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  • 1
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    Recent and subrecent agglutinated forminifers in four box cores from the Skagerrak (NE North Sea) (1997)
    Grzybowski Foundation
    In:  In: Contributions to the micropaleontology and paleoceanography of the northern North Atlantic (collected results from the GEOMAR Bungalow Working Group). , ed. by Hass, H. C. and Kaminski, M. A. Grzybowski Foundation, Krakow, pp. 217-226.
    Details
    Publication Date: 2016-01-19
    Description: Agglutinated foraminifers from 4 box cores spanning the past ca. 140 years (maximum) taken from the southern flank of the Skagerrak (NE North Sea) were studied. Fourtyseven species were identified, among them Liebusella goesi, Eggerelloides spp., Rhabdammina discreta, and Haplophragmoides bradyi are the most common. The two more westerly locations reveal significantly higher amounts of agglutinated foraminifers, which may be caused by a better supply of suitable food provided by east headed bottom currents. Extremely high sedimentation rates and a higher degree of pollution suggest environmental stress that may be one reason for lower amounts of agglutinated foraminifers at the two more easterly stations close to the Skagerrak deep. Increasing numbers of specimens within the present century suggests a combination of instability of the tests and ecological controls.
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 2
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    The benthic foraminiferal response to late Holocene climate change over northern Europe (1997)
    Grzybowski Foundation
    In:  In: Contributions to the micropaleontology and paleoceanography of the northern North Atlantic (collected results from the GEOMAR Bungalow Working Group). , ed. by Hass, H. C. and Kaminski, M. A. Grzybowski Foundation, Krakow, pp. 199-216.
    Details
    Publication Date: 2016-01-19
    Description: Calcareous benthic foraminifera from four cores from the southern flank of the Skagerrak (NE North Sea) were investigated in order to estimate the response of this fossil group to climate fluctuations during the upper part of the Holocene. Q-mode factor analyses were carried out for the most abundant taxa. The results reveal C. laeuigata, H. baltllica, M. barleeanus, G. turgida, B. mal;yirintn, and U. yeregrirtn as most conm~on/importantta xa. In the upper part of all cores B. skagerrakensis shows a significant increase and dominates the foraminifer fauna in cores from greater water depth. The data suggest no direct relation between the fluctuations of foraminifer assemblages and climate change. However, climate forced fluctuations in the strength of the water-circulation caused considerable changes in the foraminifer assemblages. Three major assemblages were used for environmental analysis: H. baltlticn dominated assemblages were identified as indicators for stagnant conditions. They characterize the oldest core sections, most probably the Holocene climate optimum. Cassidl~linala euigata assemblages seem to indicate increasing current strength, a process that is often associated with deteriorating climatic conditions. Briznlirtn skaCqcrrnkensis appears to have a certain relation to unstable water masses, and probably a tolerance for increasing polution of the North Sea since the advent of modern industrialization.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 3
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    Glacial melting: an overlooked threat to Antarctic krill (2016)
    Nature Research
    In:  Scientific Reports, 6 (27234).
    Details
    Publication Date: 2019-06-11
    Description: Strandings of marine animals are relatively common in marine systems. However, the underlying mechanisms are poorly understood. We observed mass strandings of krill in Antarctica that appeared to be linked to the presence of glacial meltwater. Climate-induced glacial meltwater leads to an increased occurrence of suspended particles in the sea, which is known to affect the physiology of aquatic organisms. Here, we study the effect of suspended inorganic particles on krill in relation to krill mortality events observed in Potter Cove, Antarctica, between 2003 and 2012. The experimental results showed that large quantities of lithogenic particles affected krill feeding, absorption capacity and performance after only 24 h of exposure. Negative effects were related to both the threshold concentrations and the size of the suspended particles. Analysis of the stomach contents of stranded krill showed large quantities of large particles ( 〉 106 μm3), which were most likely mobilized by glacial meltwater. Ongoing climate-induced glacial melting may impact the coastal ecosystems of Antarctica that rely on krill.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: video
    DOI: 10.1038/srep27234
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years (2021)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: The Antarctic Circumpolar Current (ACC) plays a crucial role in global ocean circulation by fostering deep-water upwelling and formation of new water masses. On geological time-scales, ACC variations are poorly constrained beyond the last glacial. Here, we reconstruct changes in ACC strength in the central Drake Passage in vicinity of the modern Polar Front over a complete glacial-interglacial cycle (i.e., the past 140,000 years), based on sediment grain-size and geochemical characteristics. We found significant glacial-interglacial changes of ACC flow speed, with weakened current strength during glacials and a stronger circulation in interglacials. Superimposed on these orbital-scale changes are high-amplitude millennial-scale fluctuations, with ACC strength maxima correlating with diatom-based Antarctic winter sea-ice minima, particularly during full glacial conditions. We infer that the ACC is closely linked to Southern Hemisphere millennial-scale climate oscillations, amplified through Antarctic sea ice extent changes. These strong ACC variations modulated Pacific-Atlantic water exchange via the “cold water route” and potentially affected the Atlantic Meridional Overturning Circulation and marine carbon storage.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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