Posey, Ashlyn; van Hengstum, Pete; Ochs, Lee; Cave, Tyler; Coffey, Devin: Texture and Organic Carbon Analysis of Cores from Drinkwater Sinkhole in the Northern Bahamas [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997282 (dataset in review)
Abstract:
Drinkwater Sinkhole is a groundwater-fed karst lake in the northern Bahamas (Little Bahama Bank) that preserves a stratigraphic succession spanning the last 50,000 years. For seven vibracores (e.g., C11-D1, C6-D4, C7-D4, C7-D5, C8-D3, C8-D4, C9-D3), the attached database provides measurements of bulk organic matter, coarse carbonate fraction, coarse organic matter fraction, total organic carbon, carbon-to-nitrogen (C:N) ratios, stable carbon isotope values of the bulk organic matter (δ13Corg ‰ VPDB), and a radiocarbon-based chronology. Bulk organic matter content (%) was measured at 0.5–1 cm resolution down the full length of each core using standard loss-on-ignition (Heiri et al., 2001). However, coarse carbonate and coarse organic matter (>63 µm, mg/cm³) were only measured below the fern peat lithofacies (older than ~18 ka). These parameters were quantified at ~1 cm resolution using a sieve-first loss-on-ignition procedure (van Hengstum et al., 2016). A subset of samples from each core was additionally analyzed for total organic carbon content (%), organic carbon-to-nitrogen ratio, and the stable carbon isotope values of the bulk organic matter (δ13Corg ‰ VPDB). Conventional radiocarbon ages of plant macrofossils were calibrated to calendar years before present, and downcore age models were constructed using a Bayesian statistical approach (rbacon v3.5.2; Blaauw and Christen, 2011). Calibrated calendar ages (minimum, maximum, median, and mean, ka BP) are reported at each analyzed depth. These textural, geochemical, and chronological data support paleoenvironmental reconstruction of Drinkwater Sinkhole through the Late Quaternary.
Keyword(s):
References:
Blaauw, Maarten; Christen, Andrés (2011): Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis, 6(3), 457-474, https://doi.org/10.1214/11-BA618
Heiri, Oliver; Lotter, André F; Lemcke, G (2001): Loss on ignition as a method for estimating organic and carbonate content in sediments: reproducibility and comparability of results. Journal of Paleolimnology, 25(1), 101-110, https://doi.org/10.1023/A:1008119611481
van Hengstum, Peter J; Donnelly, Jeffrey P; Fall, Patricia L; Toomey, Michael R; Albury, Nancy A; Kakuk, Brian (2016): The intertropical convergence zone modulates intense hurricane strikes on the western North Atlantic margin. Scientific Reports, 6(1), 21728, https://doi.org/10.1038/srep21728
Funding:
National Science Foundation (NSF), grant/award no. EAR-17033087: Diagnosing the timing and drivers of northeastern Caribbean Holocene droughts with sinkhole lake records
Coverage:
Median Latitude: 26.868169 * Median Longitude: -77.624890 * South-bound Latitude: 26.867950 * West-bound Longitude: -77.625020 * North-bound Latitude: 26.868440 * East-bound Longitude: -77.624760
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 15.5100 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Posey, Ashlyn | |||
| 2 | Method/Device of event | Method/Device | Posey, Ashlyn | |||
| 3 | Latitude of event | Latitude | Posey, Ashlyn | |||
| 4 | Longitude of event | Longitude | Posey, Ashlyn | |||
| 5 | Section | Sect | Posey, Ashlyn | |||
| 6 | Depth, section | Depth sect | cm | Posey, Ashlyn | ||
| 7 | DEPTH, sediment/rock | Depth sed | m | Posey, Ashlyn | Geocode | |
| 8 | Organic matter, particulate | POM | % | Posey, Ashlyn | Thermolyne Largest Tabletop Muffle Furnace, Thermo Scientific™, F30438CM; followed by Heiri et al (2001) | |
| 9 | Carbonate, coarse fraction > 0.063 mm | CC | mg/cm3 | Posey, Ashlyn | Thermolyne Largest Tabletop Muffle Furnace, Thermo Scientific™, F30438CM; followed by Heiri et al (2001) | |
| 10 | Organic matter, coarse fraction > 0.063 mm | COM | mg/cm3 | Posey, Ashlyn | Thermolyne Largest Tabletop Muffle Furnace, Thermo Scientific™, F30438CM; followed by Heiri et al (2001) | |
| 11 | Carbon, organic, total | TOC | % | Posey, Ashlyn | Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage | |
| 12 | Carbon/Nitrogen ratio | C/N | Posey, Ashlyn | Calculated from total carbon and nitrogen | ||
| 13 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Posey, Ashlyn | Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage | vs. VPDB |
| 14 | Calendar age, minimum/young | Cal age min | ka BP | Posey, Ashlyn | Age, 14C calibrated, R package Bacon according to Blaauw and Christen (2011) [V.3.5.2] | |
| 15 | Calendar age, maximum/old | Cal age max | ka BP | Posey, Ashlyn | Age, 14C calibrated, R package Bacon according to Blaauw and Christen (2011) [V.3.5.2] | |
| 16 | Calendar age, median | Cal age median | ka BP | Posey, Ashlyn | Age, 14C calibrated, R package Bacon according to Blaauw and Christen (2011) [V.3.5.2] | |
| 17 | Calendar age, mean | Cal age mean | ka BP | Posey, Ashlyn | Age, 14C calibrated, R package Bacon according to Blaauw and Christen (2011) [V.3.5.2] |
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:
73365 data points
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