Coccolithophore assemblage and palaeoproductivity proxies at sediment cores PS75/076-2 and PS75/079-2
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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2017
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| _version_ | 1867170471782383616 |
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| author | Saavedra-Pellitero, Mariem Baumann, Karl-Heinz Lamy, Frank Köhler, Peter |
| author_facet | Saavedra-Pellitero, Mariem Baumann, Karl-Heinz Lamy, Frank Köhler, Peter |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Proxy-based reconstructions of past changes in the marine biological carbon pumps are limited, especially in the Southern Ocean. This work provides new insights into the productivity variations in the Pacific sector of the Southern Ocean. We present new data derived from three sediment cores that show glacial/interglacial coccolithophore variability across Marine Isotope Stage 11 (MIS 11). The cores were retrieved during R/V Polarstern cruise PS75 from the Subantarctic and Polar Front Zones at the western flank of the East Pacific Rise and in the vicinity of the Antarctic-Pacific Ridge. Coccolithophore assemblages were overwhelmingly dominated by the species Gephyrocapsa caribbeanica and small Gephyrocapsa. Total numbers of coccoliths, coccolith accumulation rates, coccolith fraction (CF; <20 µm-fraction) Sr/Ca data and temperature-corrected CF Sr/Ca records consistently showed an increase in coccolithophore productivity during Termination V (MIS 12-11 boundary), highest productivity throughout MIS 11 (424-374 kyr), and a decrease during late MIS 11 in all the cores. We end with a discussion of back-calculated coccolith calcification rate in the surface ocean and its potential contribution to changes in the concentration of atmospheric CO2. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_878116 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Coccolithophore assemblage and palaeoproductivity proxies at sediment cores PS75/076-2 and PS75/079-2 Saavedra-Pellitero, Mariem Baumann, Karl-Heinz Lamy, Frank Köhler, Peter Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158 Proxy-based reconstructions of past changes in the marine biological carbon pumps are limited, especially in the Southern Ocean. This work provides new insights into the productivity variations in the Pacific sector of the Southern Ocean. We present new data derived from three sediment cores that show glacial/interglacial coccolithophore variability across Marine Isotope Stage 11 (MIS 11). The cores were retrieved during R/V Polarstern cruise PS75 from the Subantarctic and Polar Front Zones at the western flank of the East Pacific Rise and in the vicinity of the Antarctic-Pacific Ridge. Coccolithophore assemblages were overwhelmingly dominated by the species Gephyrocapsa caribbeanica and small Gephyrocapsa. Total numbers of coccoliths, coccolith accumulation rates, coccolith fraction (CF; <20 µm-fraction) Sr/Ca data and temperature-corrected CF Sr/Ca records consistently showed an increase in coccolithophore productivity during Termination V (MIS 12-11 boundary), highest productivity throughout MIS 11 (424-374 kyr), and a decrease during late MIS 11 in all the cores. We end with a discussion of back-calculated coccolith calcification rate in the surface ocean and its potential contribution to changes in the concentration of atmospheric CO2. |
| title | Coccolithophore assemblage and palaeoproductivity proxies at sediment cores PS75/076-2 and PS75/079-2 |
| topic | Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158 |
| url | https://doi.org/10.1594/PANGAEA.878116 |