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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2019
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| Online-Zugang: | https://doi.org/10.1594/PANGAEA.909084 |
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| _version_ | 1867167677458415616 |
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| author | Huang, Huang Gutjahr, Marcus Eisenhauer, Anton Kuhn, Gerhard |
| author_facet | Huang, Huang Gutjahr, Marcus Eisenhauer, Anton Kuhn, Gerhard |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Weddell Sea-derived Antarctic Bottom Water (AABW) is one of the most important deep water masses in the Southern Hemisphere occupying large portions of the deep Southern Ocean (SO) today. While substantial changes in SO-overturning circulation were previously suggested, the state of Weddell Sea AABW export during glacial climates remains poorly understood. Here we report seawater-derived Nd and Pb isotope records that provide evidence for the absence of Weddell Sea-derived AABW in the Atlantic sector of the SO during the last two glacial maxima. Increasing delivery of Antarctic Pb to regions outside the Weddell Sea traced SO frontal displacements during both glacial terminations. The export of Weddell Sea-derived AABW resumed late during glacial terminations, coinciding with the last major atmospheric CO~2~ rise in the transition to the Holocene and the Eemian. Our new records lend strong support for a previously inferred AABW overturning stagnation event during the peak Eemian interglacial. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_909084 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Authigenic Pb and Nd isotope composition of sediments from the Southern Ocean Huang, Huang Gutjahr, Marcus Eisenhauer, Anton Kuhn, Gerhard AWI_Paleo; GEOMAR; Helmholtz Centre for Ocean Research Kiel; Ocean Drilling Program; ODP; Paleoenvironmental Reconstructions from Marine Sediments @ AWI Weddell Sea-derived Antarctic Bottom Water (AABW) is one of the most important deep water masses in the Southern Hemisphere occupying large portions of the deep Southern Ocean (SO) today. While substantial changes in SO-overturning circulation were previously suggested, the state of Weddell Sea AABW export during glacial climates remains poorly understood. Here we report seawater-derived Nd and Pb isotope records that provide evidence for the absence of Weddell Sea-derived AABW in the Atlantic sector of the SO during the last two glacial maxima. Increasing delivery of Antarctic Pb to regions outside the Weddell Sea traced SO frontal displacements during both glacial terminations. The export of Weddell Sea-derived AABW resumed late during glacial terminations, coinciding with the last major atmospheric CO~2~ rise in the transition to the Holocene and the Eemian. Our new records lend strong support for a previously inferred AABW overturning stagnation event during the peak Eemian interglacial. |
| title | Authigenic Pb and Nd isotope composition of sediments from the Southern Ocean |
| topic | AWI_Paleo; GEOMAR; Helmholtz Centre for Ocean Research Kiel; Ocean Drilling Program; ODP; Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
| url | https://doi.org/10.1594/PANGAEA.909084 |