Little, Mark G; Schneider, Ralph R; Kroon, Dick; Price, B; Summerhayes, Colin P; Segl, Monika (1997): (Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.868915, Supplement to: Little, MG et al. (1997): Trade wind forcing of upwelling, seasonality, and Heinrich Events as a response to sub-Milankovitch climate variability. Paleoceanography, 12(4), 568-576, https://doi.org/10.1029/97PA00823
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Abstract:
Planktonic foraminifera recovered from two cores in the northern Benguela upwelling system reveal a history of rapid events with a variability at sub-Milankovitch frequencies during the last 140 kyr. The "cold-water" planktonic foraminifer, left coiling Neogloboquadrina pachyderma (Ehrenberg), shows rapid fluctuations in relative abundance, indicating changes in upwelling intensity. The periods of high abundance in left coiling N. pachyderma are referred to as "PS events" (pachyderma sinistral) and indicate increased intensity and zonality of the South Atlantic trade winds controlling the Benguela upwelling system. The good correlation between PS events, the North Atlantic Heinrich events, and the Dansgaard-Oeschger cycles from the Greenland Ice Sheet Program (GISP2) ice core suggests large-scale global oceanographic or climatic teleconnections between the South and North Atlantic via the trade wind system. The radiocarbon constrained timing of PS events younger than 45 kyr indicates that the South Atlantic leads the North Atlantic's response to trade wind changes, particularly during isotope stages 4-2 when the Earth was dominated by large ice sheets. At times of increased trade wind strength, tropical and subtropical waters are forced across the equator enhancing the pool of warm water to be transferred to the high latitudes of the North Atlantic via the Gulf Stream and North Atlantic Drift, increasing the pull of the thermohaline convective conveyor. The increased supply of warm water to the polar regions of the northern hemisphere increases the ice-ocean moisture gradient and accelerates ice sheet growth, leading to eventual instability and collapse.
Coverage:
Median Latitude: -22.791000 * Median Longitude: 12.457333 * South-bound Latitude: -23.315000 * West-bound Longitude: 12.376667 * North-bound Latitude: -22.267000 * East-bound Longitude: 12.538000
Date/Time Start: 1992-01-11T00:00:00 * Date/Time End: 1992-01-11T00:00:00
Minimum DEPTH, sediment/rock: 0.10 m * Maximum DEPTH, sediment/rock: 3.41 m
Event(s):
CH115-12PG-PC * Latitude: -22.267000 * Longitude: 12.538000 * Elevation: -1017.0 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Chain115 (CH115) * Basis: Chain * Method/Device: Composite Core (COMPCORE) * Comment: Composite core CH115-12PG (0.82 m) and CH115-12PC (6.2 m)
GeoB1711-4 (GeoB1711) * Latitude: -23.315000 * Longitude: 12.376667 * Date/Time: 1992-01-11T00:00:00 * Elevation: -1967.0 m * Recovery: 10.66 m * Location: Namibia continental slope * Campaign: M20/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: Tonschl., olive, H2S, Foram.
Comment:
Dataset was updated on 2018-01-28: dataset was assigned to a wrong publication.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Broecker, Wallace S | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Broecker, Wallace S | Geocode – mcd | |
| 3 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C AMS | |
| 4 | Age, dated standard error | Age std e | ± | Broecker, Wallace S | Age, 14C AMS | |
| 5 | Calendar age | Cal age | ka BP | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | |
| 6 | Calendar age, standard error | Cal age std e | ± | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | |
| 7 | Age, dated material | Dated material | Broecker, Wallace S | |||
| 8 | Laboratory code/label | Lab label | Broecker, Wallace S |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
64 data points