Sortable silt paleo-current proxies of sediment core GeoB13862-1 from the Southwest Atlantic
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| Auteurs principaux: | , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2016
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| _version_ | 1867168181678768128 |
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| author | Voigt, Ines Chiessi, Cristiano Mazur Piola, Alberto R Henrich, Rüdiger |
| author_facet | Voigt, Ines Chiessi, Cristiano Mazur Piola, Alberto R Henrich, Rüdiger |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_873264 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sortable silt paleo-current proxies of sediment core GeoB13862-1 from the Southwest Atlantic Voigt, Ines Chiessi, Cristiano Mazur Piola, Alberto R Henrich, Rüdiger 496; AGE; Beckman Coulter Laser diffraction particle size analyzer LS 13 320; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GC; GeoB13862-1; Gravity corer; M78/3B; MARUM; Meteor (1986); Silt/clay ratio; Size fraction 0.063-0.010 mm, sortable silt; Sortable-silt mean Antarctic Intermediate Water (AAIW) is an essential component of the Atlantic meridional overturning circulation (AMOC) contributing to balance the southward flow of North Atlantic Deep Water (NADW). However, the role of AAIW in Holocene abrupt climate changes remains poorly understood. Here we reconstruct changes in the flow strength of AAIW based on a high temporal resolution paleocurrent record from the Southwest Atlantic. Superimposed on a slight increase in AAIW strength at ~ 7 ka BP, a succession of millennial-scale AAIW variations is recognized in our paleocurrent records indicating a highly variable intermediate water circulation throughout the Holocene. Although variations in the strength and position of the Southern Westerlies Winds (SWW) are proposed to greatly influence the formation and circulation of AAIW, we cannot confirm such a potential SWW-AAIW linkage since our records of AAIW flow strength do not correlate to Holocene shifts of the SWW across the Atlantic. However, our data shows a good correspondence with abrupt variations in the AMOC with enhanced (reduced) northward advection of AAIW during periods of reduced (enhanced) NADW circulation. These results provide evidence for a Holocene AAIW-NADW see-saw. Thus, although the exact forcing mechanism remains unresolved, we suggest that Holocene perturbations in AAIW exerted a significant impact on the AMOC. |
| title | Sortable silt paleo-current proxies of sediment core GeoB13862-1 from the Southwest Atlantic |
| topic | 496; AGE; Beckman Coulter Laser diffraction particle size analyzer LS 13 320; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GC; GeoB13862-1; Gravity corer; M78/3B; MARUM; Meteor (1986); Silt/clay ratio; Size fraction 0.063-0.010 mm, sortable silt; Sortable-silt mean |
| url | https://doi.org/10.1594/PANGAEA.873264 |