Stable isotope ratios of foraminifera, grain-size distribution and magnetic susceptibility record of sediment core MD99-2339
Fuente:
PANGAEA
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2006
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867171358914379776 |
|---|---|
| author | Voelker, Antje H L Lebreiro, Susana Martin Schönfeld, Joachim Cacho, Isabel Erlenkeuser, Helmut Abrantes, Fatima F |
| author_facet | Voelker, Antje H L Lebreiro, Susana Martin Schönfeld, Joachim Cacho, Isabel Erlenkeuser, Helmut Abrantes, Fatima F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High-resolution grain size and magnetic susceptibility records from the eastern Gulf of Cadiz (site MD99-2339; 1170m water depth) reveal contourites formed by the Mediterranean Outflow (MOW) during the last 47kyr BP. Oscillations in the MOW's intensity occurred in phase with Greenland temperature variations with a stronger outflow during northern hemisphere coolings such as Dansgaard-Oeschger stadials, Heinrich events, and the Younger Dryas. Benthic delta13C data implies the Western Mediterranean Deep Water as one of the main sources feeding the outflow current, while differential changes in the properties of the Mediterranean source and entrained North Atlantic Central Water largely control the MOW's strength. Detailed studies for Heinrich events 1, 4 and 5 show that the flow strength peaked only when subtropical surface waters prevailed in the eastern Gulf of Cadiz, while incursions of icebergs and subpolar surface water were not favorable for the MOW's intensification. As the MOW was strong when the Atlantic's thermohaline circulation (THC) was weakened, the heat and salt injected by the MOW into the intermediate North Atlantic waters might have preconditioned the THC to switch from the stadial to the interstadial mode. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_733094 |
| institution | PANGAEA |
| language | en |
| publishDate | 2006 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope ratios of foraminifera, grain-size distribution and magnetic susceptibility record of sediment core MD99-2339 Voelker, Antje H L Lebreiro, Susana Martin Schönfeld, Joachim Cacho, Isabel Erlenkeuser, Helmut Abrantes, Fatima F 94a; CALYPSO; Calypso Corer; Gulf of Cádiz, Atlantic Ocean; IMAGES; IMAGES V; International Marine Global Change Study; Marion Dufresne (1995); MD114; MD99-2339 High-resolution grain size and magnetic susceptibility records from the eastern Gulf of Cadiz (site MD99-2339; 1170m water depth) reveal contourites formed by the Mediterranean Outflow (MOW) during the last 47kyr BP. Oscillations in the MOW's intensity occurred in phase with Greenland temperature variations with a stronger outflow during northern hemisphere coolings such as Dansgaard-Oeschger stadials, Heinrich events, and the Younger Dryas. Benthic delta13C data implies the Western Mediterranean Deep Water as one of the main sources feeding the outflow current, while differential changes in the properties of the Mediterranean source and entrained North Atlantic Central Water largely control the MOW's strength. Detailed studies for Heinrich events 1, 4 and 5 show that the flow strength peaked only when subtropical surface waters prevailed in the eastern Gulf of Cadiz, while incursions of icebergs and subpolar surface water were not favorable for the MOW's intensification. As the MOW was strong when the Atlantic's thermohaline circulation (THC) was weakened, the heat and salt injected by the MOW into the intermediate North Atlantic waters might have preconditioned the THC to switch from the stadial to the interstadial mode. |
| title | Stable isotope ratios of foraminifera, grain-size distribution and magnetic susceptibility record of sediment core MD99-2339 |
| topic | 94a; CALYPSO; Calypso Corer; Gulf of Cádiz, Atlantic Ocean; IMAGES; IMAGES V; International Marine Global Change Study; Marion Dufresne (1995); MD114; MD99-2339 |
| url | https://doi.org/10.1594/PANGAEA.733094 |