Saenger, Casey; Came, Rosemarie E; Oppo, Delia W; Keigwin, Lloyd D; Cohen, Anne L (2011): (Table 1) Age determination of sediment cores CH07-98-22 and KNR140-2-59 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.830724, Supplement to: Saenger, C et al. (2011): Regional climate variability in the western subtropical North Atlantic during the past two millennia. Paleoceanography, 26(2), PA2206, https://doi.org/10.1029/2010PA002038
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Abstract:
Western subtropical North Atlantic oceanic and atmospheric circulations connect tropical and subpolar climates. Variations in these circulations can generate regional climate anomalies that are not reflected in Northern Hemisphere averages. Assessing the significance of anthropogenic climate change at regional scales requires proxy records that allow recent trends to be interpreted in the context of long-term regional variability. We present reconstructions of Gulf Stream sea surface temperature (SST) and hydrographic variability during the past two millennia based on the magnesium/calcium ratio and oxygen isotopic composition of planktic foraminifera preserved in two western subtropical North Atlantic sediment cores. Reconstructed SST suggests low-frequency variability of ~1°C during an interval that includes the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA). A warm interval near 1250 A.D. is distinct from regional and hemispheric temperature, possibly reflecting regional variations in ocean-atmosphere heat flux associated with changes in atmospheric circulation (e.g., the North Atlantic Oscillation) or the Atlantic Meridional Overturning Circulation. Seawater d18O, which is marked by a fresher MCA and a more saline LIA, covaries with meridional migrations of the Atlantic Intertropical Convergence Zone. The northward advection of tropical salinity anomalies by mean surface currents provides a plausible mechanism linking Carolina Slope and tropical Atlantic hydrology.
Coverage:
Median Latitude: 32.880500 * Median Longitude: -76.296000 * South-bound Latitude: 32.784000 * West-bound Longitude: -76.316000 * North-bound Latitude: 32.977000 * East-bound Longitude: -76.276000
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 2.970 m
Event(s):
CH07-98-22 * Latitude: 32.784000 * Longitude: -76.276000 * Elevation: -1895.0 m * Location: North Atlantic * Method/Device: MultiCorer (MUC)
KNR140-2-59 * Latitude: 32.977000 * Longitude: -76.316000 * Elevation: -1205.0 m * Location: North Atlantic * Campaign: KNR140 * Basis: Knorr * Method/Device: Giant gravity corer (GGC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Laboratory code/label | Lab label | Saenger, Casey | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Depth, top/min | Depth top | m | Saenger, Casey | ||
| 5 | Depth, bottom/max | Depth bot | m | Saenger, Casey | ||
| 6 | Age, dated | Age dated | ka | Saenger, Casey | Age, 14C AMS | |
| 7 | Age, dated standard deviation | Age dated std dev | ± | Saenger, Casey | Age, 14C AMS | |
| 8 | Calendar age | Cal age | ka BP | Saenger, Casey | Age, 14C milieu/reservoir corrected | |
| 9 | Calendar age, standard deviation | Cal age std dev | ± | Saenger, Casey | Age, 14C milieu/reservoir corrected | Carolina Slope reservoir correction of 225 years (Butzin et al., 2005, doi:10.1016/j.epsl.2005.03.003) |
| 10 | Age, comment | Comm | Saenger, Casey | |||
| 11 | Age, dated material | Dated material | Saenger, Casey |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
70 data points