Age determination of sediment cores close to the Strait of Gibralta
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| Autores principales: | , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1987
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| _version_ | 1867171357730537472 |
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| author | Zahn, Rainer Sarnthein, Michael Erlenkeuser, Helmut |
| author_facet | Zahn, Rainer Sarnthein, Michael Erlenkeuser, Helmut |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A suit of sediment cores close to and south of the Strait of Gibraltar (12°-36°N, 500-2800 m water depth) were analyzed for stable isotopes in epibenthic foraminifers Cibicidoides wuellerstorfi and Planulina ariminensis. During peak glacial times, the data exhibit higher delta13C values of up to 1.6 per mil at intermediate depths near the Strait of Gibraltar (36°N). The values decrease to the south as evidenced by our data, but also to the north as revealed by data of intermediate depth cores north of 38°N (in Duplessy et al. (1987)). Thus, the distribution pattern of delta13C provides crucial evidence for an increased influence of nutrient depleted Mediterranean Outflow Water (MOW) on the glacial northeast Atlantic hydrography. During oxygen isotope Terminations I and II, the meridional carbon isotope gradient indicates a significantly decreased but still active MOW. As deduced from the delta18O fluctuations, the temperatures of the MOW in the Atlantic were lower during glacial times by as much as 5°C. During glacial times and during Termination I the maximum delta13C values of the MOW correlate with minimum values of the North Atlantic Deep Water (NADW) and vice versa. This inverse response to climatic change of the carbon isotope signals of both water masses indicates, that the supply of saline MOW to the north Atlantic may be less important for the formation of NADW than previously assumed. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_725956 |
| institution | PANGAEA |
| language | en |
| publishDate | 1987 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age determination of sediment cores close to the Strait of Gibralta Zahn, Rainer Sarnthein, Michael Erlenkeuser, Helmut Atlantic Ocean; GIK15666-6; GIK15669-1; GIK15670-5; GIK16004-1; GIK16006-1; GIK16017-2; Gravity corer (Kiel type); KOL; M53; M53_166; M53_169; M53_170; M60; Meteor (1964); off West Africa; Piston corer (Kiel type); SL; SUBTROPEX 82 A suit of sediment cores close to and south of the Strait of Gibraltar (12°-36°N, 500-2800 m water depth) were analyzed for stable isotopes in epibenthic foraminifers Cibicidoides wuellerstorfi and Planulina ariminensis. During peak glacial times, the data exhibit higher delta13C values of up to 1.6 per mil at intermediate depths near the Strait of Gibraltar (36°N). The values decrease to the south as evidenced by our data, but also to the north as revealed by data of intermediate depth cores north of 38°N (in Duplessy et al. (1987)). Thus, the distribution pattern of delta13C provides crucial evidence for an increased influence of nutrient depleted Mediterranean Outflow Water (MOW) on the glacial northeast Atlantic hydrography. During oxygen isotope Terminations I and II, the meridional carbon isotope gradient indicates a significantly decreased but still active MOW. As deduced from the delta18O fluctuations, the temperatures of the MOW in the Atlantic were lower during glacial times by as much as 5°C. During glacial times and during Termination I the maximum delta13C values of the MOW correlate with minimum values of the North Atlantic Deep Water (NADW) and vice versa. This inverse response to climatic change of the carbon isotope signals of both water masses indicates, that the supply of saline MOW to the north Atlantic may be less important for the formation of NADW than previously assumed. |
| title | Age determination of sediment cores close to the Strait of Gibralta |
| topic | Atlantic Ocean; GIK15666-6; GIK15669-1; GIK15670-5; GIK16004-1; GIK16006-1; GIK16017-2; Gravity corer (Kiel type); KOL; M53; M53_166; M53_169; M53_170; M60; Meteor (1964); off West Africa; Piston corer (Kiel type); SL; SUBTROPEX 82 |
| url | https://doi.org/10.1594/PANGAEA.725956 |