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  • 64PE229; Age, relative; Age, standard deviation; Belgica area off Morocco; Center for Marine Environmental Sciences; Comment of event; Coral; DEPTH, sediment/rock; Event label; Faro/Almazan mud volcano; GAP; GC; GC25; GC27; GC35; GC36; GC44; GeoB9018-1; GeoB9031-1; GeoB9032-1; GeoB9070-1; Gravity corer; Gulf of Cádiz, Atlantic Ocean; HERMIONE; Hesperides mud volcano; Hotspot Ecosystem Research and Mans Impact On European Seas; Latitude of event; Longitude of event; M2004-02_PC; Maria S. Merian; MARUM; Moundforce 2004; MSM01/3; MSM01/3_254; MSM01/3_257; MSM01/3_292; MSM01/3_293; MSM01/3_325; PC; Pelagia; Piston corer; SO175; Sonne; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation  (1)
  • Benguela; Celtic_Sea; Center for Marine Environmental Sciences; GeoB; Geosciences, University of Bremen; MARUM; MUC; MultiCorer; North_Sea; North Sea; NW_Africa  (1)
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  • 1
    facet.materialart.
    Unknown
    Absolute abundances of dinoflagellate cysts in surface sediment samples from four sites: Lycopodium marker-grain method (2009)
    PANGAEA
    In:  Supplement to: Mertens, Kenneth Neil; Verhoeven, Koen; Verleye, Thomas; Louwye, Stephen; Amorim, Ana; Ribeiro, Sofia; Deaf, Amr S; Harding, Ian C; De Schepper, Stijn; González, Catalina; Kodrans-Nsiah, Monika; de Vernal, Anne; Henry, Maryse; Radi, Taoufik; Dybkjaer, Karen; Poulsen, Niels E; Feist-Burkhardt, Susanne; Chitolie, Jonah; Heilmann-Clausen, Claus; Londeix, Laurent; Turon, Jean-Louis; Marret, Fabienne; Matthiessen, Jens; McCarthy, Francine M G; Prasad, Vandana; Pospelova, Vera; Hughes, Jane E Kyffin; Riding, James B; Rochon, André; Sangiorgi, Francesca; Welters, Natasja; Sinclair, Natalie; Thun, Christian; Soliman, Ali; Van Nieuwenhove, Nicolas; Vink, Annemiek; Young, Martin (2009): Determining the absolute abundance of dinoflagellate cysts in recent marine sediments: The Lycopodium marker-grain method put to the test. Review of Palaeobotany and Palynology, Review of Palaeobotany and Palynology, 157(3-4), 238-252, https://doi.org/10.1016/j.revpalbo.2009.05.004
    Details
    Publication Date: 2024-02-02
    Description: Absolute abundances (concentrations) of dinoflagellate cysts are often determined through the addition of Lycopodium clavatum marker-grains as a spike to a sample before palynological processing. An inter-laboratory calibration exercise was set up in order to test the comparability of results obtained in different laboratories, each using its own preparation method. Each of the 23 laboratories received the same amount of homogenized splits of four Quaternary sediment samples. The samples originate from different localities and consisted of a variety of lithologies. Dinoflagellate cysts were extracted and counted, and relative and absolute abundances were calculated. The relative abundances proved to be fairly reproducible, notwithstanding a need for taxonomic calibration. By contrast, excessive loss of Lycopodium spores during sample preparation resulted in non-reproducibility of absolute abundances. Use of oxidation, KOH, warm acids, acetolysis, mesh sizes larger than 15 µm and long ultrasonication (〉 1 min) must be avoided to determine reproducible absolute abundances. The results of this work therefore indicate that the dinoflagellate cyst worker should make a choice between using the proposed standard method which circumvents critical steps, adding Lycopodium tablets at the end of the preparation and using an alternative method.
    Keywords: Benguela; Celtic_Sea; Center for Marine Environmental Sciences; GeoB; Geosciences, University of Bremen; MARUM; MUC; MultiCorer; North_Sea; North Sea; NW_Africa
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Glacial cold-water coral: ages, isotope concentrations and ratios (2011)
    PANGAEA
    In:  Supplement to: Wienberg, Claudia; Frank, Norbert; Mertens, Kenneth Neil; Stuut, Jan-Berend W; Marchant, Margarita; Fietzke, Jan; Mienis, Furu; Hebbeln, Dierk (2010): Glacial cold-water corals growth in the Gulf of Cádiz: Implications of increased palaeo-productivity. Earth and Planetary Science Letters, 298, 405-416, https://doi.org/10.1016/j.epsl.2010.08.017
    Details
    Publication Date: 2024-04-18
    Description: A set of 40 Uranium-series datings obtained on the reef-forming scleractinian cold-water corals Lophelia pertusa and Madrepora oculata revealed that during the past 400 kyr their occurrence in the Gulf of Cádiz (GoC) was almost exclusively restricted to glacial periods. This result strengthens the outcomes of former studies that coral growth in the temperate NE Atlantic encompassing the French, Iberian and Moroccan margins dominated during glacial periods, whereas in the higher latitudes (Irish and Norwegian margins) extended coral growth prevailed during interglacial periods. Thus it appears that the biogeographical limits for sustained cold-water coral growth along the NE Atlantic margin are strongly related to climate change. By focussing on the last glacial-interglacial cycle, this study shows that palaeo-productivity was increased during the last glacial. This was likely driven by the fertilisation effect of an increased input of aeolian dust and locally intensified upwelling. After the Younger Dryas cold event, the input of aeolian dust and productivity significantly decreased concurrent with an increase in water temperatures in the GoC. This primarily resulted in reduced food availability and caused a widespread demise of the formerly thriving coral ecosystems. Moreover, these climate induced changes most likely caused a latitudinal shift of areas withoptimum coral growth conditions towards the northern NE Atlantic where more suitable environmental conditions established with the onset of the Holocene.
    Keywords: 64PE229; Age, relative; Age, standard deviation; Belgica area off Morocco; Center for Marine Environmental Sciences; Comment of event; Coral; DEPTH, sediment/rock; Event label; Faro/Almazan mud volcano; GAP; GC; GC25; GC27; GC35; GC36; GC44; GeoB9018-1; GeoB9031-1; GeoB9032-1; GeoB9070-1; Gravity corer; Gulf of Cádiz, Atlantic Ocean; HERMIONE; Hesperides mud volcano; Hotspot Ecosystem Research and Mans Impact On European Seas; Latitude of event; Longitude of event; M2004-02_PC; Maria S. Merian; MARUM; Moundforce 2004; MSM01/3; MSM01/3_254; MSM01/3_257; MSM01/3_292; MSM01/3_293; MSM01/3_325; PC; Pelagia; Piston corer; SO175; Sonne; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 356 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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