Kao, Shuh-Ji; Dai, Minhan; Wei, Kuo-Yen; Blair, N E; Lyons, William B (2008): (Table 1) Age determimnation of sediment core MD01-2403 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.832389, Supplement to: Kao, S-J et al. (2008): Enhanced supply of fossil organic carbon to the Okinawa Trough since the last deglaciation. Paleoceanography, 23(2), PA2207, https://doi.org/10.1029/2007PA001440
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Abstract:
Significantly older 14C ages by 2500-7900 years are found for sedimentary total organic carbon (TOC) when compared to ages of codeposited surface-dwelling foraminifera in the southern Okinawa Trough. This age discrepancy increases with rising sea level since the Last Glacial Maximum. A progressive shift in TOC d13C toward more negative values with rising sea level reflects an increasing fractional contribution of terrestrial organics (soil organics, plant debris, and/or fossil organics) to the buried organic pool. Organic matter previously stored on the East China Sea shelf during sea level lowstand and riverine material from Taiwan may be the sources that cause the d13CTOC to shift to more terrestrial values. During the Holocene when sea level is above -40 m, d13CTOC values stabilize within a narrow range (-22.3 to -22.8 per mil) while age discrepancies continue to increase and less chemically weathered sediments are deposited. The increase in age discrepancy between TOC and foraminifera in the Holocene may be due to a wetter climate that drove higher rates of physical weathering on Taiwan and greater transport rates of fossil organic C-bearing lithogenic sediment to the ocean. The climate impact on the relative delivery of fossil and nonfossil TOC in depositional settings influenced by fluvial sources should be considered in interpretations of sedimentary C isotope records.
Coverage:
Latitude: 25.283000 * Longitude: 123.160000
Date/Time Start: 2001-05-28T05:57:00 * Date/Time End: 2001-05-28T05:57:00
Minimum DEPTH, sediment/rock: 0.265 m * Maximum DEPTH, sediment/rock: 19.915 m
Event(s):
MD01-2403 (MD012403) * Latitude: 25.283000 * Longitude: 123.160000 * Date/Time: 2001-05-28T05:57:00 * Elevation: -1350.0 m * Recovery: 36.3 m * Location: Formosa Strait * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne (1995) * Method/Device: Giant piston corer (GPC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Depth, top/min | Depth top | m | Kao, Shuh-Ji | ||
| 3 | Depth, bottom/max | Depth bot | m | Kao, Shuh-Ji | ||
| 4 | Age, dated | Age dated | ka | Kao, Shuh-Ji | Age, 14C AMS | planktonic foraminifera (Globigerinoides ruber, G. sacculifer, G. conglobatus, Globigerina ququilateralis, Orbulina universa) |
| 5 | Age, dated standard deviation | Age dated std dev | ± | Kao, Shuh-Ji | Age, 14C AMS | planktonic foraminifera (Globigerinoides ruber, G. sacculifer, G. conglobatus, Globigerina ququilateralis, Orbulina universa) |
| 6 | Sample mass | Samp m | mg | Kao, Shuh-Ji | ||
| 7 | Foraminifera, planktic δ13C | Foram plankt δ13C | ‰ PDB | Kao, Shuh-Ji | planktonic foraminifera (Globigerinoides ruber, G. sacculifer, G. conglobatus, Globigerina ququilateralis, Orbulina universa) | |
| 8 | Age, dated | Age dated | ka | Kao, Shuh-Ji | Age, 14C AMS | TOC |
| 9 | Age, dated standard deviation | Age dated std dev | ± | Kao, Shuh-Ji | Age, 14C AMS | TOC |
| 10 | Age, difference | Age diff | ka | Kao, Shuh-Ji | Age, 14C AMS | TOC-planktonic foraminifera |
| 11 | Age, difference error | Age diff e | ± | Kao, Shuh-Ji | Age, 14C AMS | TOC-planktonic foraminifera |
| 12 | Carbon, organic, total | TOC | % | Kao, Shuh-Ji | contemporaneous OC, defined as TOC formed near the time of deposition | |
| 13 | Calendar age | Cal age | ka BP | Kao, Shuh-Ji | Age, 14C calibrated |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
128 data points