Diatom and hydrocarbon analysis of sediment core NBP00-03-JPC38
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PANGAEA
2016
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| author | Barbara, Loïc Crosta, Xavier Leventer, Amy Schmidt, S Étourneau, Johan Domack, Eugene W Massé, Guillaume |
| author_facet | Barbara, Loïc Crosta, Xavier Leventer, Amy Schmidt, S Étourneau, Johan Domack, Eugene W Massé, Guillaume |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In this study, we present a unique high-resolution Holocene record of oceanographic and climatic change based on analyses of diatom assemblages combined with biomarker data from a sediment core collected from the Vega Drift, eastern Antarctic Peninsula (EAP). These data add to the climate framework already established by high-resolution marine sedimentary records from the Palmer Deep, western Antarctic Peninsula (WAP). Heavy sea ice conditions and reduced primary productivity were observed prior to 7.4 ka B.P. in relation with the proximity of the glacial ice melt and calving. Subsequent Holocene oceanographic conditions were controlled by the interactions between the Westerlies-Antarctic Circumpolar Current (ACC)-Weddell Gyre dynamics. A warm period characterized by short seasonal sea ice duration associated with a southern shift of both ACC and Westerlies field persisted until 5 ka B.P. This warm episode was then followed by climate deterioration during the middle-to-late Holocene (5 to 1.9 ka B.P.) with a gradual increase in annual sea ice duration triggered by the expansion of the Weddell Gyre and a strong oceanic connection from the EAP to the WAP. Increase of benthic diatom species during this period was indicative of more summer/autumn storms, which was consistent with changes in synoptic atmospheric circulation and the establishment of low- to high-latitude teleconnections. Finally, the multicentennial scale variability of the Weddell Gyre intensity and storm frequency during the late Holocene appeared to be associated with the increased El Niño-Southern Oscillation frequency. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_858524 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Diatom and hydrocarbon analysis of sediment core NBP00-03-JPC38 Barbara, Loïc Crosta, Xavier Leventer, Amy Schmidt, S Étourneau, Johan Domack, Eugene W Massé, Guillaume Nathaniel B. Palmer; NBP0003; NBP0003-JPC38; PC; Piston corer; Vega Drift, Prince Gustav Channel, Antarctic Peninsula In this study, we present a unique high-resolution Holocene record of oceanographic and climatic change based on analyses of diatom assemblages combined with biomarker data from a sediment core collected from the Vega Drift, eastern Antarctic Peninsula (EAP). These data add to the climate framework already established by high-resolution marine sedimentary records from the Palmer Deep, western Antarctic Peninsula (WAP). Heavy sea ice conditions and reduced primary productivity were observed prior to 7.4 ka B.P. in relation with the proximity of the glacial ice melt and calving. Subsequent Holocene oceanographic conditions were controlled by the interactions between the Westerlies-Antarctic Circumpolar Current (ACC)-Weddell Gyre dynamics. A warm period characterized by short seasonal sea ice duration associated with a southern shift of both ACC and Westerlies field persisted until 5 ka B.P. This warm episode was then followed by climate deterioration during the middle-to-late Holocene (5 to 1.9 ka B.P.) with a gradual increase in annual sea ice duration triggered by the expansion of the Weddell Gyre and a strong oceanic connection from the EAP to the WAP. Increase of benthic diatom species during this period was indicative of more summer/autumn storms, which was consistent with changes in synoptic atmospheric circulation and the establishment of low- to high-latitude teleconnections. Finally, the multicentennial scale variability of the Weddell Gyre intensity and storm frequency during the late Holocene appeared to be associated with the increased El Niño-Southern Oscillation frequency. |
| title | Diatom and hydrocarbon analysis of sediment core NBP00-03-JPC38 |
| topic | Nathaniel B. Palmer; NBP0003; NBP0003-JPC38; PC; Piston corer; Vega Drift, Prince Gustav Channel, Antarctic Peninsula |
| url | https://doi.org/10.1594/PANGAEA.858524 |