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Datasets with PANGAEA technical keyword @mollenhauer2002a

Mostrando recursos 1 - 20 de 27

  1. High resolution study of sediment core GeoB3606-1

    Romero, Oscar E; Mollenhauer, Gesine; Schneider, Ralph R; Wefer, Gerold
    Based on a high-resolution analysis of the diatom signal and biogenic bulk components at site GeoB3606-1 (25°S, off Namibia), we describe rapid palaeoceanographic changes in the Benguela Upwelling System (BUS) from early MIS 3 through to the early Holocene (55 000 to 7 000 14C yr BP). Coastal upwelling strongly varied at 25°S from MIS 3 through to MIS 2. The abrupt decrease in the accumulation rate of biogenic silica and diatoms from MIS 3 into MIS 2 records rapid oceanographic changes in the BUS off Namibia. During MIS 3, leakage of excess H4SiO4 acid from the Southern Ocean into...

  2. Alkenone and foraminifera records from sediment samples off Namibia

    Mollenhauer, Gesine; Eglinton, Timothy I; Ohkouchi, Naohiko; Schneider, Ralph R; Müller, Peter J; Grootes, Pieter Meiert; Rullkötter, Jürgen
    Radiocarbon stratigraphy is an essential tool for high resolution paleoceanographic studies. Age models based on radiocarbon ages of foraminifera are commonly applied to a wide range of geochemical studies, including the investigation of temporal leads and lags. The critical assumption is that temporal coupling between foraminifera and other sediment constituents, including specific molecular organic compounds (biomarkers) of marine phytoplankton, e.g. alkenones, is maintained in the sediments. To test this critical assumption in the Benguela upwelling area, we have determined radiocarbon ages of total C37-C39 alkenones in 20 samples from two gravity cores and three multicorer cores. The cores were retrieved from...

  3. Conventional radiocarbon age data of sediment core IOW226920-2

    Mollenhauer, Gesine

  4. Fine fraction carbonate conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  5. Fatty acid conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  6. Bulk organic carbon conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  7. Bulk organic carbon conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  8. Alkenone conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  9. Foraminifera conventional radiocarbon age data of sediment core IOW226920-3

    Mollenhauer, Gesine

  10. TOC, CaCO3 and C/N ratio of sediment core IOW226920-3

    Mollenhauer, Gesine; Müller, Peter J

  11. TOC, CaCO3 and C/N ratio of sediment core IOW226660-5

    Mollenhauer, Gesine; Müller, Peter J

  12. UK37 and alkenone sea surface temperatures of sediment core IOW226660-5

    Mollenhauer, Gesine; Müller, Peter J

  13. Fatty acid conventional radiocarbon age data of sediment core IOW226660-5

    Mollenhauer, Gesine

  14. Bulk organic carbon conventional radiocarbon age data of sediment core IOW226660-5 (Table 4)

    Mollenhauer, Gesine

  15. Bulk organic carbon conventional radiocarbon age data of sediment core IOW226660-5 (Table 3)

    Mollenhauer, Gesine

  16. Alkenone conventional radiocarbon age data of sediment core IOW226660-5

    Mollenhauer, Gesine

  17. Foraminifera conventional radiocarbon age data of sediment core IOW226660-5

    Mollenhauer, Gesine

  18. Radiocarbon (14C) age data and corrections of sediment core GeoB3722-2

    Mollenhauer, Gesine

  19. Radiocarbon (14C) AMS dating of sediment core GeoB3606-1

    Romero, Oscar E; Mollenhauer, Gesine; Schneider, Ralph R; Wefer, Gerold

  20. UK37 and alkenone sea surface temperatures of sediment core IOW226920-3

    Mollenhauer, Gesine; Müller, Peter J

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