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  • Data  (3)
  • 2005-2009  (3)
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  • Data  (3)
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  • 1
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    PANGAEA
    In:  Supplement to: Sierro, Francisco Javier; Hodell, David A; Curtis, Jason H; Flores, José-Abel; Reguera, Maria Isabel; Colmenero-Hidalgo, Elena; Bárcena, María Angeles; Grimalt, Joan O; Cacho, Isabel; Frigola, Jaime; Canals, Miquel (2005): Impact of iceberg melting on Mediterranean thermohaline circulation during Heinrich events. Paleoceanography, 20(2), PA2019, https://doi.org/10.1029/2004PA001051
    Publication Date: 2023-07-20
    Description: Down-core samples of planktonic and benthic foraminifera were analyzed for oxygen and carbon isotopes in International Marine Past Global Changes Study (IMAGES) core MD99-2343 in order to study the interactions between climate change in the Northern Hemisphere and the western Mediterranean thermohaline circulation at times of Heinrich events (HE). Our results confirm the antiphase correlation between enhanced North Atlantic Deep Water formation and low ventilation in the Mediterranean. However, this study reveals that this antiphase relationship in deepwater formation between the North Atlantic and Mediterranean was interrupted during times of HE when the injection of large volumes of water from melting icebergs reached the entrance to the Mediterranean. These events, which lasted less than 1000 years, are represented by pronounced decreases in both planktonic d18O and benthic d13C signals. Lower salinities of Mediterranean surface water resulted in a slowdown of western Mediterranean deepwater overturn even though cold sea surface temperatures and drier climate should have resulted in enhanced deepwater formation.
    Keywords: 98; Age, 14C AMS; Age, comment; Age, dated; Age, dated standard deviation; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES V; Marion Dufresne (1995); MD114; MD99-2343; North Minorca
    Type: Dataset
    Format: text/tab-separated-values, 44 data points
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2024-02-16
    Keywords: Acanthoica spp.; Adriatic Sea; Bavenit; Braarudosphaera bigelowii; Calcidiscus leptoporus; Calciosolenia murrayi; Coccolithus pelagicus; DEPTH, sediment/rock; Discosphaera tubifer; DRILL; Drilling/drill rig; Emiliania huxleyi; Gephyrocapsa caribbeanica; Gephyrocapsa muellerae; Gephyrocapsa oceanica; Gephyrocapsa sp.; Helicosphaera spp.; Nannofossils, reworked fossil; Neosphaera coccolithomorpha; Pontosphaera spp.; PRAD1-2; Profiles across Mediterranean Sedimentary Systems; PROMESS; PROMESS1; Pseudoemiliania lacunosa; Reticulofenestra sp.; Rhabdosphaera clavigera; Sample code/label; SESAME; Smear slide analysis; Southern European Seas: Assessing and Modelling Ecosystem Changes; Syracosphaera spp.; Umbellosphaera spp.; Umbilicosphaera spp.
    Type: Dataset
    Format: text/tab-separated-values, 682 data points
    Location Call Number Limitation Availability
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  • 3
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    Unknown
    PANGAEA
    In:  Supplement to: Iglesias-Rodriguez, Debora; Halloran, P R; Rickaby, Rosalind E M; Hall, Ian R; Colmenero-Hidalgo, Elena; Gittins, J R; Green, Darryl R H; Tyrrell, Toby; Gibbs, Samantha J; von Dassow, Peter; Rehm, E; Armbrust, E Virginia; Boessenkool, K P (2008): Phytoplankton calcification in a high-CO2 world. Science, 320(5874), 336-340, https://doi.org/10.1126/science.1154122
    Publication Date: 2024-05-27
    Description: Ocean acidification in response to rising atmospheric CO2 partial pressures is widely expected to reduce calcification by marine organisms. From the mid-Mesozoic, coccolithophores have been major calcium carbonate producers in the world's oceans, today accounting for about a third of the total marine CaCO3 production. Here, we present laboratory evidence that calcification and net primary production in the coccolithophore species Emiliania huxleyi are significantly increased by high CO2 partial pressures. Field evidence from the deep ocean is consistent with these laboratory conclusions, indicating that over the past 220 years there has been a 40% increase in average coccolith mass. Our findings show that coccolithophores are already responding and will probably continue to respond to rising atmospheric CO2 partial pressures, which has important implications for biogeochemical modeling of future oceans and climate.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate of calcium carbonate per algae cell; Calcite saturation state; Calcium carbonate in cell; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate, production per cell; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Counting; Element analyser, Thermo Finnigan flash EA 1112; Emiliania huxleyi; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Flow cytometry; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Pelagos; pH; Phytoplankton; Potentiometric titration, VINDTA (marianda); Primary production/Photosynthesis; Salinity; Single species; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1237 data points
    Location Call Number Limitation Availability
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