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  • Data  (2)
  • 175-1079A; 175-1084A; Benguela Current, South Atlantic Ocean; Center for Marine Environmental Sciences; Congo Fan; DRILL; Drilling/drill rig; GeoB6518-1; Gravity corer (Kiel type); Joides Resolution; Leg175; M47/3; MARUM; Meteor (1986); Ocean Drilling Program; ODP; SL  (1)
  • 175-1081A; Acomosphaera spp.; AGE; Ataxiodinium confusum; Ataxiodinium zevenboomii; Batiacasphaera hirsuta; Batiacasphaera micropapillata; Benguela Current, South Atlantic Ocean; Brigantedinium spp.; Counting, dinoflagellate cysts; DEPTH, sediment/rock; Dinoflagellate cyst indeterminata; Dinoflagellates, total; DRILL; Drilling/drill rig; Habibacysta tectata; Impagidinium aculeatum; Impagidinium paradoxum; Impagidinium patulum; Impagidinium species 2 after De Schepper & Head (2009); Impagidinium sphaericum; Impagidinium spp.; Impagidinium strialatum; Joides Resolution; Leg175; Lejeunecysta oliva; Lejeunecysta sabrina; Lejeunecysta spp.; Lingulodinium machaerophorum; Marker, added; Marker, found; Nematosphaeropsis labyrinthus; Ocean Drilling Program; ODP; Operculodinium centrocarpum; Operculodinium israelianum; Operculodinium janduchenei; Operculodinium spp.; Pentapharsodinium dalei; Pyxidinopsis reticulata; Quinquecuspis concreta; Sample code/label; Selenopemphix armageddonensis; Selenopemphix brevispinosa; Selenopemphix brevispinosa conspicua; Selenopemphix nephroides; Selenopemphix quanta; Spiniferites cf. mirabilis; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites ramosus; Spiniferites spp.; Sumatradinium soucouyantiae; Trinovantedinium applanatum; Trinovantedinium ferugnomatum; Trinovantedinium glorianum; Trinovantedinium papula; Tuberculodinium vancampoae; Volume  (1)
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  • Data  (2)
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Keywords
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  • 1
    facet.materialart.
    Unknown
    Dinoflagellate cyst counts of ODP Site 1081, Benguela Upwelling, Miocene-Pliocene (2016)
    PANGAEA
    In:  Supplement to: Hötzel, Sebastian; Dupont, Lydie M; Marret, Fabienne; Jung, Gerlinde; Wefer, Gerold (2016): Steps in the intensification of Benguela upwelling over the Walvis Ridge during Miocene and Pliocene. International Journal of Earth Sciences, 1-13, https://doi.org/10.1007/s00531-016-1309-0
    Details
    Publication Date: 2024-03-06
    Description: Using the Late Miocene to Pliocene organic-walled dinoflagellate cyst record of ODP Site 1081 we reconstruct and discuss the early upwelling history over the Walvis Ridge with a special focus on the movement of the Angola-Benguela Front (ABF). We suggest that during the Late Miocene the Angola Current flowed southwards over the Walvis Ridge more frequently than today because the ABF was probably located further south as a result of a weaker meridional temperature gradient. A possible strengthening of the meridional gradient during the latest Miocene to early Pliocene in combination with uplift of south-western Africa intensified the upwelling along the coast and increased the upwelling's filaments over the Walvis Ridge. An intermediate period from 6.2 to 5.5 Ma is shown by the dominance of Habibacysta tectata, cysts of a cool-tolerant dinoflagellate known from the northern Atlantic, indicating changing oceanic conditions contemporaneous with the Messinian Salinity Crisis. From 4.3 Ma on, the upwelling signal got stronger again and waters were well-mixed and nutrient-rich. Our results indicate a northward migration of the ABF as early as 7 Ma and the initial stepwise intensification of the BUS.
    Keywords: 175-1081A; Acomosphaera spp.; AGE; Ataxiodinium confusum; Ataxiodinium zevenboomii; Batiacasphaera hirsuta; Batiacasphaera micropapillata; Benguela Current, South Atlantic Ocean; Brigantedinium spp.; Counting, dinoflagellate cysts; DEPTH, sediment/rock; Dinoflagellate cyst indeterminata; Dinoflagellates, total; DRILL; Drilling/drill rig; Habibacysta tectata; Impagidinium aculeatum; Impagidinium paradoxum; Impagidinium patulum; Impagidinium species 2 after De Schepper & Head (2009); Impagidinium sphaericum; Impagidinium spp.; Impagidinium strialatum; Joides Resolution; Leg175; Lejeunecysta oliva; Lejeunecysta sabrina; Lejeunecysta spp.; Lingulodinium machaerophorum; Marker, added; Marker, found; Nematosphaeropsis labyrinthus; Ocean Drilling Program; ODP; Operculodinium centrocarpum; Operculodinium israelianum; Operculodinium janduchenei; Operculodinium spp.; Pentapharsodinium dalei; Pyxidinopsis reticulata; Quinquecuspis concreta; Sample code/label; Selenopemphix armageddonensis; Selenopemphix brevispinosa; Selenopemphix brevispinosa conspicua; Selenopemphix nephroides; Selenopemphix quanta; Spiniferites cf. mirabilis; Spiniferites membranaceus; Spiniferites mirabilis; Spiniferites ramosus; Spiniferites spp.; Sumatradinium soucouyantiae; Trinovantedinium applanatum; Trinovantedinium ferugnomatum; Trinovantedinium glorianum; Trinovantedinium papula; Tuberculodinium vancampoae; Volume
    Type: Dataset
    Format: text/tab-separated-values, 3408 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Pollen analysis of sediment cores from the mouth of the river Congo to Walvis Bay and Lüderitz (2007)
    PANGAEA
    In:  Supplement to: Dupont, Lydie M; Behling, Hermann; Jahns, Susanne; Marret, Fabienne; Kim, Jung-Hyun (2007): Variability in glacial and Holocene marine pollen records offshore from west southern Africa. Vegetation History and Archaeobotany, 16, 87-100, https://doi.org/10.1007/s00334-006-0080-8
    Details
    Publication Date: 2024-02-02
    Description: The distribution of pollen in marine sediments is used to record vegetation changes over the past 30,000 years on the adjacent continent. A transect of marine pollen sequences from the mouth of the river Congo (~5°S) to Walvis Bay and Lüderitz (~25°S) shows vegetation changes in Congo, Angola and Namibia from the last glacial period into the Holocene. The comparison of pollen records from different latitudes provides information about the latitudinal shift of open forest and savannahs (Poaceae pollen), the extension of lowland forest (rain forest pollen) and Afromontane forest (Podocarpus pollen), and the position of the desert fringe (pollen of Caryophyllaceae, Chenopodiaceae and Amaranthaceae). High Cyperaceae pollen percentages in sediments from the last glacial period off the mouth of the river Congo suggest the presence of open swamps rather than savannah vegetation in the Congo Basin. Pollen from Restionaceae in combination with Stoebe-type pollen (probably from Elytropappus) indicates a possible northwards extension of winter rain vegetation during the last glacial period. The record of Rhizophora (mangrove) pollen is linked to erosion of the continental shelf and sea-level rise. Pollen influx is highest off river mouths (10-2000 grains year**-1 cm**-2), close to the coast (300-6000 grains year**-1 cm**-2), but is an order of magnitude lower at sites situated far from the continent (〈10 grains year**-1 cm**-2).
    Keywords: 175-1079A; 175-1084A; Benguela Current, South Atlantic Ocean; Center for Marine Environmental Sciences; Congo Fan; DRILL; Drilling/drill rig; GeoB6518-1; Gravity corer (Kiel type); Joides Resolution; Leg175; M47/3; MARUM; Meteor (1986); Ocean Drilling Program; ODP; SL
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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