Rogerson, Mike; Rohling, Eelco J; Weaver, Philip PE (2014): (Table 2) Age determination of sediment cores from the Portuguese Margin [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.833682, Supplement to: Rogerson, M et al. (2006): Promotion of meridional overturning by Mediterranean-derived salt during the last deglaciation. Paleoceanography, 21(4), PA4101, https://doi.org/10.1029/2006PA001306
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Abstract:
We demonstrate that changes in the behavior of the Mediterranean Outflow Water (MOW) prior to and through the last deglaciation played an important role in promoting Meridional Overturning Circulation (MOC). Estimation of past MOW salt and heat fluxes indicates that they gradually increased through the last deglaciation. Between 17.5 and 14.6 thousand years ago (ka B.P., where B.P. references year 1950), net evaporation from the Mediterranean exported sufficient fresh water from the North Atlantic catchment to cause an average salinity increase of 0.5 psu throughout the upper 2000 m of the entire North Atlantic to the north of 25°N. Combined with rapid intensification and shoaling of the MOW plume, which we identify around 15-14.5 ka B.P., this deglacial MOW-related salt accumulation preconditioned the North Atlantic for abrupt resumption of the MOC at 14.6 ka B.P.
Coverage:
Median Latitude: 35.905557 * Median Longitude: -7.333333 * South-bound Latitude: 35.816670 * West-bound Longitude: -7.516670 * North-bound Latitude: 36.050000 * East-bound Longitude: -7.183330
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 4.02 m
Event(s):
D13686 * Latitude: 35.850000 * Longitude: -7.183330 * Elevation: -998.0 m * Location: Portuguese Margin * Campaign: D249 * Basis: Discovery (1962) * Method/Device: Piston corer (PC)
D13896 * Latitude: 36.050000 * Longitude: -7.300000 * Elevation: -1111.0 m * Location: Portuguese Margin * Campaign: D249 * Basis: Discovery (1962) * Method/Device: Piston corer (PC)
D13900 * Latitude: 35.816670 * Longitude: -7.516670 * Elevation: -1297.0 m * Location: Portuguese Margin * Campaign: D249 * Basis: Discovery (1962) * Method/Device: Piston corer (PC)
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 | Age dated | ka | Rogerson, Mike | Age, 14C AMS | |
| 7 | Age, dated standard deviation | Age dated std dev | ± | Rogerson, Mike | Age, 14C AMS | |
| 8 | Calendar age | Cal age | ka BP | Rogerson, Mike | Age, 14C milieu/reservoir corrected (-400 yr) | |
| 9 | Laboratory code/label | Lab label | Rogerson, Mike |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
32 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 Depth sed [m] | 6 Age dated [ka] | 7 Age dated std dev [±] | 8 Cal age [ka BP] | 9 Lab label |
|---|---|---|---|---|---|---|---|---|
| D13900 | 35.817 | -7.517 | -1297 | 0.00 | 4.390 | 0.030 | 3.60 | KIA 27016 |
| D13900 | 35.817 | -7.517 | -1297 | 0.59 | 6.330 | 0.035 | 5.65 | KIA 27017 |
| D13900 | 35.817 | -7.517 | -1297 | 1.51 | 8.475 | 0.040 | 7.90 | KIA 27018 |
| D13900 | 35.817 | -7.517 | -1297 | 1.73 | 10.245 | 0.050 | 10.70 | KIA 27019 |
| D13900 | 35.817 | -7.517 | -1297 | 2.33 | 14.780 | 0.080 | 16.50 | KIA 27020 |
| D13900 | 35.817 | -7.517 | -1297 | 4.02 | 15.400 | 0.090 | 17.10 | KIA 27021 |
| D13686 | 35.850 | -7.183 | -998 | 0.32 | 3.490 | 0.030 | 2.40 | KIA 27014 |
| D13896 | 36.050 | -7.300 | -1111 | 0.31 | 12.340 | 0.070 | 13.10 | KIA 27015 |