: -41.427000 * West-bound Longitude: 25.260000 * North-bound Latitude: -41.200000 * East-bound Longitude: 25.500000
Date/Time Start: 2002-10-01T00:00:00 * Date/Time End: 2016-02-27T04:15:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 47.800 m
Event(s):
361-U1475B * Latitude: -41.427000 * Longitude: 25.261000 * Date/Time: 2016-02-24T01:55:00 * Elevation: -2680.5 m * Penetration: 243.9 m * Recovery: 250.31 m * Campaign: Exp361 (South African Climates (Agulhas LGM Density Profile)) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores, 0 m drilled, 103% recovery
361-U1475C * Latitude: -41.427000 * Longitude: 25.261000 * Date/Time: 2016-02-25T04:55:00 * Elevation: -2680.4 m * Penetration: 275 m * Recovery: 280.7 m * Campaign: Exp361 (South African Climates (Agulhas LGM Density Profile)) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores, 3 m drilled, 103% recovery
361-U1475E * Latitude: -41.427000 * Longitude: 25.261000 * Date/Time: 2016-02-27T04:15:00 * Elevation: -2682.9 m * Penetration: 277 m * Recovery: 277.2 m * Campaign: Exp361 (South African Climates (Agulhas LGM Density Profile)) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores, 6.5 m drilled, 102% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Starr, Aidan | |||
| 2 | Latitude of event | Latitude | Starr, Aidan | |||
| 3 | Longitude of event | Longitude | Starr, Aidan | |||
| 4 | Date/Time of event | Date/Time | Starr, Aidan | |||
| 5 | Sample ID | Sample ID | Starr, Aidan | |||
| 6 | DEPTH, sediment/rock | Depth sed | m | Starr, Aidan | Geocode – Stratigraphic depth of each sample given on the orgiinal core scale (rather than the composite "spliced" scale refered to as the Agulhas Plateau Composite or APcomp) | |
| 7 | Depth, composite | Depth comp | mcd | Starr, Aidan | Stratigraphic depth of each sample on the "spliced" composite depth scale (Agulhas Plateau Composite). Created by combining the MD02-2588 and Site 361-U1475 depth scales at the point where they are spliced. | |
| 8 | AGE | Age | ka BP | Starr, Aidan | Age model according to Lisiecki & Raymo (2005) [LR04] | Geocode – Sample age in thousand years (ka) according to the LR04 timescale publisbed by Starr et al. (2021, doi:10.1038/s41586-020-03094-7) for the Agulhas Plateau composite. |
| 9 | Cibicides wuellerstorfi, δ18O | C. wuellerstorfi δ18O | ‰ PDB | Starr, Aidan | see comment | vs. VPDB. MD02-2588 from Ziegler et al. (2013, doi:10.1038/ngeo1782). Site 361-U1475 from Starr et al. (2021, doi:10.1038/s41586-020-03094-7). |
| 10 | Cibicides wuellerstorfi, δ13C | C. wuellerstorfi δ13C | ‰ PDB | Starr, Aidan | see comment | vs. VPDB. MD02-2588 from Ziegler et al. (2013, doi:10.1038/ngeo1782). Site 361-U1475 from Starr et al. (2021, doi:10.1038/s41586-020-03094-7). |
| 11 | Globorotalia truncatulinoides | G. truncatulinoides | # | Starr, Aidan | see comment | This value was not reported by Ziegler et al., 2013, and is left blank for MD02-2588. New data for Site 361-U1475 samples are in review at Starr et al. (2024). |
| 12 | Globorotalia truncatulinoides, δ18O | G. truncatulinoides δ18O | ‰ PDB | Starr, Aidan | see comment | vs. VPDB. MD02-2588 from Ziegler et al. (2013, doi:10.1038/ngeo1782). New Site 361-U1475 data are from Starr et al. (2024). |
| 13 | Globorotalia truncatulinoides, δ13C | G. truncatulinoides δ13C | ‰ PDB | Starr, Aidan | see comment | vs. VPDB. MD02-2588 from Ziegler et al. (2013, doi:10.1038/ngeo1782). New Site 361-U1475 data are from Starr et al. (2024). |
| 14 | Sortable-silt mean | SS | µm | Starr, Aidan | Coulter Counter (Beckman Coulter) | Average measurement of geometric mean grain size of the 10-63 µm sediment fraction (carbonate and biogenic opal removed prior to measurement). Measurements were made using a Beckman-Coulter Mastersizer 3 for MD02-2588 samples and Mastersizer 4e Coulter Counter for Site 361-U1475 samples. Samples were measured >2 times and the result was averaged. |
| 15 | Sortable-silt mean, standard deviation | SS std dev | ± | Starr, Aidan | Coulter Counter (Beckman Coulter) | Standard deviation from repeat measurements of Sortable Silt mean grain size (n > 2 measurements for each sample). This information is unavailable for MD02-2588 samples and thus only reported for Site 361-U1475 samples. |
| 16 | Sortable-silt mean, variance unit | SS var | Starr, Aidan | Coulter Counter (Beckman Coulter) | Reported as unit variance (mean = 0, standard deviation = 1). | |
| 17 | Flow rate, anomaly | Flow rate anomaly | cm/s | Starr, Aidan | Derived from Sortable Silt according to McCave et al. (2017) | Flow speed anomaly relative to Late Holocene (0-7 ka), calibration curve [cm/s] |
| 18 | Flow rate, anomaly, standard deviation | Flow rate anomaly std dev | ± | Starr, Aidan | Derived from Sortable Silt according to McCave et al. (2017) | Calibration curve [cm/s] |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
19361 data points
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