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Lynch-Stieglitz, Jean; Schmidt, Matthew W; Curry, William B (2011): (Table 2) Age determination of Florida Straits sediment cores. PANGAEA, https://doi.org/10.1594/PANGAEA.827280, Supplement to: Lynch-Stieglitz, J et al. (2011): Evidence from the Florida Straits for Younger Dryas ocean circulation changes. Paleoceanography, 26(1), PA1205, https://doi.org/10.1029/2010PA002032

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Abstract:
The waters passing through the Florida Straits today reflect both the western portion of the wind-driven subtropical gyre and the northward flow of the upper waters which cross the equator, compensating North Atlantic Deep Water export as part of the large-scale Atlantic meridional overturning circulation. It has been postulated from various lines of evidence that the overturning circulation was weaker during the Younger Dryas cold event of the last deglaciation. We show here that the contrast in the oxygen isotopic composition of benthic foraminiferal tests across the Florida Current is reduced during the Younger Dryas. This most likely reflects a decrease in the density gradient across the channel and a decrease in the vertical shear of the Florida Current. This reduced shear is consistent with the postulated reduction in the Atlantic meridional overturning circulation. We find that the onset of this change in density structure and flow at the start of the Younger Dryas is very abrupt, occurring in less than 70 years.
Coverage:
Median Latitude: 24.364428 * Median Longitude: -81.299243 * South-bound Latitude: 23.745500 * West-bound Longitude: -83.295830 * North-bound Latitude: 24.848400 * East-bound Longitude: -79.265700
Date/Time Start: 2002-01-10T00:00:00 * Date/Time End: 2002-01-22T00:00:00
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 11.1825 m
Event(s):
KNR166-2-127 * Latitude: 24.763800 * Longitude: -79.265700 * Date/Time: 2002-01-22T00:00:00 * Elevation: -631.0 m * Recovery: 10.92 m * Location: Florida Strait * Campaign: KNR166-2 (KN166-2) * Basis: Knorr * Method/Device: Piston corer (PC)
KNR166-2-132 * Latitude: 24.848400 * Longitude: -79.281300 * Date/Time: 2002-01-22T00:00:00 * Elevation: -739.0 m * Recovery: 10.51 m * Location: Florida Strait * Campaign: KNR166-2 (KN166-2) * Basis: Knorr * Method/Device: Piston corer (PC)
KNR166-2-26 (KNR166-2-26JPC) * Latitude: 24.327000 * Longitude: -83.252330 * Date/Time: 2002-01-10T00:00:00 * Elevation: -546.0 m * Recovery: 11.52 m * Location: Florida Strait * Campaign: KNR166-2 (KN166-2) * Basis: Knorr * Method/Device: Piston corer (PC)
Comment:
14C age calibrated using Calib 5.0.2 and Marine04 curve if younger than 26,000 years B.P.; otherwise, Fairbanks0107 with a 400 year surface reservoir age was used (http://radiocarbon.ldeo.columbia.edu/research/radcarbcal.htm).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Age, dated materialDated materialLynch-Stieglitz, Jean
7Age, datedAge datedkaLynch-Stieglitz, JeanAge, 14C AMS
8Age, dated standard deviationAge dated std dev±Lynch-Stieglitz, JeanAge, 14C AMS
9Calendar ageCal ageka BPLynch-Stieglitz, JeanAge, 14C calibrated
10Age, commentCommLynch-Stieglitz, Jean
Size:
350 data points

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