Bertrand, Philippe; Giraudeau, Jacques; Malaizé, Bruno; Martinez, Philippe; Gallinari, Morgane; Pedersen, Thomas F; Pierre, Catherine; Vénec-Peyré, Marie-Thérèse (2002): BioSil indet, CaCO3 and TOC data of sediment core MD96-2086 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.57844, Supplement to: Bertrand, P et al. (2002): Occurrence of an exceptional carbonate dissolution episode during early glacial isotope stage 6 in the Southeastern Atlantic. Marine Geology, 180(1-4), 235-248, https://doi.org/10.1016/S0025-3227(01)00216-X
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Abstract:
Concentration and mass accumulation rate profiles from Southeastern Atlantic sediment cores located off Namibia show that an exceptional episode in benthic carbonate dissolution occurred during early glacial isotope stage 6 (substages 6.6 and 6.5) between about 186 000 and 170 000 yr BP. Although this episode is restricted to or is more pronounced in this region than in other areas of the Atlantic Ocean, its exceptional character with respect to older and younger climatic episodes at the same site cannot be fully explained by local factors alone, but requires a combination of local and global influences. The onset of the carbonate dissolution episode is related to a more efficient transfer of organic matter from surface eutrophic areas to the lower and is due to low sea level, while its termination relates to a change in either global ocean alkalinity or bottom water circulation. An evaluation of the magnitude of this local carbonate dissolution episode suggests that its contribution to a global alkalinity change may have been significant. Carbonate dissolution was probably amplified by stronger upwelling activity of the Benguela System linked to an exceptional northern excursion of the boreal summer ITCZ during early glacial isotope stage 6. This low latitude global linkage may explain how this carbonate dissolution event as well as other 'anomalies' observed for early stage 6, like an important Dole effect minimum or a 'cold' Mediterranean sapropel, are related.
Related to:
Bertrand, Philippe; Schneider, Ralph R; Shimmield, Graham; Lallier-Verges, Elisabeth; Disnar, J R; Massias, D; Villanueva, Joan; Tribovillard, Nicolas; Huc, Alain Y; Giraud, Xavier; Pierre, Catherine; Vénec-Peyré, Marie-Thérèse (2003): Organic-rich sediments in ventilated deep-sea environments: Relationship to climate, sea level, and trophic changes. Journal of Geophysical Research: Oceans, 108(C2), 3045, https://doi.org/10.1029/2000JC000327
Project(s):
Coverage:
Latitude: -25.813330 * Longitude: 12.128330
Date/Time Start: 1996-10-05T00:00:00 * Date/Time End: 1996-10-05T00:00:00
Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 36.01 m
Event(s):
MD96-2086 (MD962086) * Latitude: -25.813330 * Longitude: 12.128330 * Date/Time: 1996-10-05T00:00:00 * Elevation: -3606.0 m * Recovery: 36.04 m * Location: Lüderitz Transect * Campaign: MD105 (IMAGES II) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: Top pale olive gray Foram-bearing Nanno Ooze. CC: stiff olive mud, H2S odor (liner cutted with a saw).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Calcium carbonate | CaCO3 | % | Bertrand, Philippe | Element analyser CHN, LECO | |
| 3 | Carbon, organic, total | TOC | % | Bertrand, Philippe | Element analyser CHN, LECO | |
| 4 | Biosiliceous indet | Biosil | % | Bertrand, Philippe | extraction, 6 h with 5% Na2CO3, precision 5% |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
737 data points