Keigwin, Lloyd D; Sachs, Julian P; Rosenthal, Yair; Boyle, Edward A (2005): (Table 1) Age determination of North Atlantic sediment cores [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.837084, Supplement to: Keigwin, LD et al. (2005): The 8200 year B.P. event in the slope water system, western subpolar North Atlantic. Paleoceanography, 20(2), PA2003, https://doi.org/10.1029/2004PA001074
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Abstract:
Stable isotope, trace metal, alkenone paleothermometry, and radiocarbon methods have been applied to sediment cores in the western subpolar North Atlantic between Hudson Strait and Cape Hatteras to reveal the history of climate in that region over the past ~11 kyr. We focus on cores from the Laurentian Fan, which is known to have rapid and continuous accumulation of hemipelagic sediment. Although results among our various proxy data are not always in agreement, the weight of the evidence (alkenone sea surface temperature (SST), d18O and abundance of Globigerinoides ruber) indicates a continual cooling of surface waters over Laurentian Fan, from about 18°C in the early Holocene to about 8°C today. Alternatively, Mg/Ca data on planktonic foraminifera indicate no systematic change in Holocene SST. The inferred long-term decrease in SST was probably driven by decreasing seasonality of Northern Hemisphere insolation. Two series of proxy data show the gradual cooling was interrupted by a two-step cold pulse that began 8500 years ago, and lasted about 700 years. Although this event is associated with the final deglaciation of Hudson Bay, there is no d18O minimum anywhere in the Labrador Sea, yet there is some evidence for it as far south as Cape Hatteras. Finally, although the 8200 year B.P. event has been implicated in decreasing North Atlantic ventilation, and hence widespread temperature depression on land and at sea, we find inconsistent evidence for a change at that time in deep ocean nutrient content at ~4 km water depth.
Related to:
Keigwin, Lloyd D; Pickart, Robert (1999): Slope water current over the Laurentian Fan on interannual to millennial time scales. Science, 286(5439), 520-523, https://doi.org/10.1126/science.286.5439.520
Coverage:
Median Latitude: 42.171947 * Median Longitude: -58.633638 * South-bound Latitude: 36.867000 * West-bound Longitude: -74.567000 * North-bound Latitude: 43.483300 * East-bound Longitude: -54.867000
Date/Time Start: 1998-07-06T00:00:00 * Date/Time End: 1998-07-06T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 4.410 m
Event(s):
Comment:
Including data of Keigwin and Pickart (1999) on OCE326-MC13 and OCE326-MC25.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Age, dated material | Dated material | Keigwin, Lloyd D | |||
| 7 | Age, dated | Age dated | ka | Keigwin, Lloyd D | Age, 14C AMS | 0 = fraction modern >1 |
| 8 | Age, dated standard error | Age std e | ± | Keigwin, Lloyd D | Age, 14C AMS | 1 sigma |
| 9 | Laboratory code/label | Lab label | Keigwin, Lloyd D | NOSAMS | ||
| 10 | Calendar age | Cal age | ka BP | Keigwin, Lloyd D | ||
| 11 | Age, maximum/old | Age max | ka | Keigwin, Lloyd D | ||
| 12 | Age, minimum/young | Age min | ka | Keigwin, Lloyd D |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
298 data points