Planktonic foraminifera surface sediment samples, radiocarbon dates and sediment proxies of sediment core AU_Geo02_GC20, western South Atlantic Ocean ...
Micropaleontological analyses from the western South Atlantic core AU_Geo02_GC20 (45° 55' S - 58°30' W, 2589 m water depth) revealed changes in the primary productivity and sea surface temperature (SST) during MIS 3 that point to significant changes in the Brazil Malvinas Confluence Zone d...
| Main Authors: | , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.949261 https://doi.pangaea.de/10.1594/PANGAEA.949261 |
| Summary: | Micropaleontological analyses from the western South Atlantic core AU_Geo02_GC20 (45° 55' S - 58°30' W, 2589 m water depth) revealed changes in the primary productivity and sea surface temperature (SST) during MIS 3 that point to significant changes in the Brazil Malvinas Confluence Zone dynamics. These changes led to a marked increase in the SST and the primary productivity between 44.0 - 36.1 ka BP, as indicated by the quantitative reconstruction of the subsurface temperature, and the high relative abundance of the planktonic foraminifera Globigerina bulloides and other planktonic-based index, such as the eutrophic index. The increase in the SST and the primary productivity could be related to frequent or more persistent southward penetration of subtropical waters over the north Patagonian margin due to a southward extension of the Brazil Current and a weakening of the Malvinas Current. The high primary productivity led to intensive use of phosphate during spring. Conversely, benthic assemblages do not ... |
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