Sökning: "foraminifera"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet foraminifera.

  1. 1. Arctic Ocean benthic foraminifera preservation and Mg/Ca ratios : Implications for bottom water palaeothermometry

    Författare :Natalia Barrientos; Helen Coxall; Martin Jakobsson; Steve Barker; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; benthic foraminifera; Mg Ca-temperature; calcite preservation; maringeologi; Marine Geology;

    Sammanfattning : Reconstructions of Arctic Ocean palaeotemperatures are needed to disentangle natural variability from anthropogenic changes and understand the role of ocean heat transport in forcing or providing feedbacks on Arctic climate change. Despite known complications with calcareous microfossil preservation in Arctic Ocean sediments, calcareous benthic foraminifera can be common in interglacial sequences. LÄS MER

  2. 2. DISCO - Drivers and Impacts of Coastal Ocean Acidification

    Författare :Laurie Charrieau; Kvartärgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Coastal ocean acidification; Foraminifera; Environmental changes; pH; Salinity;

    Sammanfattning : Ocean acidification, mainly attributed to the increasing anthropogenic CO2 in the atmosphere, is characterised by a lowering pH together with a shift in the sea water carbonate chemistry toward lower concentration of carbonate ions. On the coasts, where the environmental variability is high due to natural and human impacts, ocean acidification mainly affects the frequency, magnitude, and duration of lower pH and lower calcium carbonate saturation events. LÄS MER

  3. 3. Late Quaternary Biostratigraphy and Paleoceanography of the central Arctic Ocean

    Författare :Daniela Hanslik; Martin Jakobsson; Marit-Solveig Seidenkrantz; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; Quaternary; biostratigraphy; foraminifera; paleoceanography; Other earth sciences; Övrig geovetenskap; Marine Geoscience; marin geovetenskap;

    Sammanfattning : The central Arctic Ocean is one of the least explored deep sea regions and long biostratigraphic sediment records are sparse. The main focus of this thesis is the Arctic Ocean foraminiferal record and its application to reconstruct paleoceanographic variations and summer sea ice cover changes between late Quaternary interglacial periods. LÄS MER

  4. 4. Tracing marine hypoxic conditions during warm periods using a microanalytical approach

    Författare :Sha Ni; Centrum för miljö- och klimatforskning (CEC); []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; environmental changes; hypoxia; foraminifera; Eemian; Holocene; trace elements; stable isotopes; LA-ICP-MS; synchrotronbased μXRF;

    Sammanfattning : Deoxygenation, i.e. loss of oxygen from the oceans, often considerably influences the aquatic organisms and the wholeecosystem and changes biogeochemical cycles. It results in increasing bottom areas of hypoxia (. LÄS MER

  5. 5. Late Neogene Benthic Foraminifera from the Caribbean Sea and Eastern Equatorial Pacific Ocean

    Författare :Lennart Bornmalm; Göteborgs universitet; Göteborgs universitet; Gothenburg University; Göteborgs universitet; Gothenburg University; []
    Nyckelord :; Benthic Foraminifera; Caribbean Sea; Eastern Equatorial Pacific Ocean;

    Sammanfattning : .... LÄS MER