Aharon, Paul (2003): (Table 2) Radiocarbon content and 14C AMS ages of planktonic foraminifera from sediment cores Louis_1900 and Louis_2023 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.841362, Supplement to: Aharon, P (2003): Meltwater flooding events in the Gulf of Mexico revisited: Implications for rapid climate changes during the last deglaciation. Paleoceanography, 18(4), 1079, https://doi.org/10.1029/2002PA000840
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Abstract:
North American freshwater runoff records have been used to support the case that climate flickers were caused by shutdowns of the ocean thermohaline circulation (THC) resulting from reversals of meltwater discharges. Inconsistencies in the documentation of these meltwater switches, however, continue to fuel the debate on the cause/s of the oscillatory nature of the deglacial climate. New oxygen and carbon isotope records from the northern Gulf of Mexico depict in exceptional detail the succession of meltwater floods and pauses through the southern routing during the interval 16 to 8.9 ka (14C years BP; ka, kiloannum). The records underscore the bimodal role played by the Gulf of Mexico as a destination of meltwater discharges from the receding Laurentide Ice Sheet. The evidence indicates that the Gulf of Mexico acted as the principal source of superfloods at 13.4, 12.6, and 11.9 ka that reached the North Atlantic and contributed significantly to density stratification, disruption of ocean ventilation, and cold reversals. Gulf of Mexico lapsed into a “relief valve” position in post-Younger Dryas time, when meltwater discharges were rerouted south at 9.9, 9.7, 9.4, and 9.1 ka, thus temporarily interrupting North Atlantic-bound freshwater discharges from Lake Agassiz. The history of meltwater events in the Gulf of Mexico contradicts the model that meltwater flow via the eastern outlets into the North Atlantic disrupted the ocean THC, causing cooling, while diversions to the Gulf of Mexico via the Mississippi River enhanced THC and warming.
Further details:
Aharon, Paul; Schwarcz, Henry P; Roberts, Harry H (1997): Radiometric dating of submarine hydrocarbon seeps in the Gulf of Mexico. Geological Society of America Bulletin, 109(5), 568-579, https://doi.org/10.1130/0016-7606(1997)109%3C0568:RDOSHS%3E2.3.CO;2
Coverage:
Median Latitude: 27.915000 * Median Longitude: -91.290000 * South-bound Latitude: 27.760000 * West-bound Longitude: -92.590000 * North-bound Latitude: 28.070000 * East-bound Longitude: -89.990000
Minimum DEPTH, sediment/rock: 0.30 m * Maximum DEPTH, sediment/rock: 3.00 m
Event(s):
Comment:
A 1 cm thick slice of sediment was used for sample processing.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Species | Species | Aharon, Paul | Monospecific G. ruber in weights ranging from 6.8 to 10.7 mg were handpicked for radiocarbon analyses except core 2023 were paired G. ruber and a mixed assemblage of Globigerinoides sp. were handpicked at 260 cm and 200 cm core depths. | ||
| 4 | Globigerinoides ruber, δ13C | G. ruber δ13C | ‰ PDB | Aharon, Paul | used to correct for isotope fractionation; * = Globigerinoides | |
| 5 | Δ14C | Δ14C | ‰ | Aharon, Paul | Permil departure of sample activity, corrected for isotope fractionation, from the activity of the modern standard. This way a sample of an 'infinite' 14C age would have a D14C of ?1000 per mil. Samples were converted to CO2 in the laboratory and shipped in breakseal glass tubes to the Institute of Nuclear Sciences in New Zealand where the 14C contents were measured with a 6 MV tandem accelerator. | |
| 6 | Δ14C, standard deviation | Δ14C std dev | ± | Aharon, Paul | ||
| 7 | Age, dated | Age dated | ka | Aharon, Paul | Age, 14C milieu/reservoir corrected (-400 yr) | Ages were calculated after 13C/12C normalization using Libby's half-life of 5568 years and were corrected by 400 years for the 14C/C difference between atmospheric CO2 and inorganic carbon dissolved in the Gulf of Mexico surface water (Aharon et al., 1997). |
| 8 | Age, dated standard deviation | Age dated std dev | ± | Aharon, Paul |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
72 data points