Foster, Gavin L; Sexton, Philip F (2014): Summary of boron isotope and Mg/Ca data [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.839680, Supplement to: Foster, GL; Sexton, PF (2014): Enhanced carbon dioxide outgassing from the eastern equatorial Atlantic during the last glacial. Geology, 42(11), 1003-1006, https://doi.org/10.1130/G35806.1
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Abstract:
Biological productivity and carbon export in the equatorial Atlantic are thought to have been dramatically higher during the last glacial period than during the Holocene. Here we reconstruct the pH and CO2 content of surface waters from the eastern equatorial Atlantic Ocean over the past ~30 k.y. using the boron isotope composition of Globigerinoides ruber (a mixed-layer-dwelling planktic foraminifera). Our new record, combined with previously published data, indicates that during the last glacial, in contrast to today, a strong west to east gradient existed in the extent of air:sea equilibrium with respect to pCO2 (DeltapCO2), with the eastern equatorial Atlantic acting as a significant source of CO2 (+100 µatm) while the western Atlantic remained close to equilibrium (+25 µatm). This pattern suggests that a fivefold increase in the upwelling rate of deeper waters drove increased Atlantic productivity and large-scale regional cooling during the last glacial, but the higher than modern DeltapCO2 in the east indicates that export production did not keep up with enhanced upwelling of nutrients. However, the downstream decline of DeltapCO2 provides evidence that the unused nutrients from the east were eventually used for biologic carbon export, thereby effectively negating the impact of changes in upwelling on atmospheric CO2 levels. Our findings indicate that the equatorial Atlantic exerted a minimal role in contributing to lower glacial-age atmospheric CO2.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 4.970222 * Median Longitude: -44.263099 * South-bound Latitude: -1.665000 * West-bound Longitude: -78.739300 * North-bound Latitude: 12.744000 * East-bound Longitude: -12.428330
Date/Time Start: 1989-02-25T00:00:00 * Date/Time End: 1996-01-14T23:15:00
Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 1.67 m
Event(s):
165-999A * Latitude: 12.744000 * Longitude: -78.739300 * Date/Time Start: 1996-01-10T19:30:00 * Date/Time End: 1996-01-14T23:15:00 * Elevation: -2828.0 m * Penetration: 566.1 m * Recovery: 534.83 m * Location: Caribbean Sea * Campaign: Leg165 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 61 core; 566.1 m cored; 0 m drilled; 94.5 % recovery
GeoB1105-4 * Latitude: -1.665000 * Longitude: -12.428330 * Date/Time: 1989-02-25T00:00:00 * Elevation: -3225.0 m * Penetration: 17 m * Recovery: 15.22 m * Location: Equatorial Atlantic * Campaign: M9/4 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: cc: Karbonatschlamm, tonig
GeoB1523-1 * Latitude: 3.831667 * Longitude: -41.621667 * Date/Time: 1991-05-17T00:00:00 * Elevation: -3292.0 m * Recovery: 6.65 m * Location: Amazon Fan * Campaign: M16/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | AGE | Age | ka BP | Geocode | ||
| 4 | δ11B | δ11B | ‰ SRM | Foster, Gavin L | MC-ICP-MS Thermo-Finnigan Neptune | |
| 5 | δ11B, standard deviation | δ11B std dev | ± | Foster, Gavin L | ||
| 6 | Globigerinoides ruber, Magnesium/Calcium ratio | G. ruber Mg/Ca | mmol/mol | Foster, Gavin L | ICP-MS, Thermo Fisher Scientific, Element 2 | |
| 7 | Sea surface temperature, annual mean | SST (1-12) | °C | Foster, Gavin L | Calculated from Mg/Ca ratios (Anand et al., 2003) | |
| 8 | Carbon dioxide (water) partial pressure | pCO2(aq) | µatm | Foster, Gavin L | seawater | |
| 9 | Carbon dioxide (water) partial pressure | pCO2(aq) | µatm | Foster, Gavin L | seawater, 2.5% | |
| 10 | Carbon dioxide (water) partial pressure | pCO2(aq) | µatm | Foster, Gavin L | seawater, 14% | |
| 11 | Carbon dioxide (water) partial pressure | pCO2(aq) | µatm | Foster, Gavin L | seawater, 86% | |
| 12 | Carbon dioxide (water) partial pressure | pCO2(aq) | µatm | Foster, Gavin L | seawater, 97.5% |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
423 data points