Supplementary material of IODP Site 342-U1410 and COSMOS model
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| Autori principali: | , , , , , , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2018
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| _version_ | 1867168571250966528 |
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| author | Vahlenkamp, Maximilian Niezgodzki, Igor De Vleeschouwer, David Bickert, Torsten Harper, Dustin T Kirtland Turner, Sandra Lohmann, Gerrit Sexton, Philip F Zachos, James C Pälike, Heiko |
| author_facet | Vahlenkamp, Maximilian Niezgodzki, Igor De Vleeschouwer, David Bickert, Torsten Harper, Dustin T Kirtland Turner, Sandra Lohmann, Gerrit Sexton, Philip F Zachos, James C Pälike, Heiko |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, and plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial role in today's climate system, vigorous debate remains as to when deep-water formation in the North Atlantic started. Here, we present datasets from carbonate-rich middle Eocene sediments from the Newfoundland Ridge, revealing a unique archive of paleoceanographic change from the progressively cooling climate of the middle Eocene. Well-defined lithologic alternations between calcareous ooze and clay-rich intervals occur at the ~41-kyr beat of axial obliquity. Hence, we identify obliquity as the driver of middle Eocene (43.5-46 Ma) Northern Component Water (NCW, the predecessor of modern NADW) variability. High-resolution benthic foraminiferal d18O and d13C suggest that obliquity minima correspond to cold, nutrient-depleted, western North Atlantic deep waters. We thus link stronger NCW formation with obliquity minima. In contrast, during obliquity maxima, Deep Western Boundary Currents were weaker and warmer, while abyssal nutrients were more abundant. These aspects reflect a more sluggish NCW formation. This obliquity-paced paleoceanographic regime is in excellent agreement with results from an Earth system model, in which obliquity minima configurations enhance NCW formation. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_884699 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Supplementary material of IODP Site 342-U1410 and COSMOS model Vahlenkamp, Maximilian Niezgodzki, Igor De Vleeschouwer, David Bickert, Torsten Harper, Dustin T Kirtland Turner, Sandra Lohmann, Gerrit Sexton, Philip F Zachos, James C Pälike, Heiko Center for Marine Environmental Sciences; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; MARUM North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, and plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial role in today's climate system, vigorous debate remains as to when deep-water formation in the North Atlantic started. Here, we present datasets from carbonate-rich middle Eocene sediments from the Newfoundland Ridge, revealing a unique archive of paleoceanographic change from the progressively cooling climate of the middle Eocene. Well-defined lithologic alternations between calcareous ooze and clay-rich intervals occur at the ~41-kyr beat of axial obliquity. Hence, we identify obliquity as the driver of middle Eocene (43.5-46 Ma) Northern Component Water (NCW, the predecessor of modern NADW) variability. High-resolution benthic foraminiferal d18O and d13C suggest that obliquity minima correspond to cold, nutrient-depleted, western North Atlantic deep waters. We thus link stronger NCW formation with obliquity minima. In contrast, during obliquity maxima, Deep Western Boundary Currents were weaker and warmer, while abyssal nutrients were more abundant. These aspects reflect a more sluggish NCW formation. This obliquity-paced paleoceanographic regime is in excellent agreement with results from an Earth system model, in which obliquity minima configurations enhance NCW formation. |
| title | Supplementary material of IODP Site 342-U1410 and COSMOS model |
| topic | Center for Marine Environmental Sciences; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; MARUM |
| url | https://doi.org/10.1594/PANGAEA.884699 |