Keigwin, Lloyd D; Boyle, Edward A (2008): (Table 1) Age determination of sediment cores HU89038_8 and OCE326-GGC5 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.832421, Supplement to: Keigwin, LD; Boyle, EA (2008): Did North Atlantic overturning halt 17,000 years ago? Paleoceanography, 23(1), PA1101, https://doi.org/10.1029/2007PA001500
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Abstract:
Models indicate that a complete shutdown of deep and intermediate water production is a possible consequence of extreme climate conditions in the northern North Atlantic, and the high ratio of 231Pa to 230Th on Bermuda Rise is evidence that this might have happened ∼17 ka during Heinrich event 1 (H1). However, new radiocarbon data from bivalves that lived at ∼4.6 km on the Bermuda Rise during H1 lead to a different conclusion. The bivalve data do indeed indicate ventilation of the deep western North Atlantic was suppressed during H1 but not as much as it was during the last glacial maximum. We propose that high diatom flux to the Bermuda Rise during H1 is at least in part responsible for increased 231Pa/230Th at that time. Although we cannot say for sure why opal production was so high in a gyre center location at that time, increased leakage of silica rich waters from the Southern Ocean to the North Atlantic is one possibility.
Further details:
McManus, Jerry F; Francois, Roger; Gherardi, Jeanne-Marie; Keigwin, Lloyd D; Brown Leger, Susan (2004): Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes. Nature, 428(6985), 834-837, https://doi.org/10.1038/nature02494
Coverage:
Median Latitude: 33.695000 * Median Longitude: -57.579150 * South-bound Latitude: 33.690000 * West-bound Longitude: -57.583300 * North-bound Latitude: 33.700000 * East-bound Longitude: -57.575000
Minimum DEPTH, sediment/rock: 2.21 m * Maximum DEPTH, sediment/rock: 5.75 m
Event(s):
Comment:
Sample OCE326-GGGC5 2.21 m depth, G. inflata reported on previously by McManus et al. (2004).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Age, dated material | Dated material | Keigwin, Lloyd D | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Age, dated | Age dated | ka | Keigwin, Lloyd D | Age, 14C AMS | |
| 5 | Age, dated standard deviation | Age dated std dev | ± | Keigwin, Lloyd D | Age, 14C AMS | |
| 6 | Laboratory code/label | Lab label | Keigwin, Lloyd D | |||
| 7 | Calendar age | Cal age | ka BP | Keigwin, Lloyd D | Age, 14C calibrated | |
| 8 | Calendar age, standard deviation | Cal age std dev | ± | Keigwin, Lloyd D | Age, 14C calibrated |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
30 data points