Prahl, Frederick G; Muehlhausen, Laurel A; Lyle, Mitchell W (1989): Bulk geochemical and lipid biomarker data for sediment core W8402A-14 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.733908, Supplement to: Prahl, FG et al. (1989): An organic Geochemical Assessment of Oceanographic conditions at manop site C over the Past 26,000 Years. Paleoceanography, 4(5), 495-510, https://doi.org/10.1029/PA004i005p00495
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Abstract:
Eleven sediment samples taken downcore and representing the past 26 kyr of deposition at MANOP site C (0°57.2°N, 138°57.3°W) were analyzed for lipid biomarker composition. Biomarkers of both terrestrial and marine sources of organic carbon were identified. In general, concentration profiles for these biomarkers and for total organic carbon (TOC) displayed three common stratigraphic features in the time series: (1) a maximum within the surface sediment mixed layer (<=4 ka); (2) a broad minimum extending throughout the interglacial deposit; and (3) a deep, pronounced maximum within the glacial deposit. Using the biomarker records, a simple binary mixing model is described that assesses the proportion of terrestrial to marine TOC in these sediments. Best estimates from this model suggest that ~20% of the TOC is land-derived, introduced by long-range eolian transport, and the remainder is derived from marine productivity. The direct correlation between the records for terrestrial and marine TOC with depth in this core fits an interpretation that primary productivity at site C has been controlled by wind-driven upwelling at least over the last glacial/interglacial cycle. The biomarker records place the greatest wind strength and highest primary productivity within the time frame of 18 to 22 kyr B.P. Diagenetic effects limit our ability to ascertain directly from the biomarker records the absolute magnitude that different types of primary productivity have changed at this ocean location over the past 26 kyr.
Project(s):
Coverage:
Latitude: 0.953000 * Longitude: -138.955000
Date/Time Start: 1984-02-23T00:00:00 * Date/Time End: 1984-02-23T00:00:00
Minimum DEPTH, sediment/rock: 0.015 m * Maximum DEPTH, sediment/rock: 0.445 m
Event(s):
W8402A-14 * Latitude: 0.953000 * Longitude: -138.955000 * Date/Time: 1984-02-23T00:00:00 * Elevation: -4287.0 m * Recovery: 3.3 m * Campaign: W8402A * Basis: Wecoma * Method/Device: Gravity corer (GC)
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 | Calcium carbonate | CaCO3 | % | Prahl, Frederick G | ||
| 4 | Carbon, organic, total | TOC | % | Prahl, Frederick G | ||
| 5 | Total terrestrial fatty acids (nC20-30) | ttfa | nC20-30 | Prahl, Frederick G | Gas chromatography | |
| 6 | - | - | Prahl, Frederick G | ratio of solvent extractable (free) to acid hydrolyzed (bound) terrestrial n-acids | ||
| 7 | Carbon Preference Index | CPI | Prahl, Frederick G | free, for free and bounded terrestrial n-acid series (C20-C30) | ||
| 8 | Carbon Preference Index | CPI | Prahl, Frederick G | bound, for free and bounded terrestrial n-acid series (C20-C30) | ||
| 9 | Alkenone per unit sediment mass | Alkenone/sed | µg/g | Prahl, Frederick G | Gas chromatography | |
| 10 | Alkenone, unsaturation index UK37 | UK37 | Prahl, Frederick G | Calculated from C37 alkenones (Brassell et al., 1986) | ||
| 11 | Sea surface temperature, annual mean | SST (1-12) | °C | Prahl, Frederick G | Calculated from UK'37 (Prahl et al., 1988) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
99 data points