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  • 293; Center for Marine Environmental Sciences; GeoB9508-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL  (2)
  • (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, δ13C; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, δ13C, standard deviation; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; ANT-XXXI/3; Bransfield Strait; Calculated; DEPTH, sediment/rock; Drake Passage; Elevation of event; Event label; Gas chromatography - Mass spectrometry (GC-MS); GBG; GC; Giant box corer; Giant box grab; GKG; Gravity corer; Latitude of event; Longitude of event; MUC; MultiCorer; Phytoplankton biomarker Brassicasterol IPSO25 index; Phytoplankton biomarker Dinosterol IPSO25 index; Phytoplankton biomarker HBI E-Triene IPSO25 index; Phytoplankton biomarker HBI Z-Triene IPSO25 index; Polarstern; PS97; PS97/042-1; PS97/044-1; PS97/045-1; PS97/046-6; PS97/048-1; PS97/049-2; PS97/052-3; PS97/053-1; PS97/054-2; PS97/056-1; PS97/059-1; PS97/060-1; PS97/061-1; PS97/062-1; PS97/065-2; PS97/067-2; PS97/068-2; PS97/069-1; PS97/072-2; PS97/073-2; PS97/074-1; PS97/077-1; PS97/079-1; PS97/080-2; PS97/083-1; PS97/084-2; Satellite derived; Scotia Sea; Sea ice concentration, autumn; Sea ice concentration, autumn, standard deviation; Sea ice concentration, spring; Sea ice concentration, spring, standard deviation; Sea ice concentration, summer; Sea ice concentration, summer, standard deviation; Sea ice concentration, winter; Sea ice concentration, winter, standard deviation  (1)
  • Pleistocene
Publikationsart
Schlagwörter
Verlag/Herausgeber
Sprache
Erscheinungszeitraum
  • 1
    Buch
    Buch
    Paleo-environmental effects of the Mid-Pleistocene transition in the tropical Atlantic and equatorial Africa : = Mileu-veranderingen in de tropische Atlantische Oceaan en equatoriaal Afrika tijdens de Midden-Pleistocene klimaatsovergang (2003)
    Utrecht : Univ.
    Details Verfügbarkeit
    Schlagwort(e): climate change ; Dissertation ; Pleistocene ; environmental change ; Atlantic Ocean ; Africa ; Hochschulschrift ; Paläoklimatologie ; Mittelpleistozän ; Tropenklima ; Atlantischer Ozean Süd ; Zentralafrika
    Materialart: Buch
    Seiten: 187 S , graph. Darst., Kt
    ISBN: 9057440814
    Serie: Geologica Ultraiectina 223
    Sprache: Englisch
    Anmerkung: Zsfassung in niederländ. und dt. Sprache , Zugl.: Utrecht, Univ., Diss., 2003
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    Pollen analyses of sediment core GeoB9508-5 (2012)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Prange, Matthias; Schefuß, Enno; Dupont, Lydie M; Lippold, Jörg; Mulitza, Stefan; Zonneveld, Karin A F (2012): Sahel megadrought during Heinrich Stadial 1: evidence for a three-phase evolution of the low- and mid-level West African wind system. Quaternary Science Reviews, 58, 66-76, https://doi.org/10.1016/j.quascirev.2012.10.015
    Details
    Publikationsdatum: 2023-06-27
    Beschreibung: Millennial-scale dry events in the Northern Hemisphere monsoon regions during the last Glacial period are commonly attributed to southward shifts of the Intertropical Convergence Zone (ITCZ) associated with an intensification of the northeasterly (NE) trade wind system during intervals of reduced Atlantic meridional overturning circulation (AMOC). Through the use of high-resolution last deglaciation pollen records from the continental slope off Senegal, our data show that one of the longest and most extreme droughts in the western Sahel history, which occurred during the North Atlantic Heinrich Stadial 1 (HS1), displayed a succession of three major phases. These phases progressed from an interval of maximum pollen representation of Saharan elements between ~19 and 17.4 kyr BP indicating the onset of aridity and intensified NE trade winds, followed by a millennial interlude of reduced input of Saharan pollen and increased input of Sahelian pollen, to a final phase between ~16.2 and 15 kyr BP that was characterized by a second maximum of Saharan pollen abundances. This change in the pollen assemblage indicates a mid-HS1 interlude of NE trade wind relaxation, occurring between two distinct trade wind maxima, along with an intensified mid-tropospheric African Easterly Jet (AEJ) indicating a substantial change in West African atmospheric processes. The pollen data thus suggest that although the NE trades have weakened, the Sahel drought remained severe during this time interval. Therefore, a simple strengthening of trade winds and a southward shift of the West African monsoon trough alone cannot fully explain millennial-scale Sahel droughts during periods of AMOC weakening. Instead, we suggest that an intensification of the AEJ is needed to explain the persistence of the drought during HS1. Simulations with the Community Climate System Model indicate that an intensified AEJ during periods of reduced AMOC affected the North African climate by enhancing moisture divergence over the West African realm, thereby extending the Sahel drought for about 4000 years.
    Schlagwort(e): 293; Center for Marine Environmental Sciences; GeoB9508-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Materialart: Dataset
    Format: application/zip, 5 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
    facet.materialart.
    Unbekannt
    Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal
    PANGAEA
    In:  Supplement to: Niedermeyer, Eva M; Schefuß, Enno; Sessions, Alex L; Mulitza, Stefan; Mollenhauer, Gesine; Schulz, Michael; Wefer, Gerold (2010): Orbital- and millennial-scale changes in the hydrologic cycle and vegetation in the western African Sahel: Insights from individual plant wax delta D and d13C. Quaternary Science Reviews, 29(23-24), 2996-3005, https://doi.org/10.1016/j.quascirev.2010.06.039
    Details
    Publikationsdatum: 2023-06-27
    Beschreibung: To reconstruct variability of the West African monsoon and associated vegetation changes on precessional and millennial time scales, we analyzed a marine sediment core from the continental slope off Senegal spanning the past 44,000 years (44 ka). We used the stable hydrogen isotopic composition (dD) of individual terrestrial plant wax n-alkanes as a proxy for past rainfall variability. The abundance and stable carbon isotopic composition (d13C) of the same compounds were analyzed to assess changes in vegetation composition (C3/C4 plants) and density. The dD record reveals two wet periods that coincide with local maximum summer insolation from 38 to 28 ka and 15 to 4 ka and that are separated by a less wet period during minimum summer insolation. Our data indicate that rainfall intensity during the rainy season throughout both wet humid periods was similar, whereas the length of the rainy season was presumably shorter during the last glacial than during the Holocene. Additional dry intervals are identified that coincide with North Atlantic Heinrich stadials and the Younger Dryas interval, indicating that the West African monsoon over tropical northwest Africa is linked to both insolation forcing and high-latitude climate variability. The d13C record indicates that vegetation of the western Sahel was consistently dominated by C4 plants during the past 44 ka, whereas C3-type vegetation increased during the Holocene. Moreover, we observe a gradual ending of the Holocene humid period together with unchanging ratio of C3 to C4 plants, indicating that an abrupt aridification due to vegetation feedbacks is not a general characteristic of this time interval.
    Schlagwort(e): 293; Center for Marine Environmental Sciences; GeoB9508-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Materialart: Dataset
    Format: application/zip, 5 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Unbekannt
    Highly branched isoprenoids and sterols in surface sedimentsfrom southern Drake Passage and the Bransfield Strait, Antarctic Peninsula, sampled during POLARSTERN cruise PS97 (ANT-XXXI/3) (2019)
    PANGAEA
    Details
    Publikationsdatum: 2023-06-27
    Schlagwort(e): (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, δ13C; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, δ13C, standard deviation; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; ANT-XXXI/3; Bransfield Strait; Calculated; DEPTH, sediment/rock; Drake Passage; Elevation of event; Event label; Gas chromatography - Mass spectrometry (GC-MS); GBG; GC; Giant box corer; Giant box grab; GKG; Gravity corer; Latitude of event; Longitude of event; MUC; MultiCorer; Phytoplankton biomarker Brassicasterol IPSO25 index; Phytoplankton biomarker Dinosterol IPSO25 index; Phytoplankton biomarker HBI E-Triene IPSO25 index; Phytoplankton biomarker HBI Z-Triene IPSO25 index; Polarstern; PS97; PS97/042-1; PS97/044-1; PS97/045-1; PS97/046-6; PS97/048-1; PS97/049-2; PS97/052-3; PS97/053-1; PS97/054-2; PS97/056-1; PS97/059-1; PS97/060-1; PS97/061-1; PS97/062-1; PS97/065-2; PS97/067-2; PS97/068-2; PS97/069-1; PS97/072-2; PS97/073-2; PS97/074-1; PS97/077-1; PS97/079-1; PS97/080-2; PS97/083-1; PS97/084-2; Satellite derived; Scotia Sea; Sea ice concentration, autumn; Sea ice concentration, autumn, standard deviation; Sea ice concentration, spring; Sea ice concentration, spring, standard deviation; Sea ice concentration, summer; Sea ice concentration, summer, standard deviation; Sea ice concentration, winter; Sea ice concentration, winter, standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 445 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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