Benthic oxygen isotope ratios from a transect of five gravity cores off NW Africa
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2018
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| _version_ | 1867171372516507648 |
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| author | Völpel, Rike Mulitza, Stefan Paul, André Lynch-Stieglitz, Jean Schulz, Michael |
| author_facet | Völpel, Rike Mulitza, Stefan Paul, André Lynch-Stieglitz, Jean Schulz, Michael |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Depth transects of benthic foraminiferal oxygen isotopes from the Atlantic Ocean show that glacial‐interglacial changes are larger at deep (> ~2000 m) than at intermediate water levels. Our model results suggest that the smaller changes in the upper 1000 m of the water column are a result of the glacial sea‐level lowering of about 120 m, leading to warmer temperatures of around 1 °C and hence a smaller glacial‐interglacial stable oxygen isotope difference. In contrast, a shoaling of the water‐mass boundary to ~2000 m water depth between the northern source and southern source water is accompanied by the expansion of a cold (close to the freezing point) southern source water in the abyssal ocean, increasing the oxygen isotope values of benthic foraminifera from the LGM in the deep Atlantic. These two effects explain the different amplitudes of glacial‐interglacial stable oxygen isotope differences in the upper and deeper water column of the Atlantic Ocean. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_894314 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Benthic oxygen isotope ratios from a transect of five gravity cores off NW Africa Völpel, Rike Mulitza, Stefan Paul, André Lynch-Stieglitz, Jean Schulz, Michael Center for Marine Environmental Sciences; MARUM Depth transects of benthic foraminiferal oxygen isotopes from the Atlantic Ocean show that glacial‐interglacial changes are larger at deep (> ~2000 m) than at intermediate water levels. Our model results suggest that the smaller changes in the upper 1000 m of the water column are a result of the glacial sea‐level lowering of about 120 m, leading to warmer temperatures of around 1 °C and hence a smaller glacial‐interglacial stable oxygen isotope difference. In contrast, a shoaling of the water‐mass boundary to ~2000 m water depth between the northern source and southern source water is accompanied by the expansion of a cold (close to the freezing point) southern source water in the abyssal ocean, increasing the oxygen isotope values of benthic foraminifera from the LGM in the deep Atlantic. These two effects explain the different amplitudes of glacial‐interglacial stable oxygen isotope differences in the upper and deeper water column of the Atlantic Ocean. |
| title | Benthic oxygen isotope ratios from a transect of five gravity cores off NW Africa |
| topic | Center for Marine Environmental Sciences; MARUM |
| url | https://doi.org/10.1594/PANGAEA.894314 |