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  • Other Sources  (51)
  • Inst. f. Geophys., Ruhr-Univ. Bochum  (30)
  • Nature Publishing Group  (14)
  • GEOMAR
  • Oxford Univ. Press
  • 1985-1989  (51)
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  • 1
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    The nucleotide sequences of the 5S rRNAs from the purple bacteria Ectothiorhodospira halophila and Ectothiorhodospira vacuolata (1987)
    Oxford Univ. Press
    In:  Nucleic Acids Research, 15 (1). p. 367.
    Details
    Publication Date: 2020-06-18
    Type: Article , PeerReviewed
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  • 2
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    Ice Edges and Seabird Occurrence in Antarctica (1986)
    American Institute of Biological Sciences | Oxford Univ. Press
    In:  BioScience, 36 (4). pp. 258-263.
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    Publication Date: 2020-06-16
    Type: Article , PeerReviewed
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  • 3
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    Seasonal succession of phytoplankton in Lake Constance (1985)
    American Institute of Biological Sciences | Oxford Univ. Press
    In:  BioScience, 5 . pp. 351-357.
    Details
    Publication Date: 2020-06-16
    Description: In Lake Constance, the phytoplankton growth season starts when stratification begins in spring. Initially, maximum growth rates are favored; later, as the water column stabilizes, zooplankton grazing and competition for nutrients become the dominant selective forces. When the mixing depth increases in autumn, algae that can tolerate low light are selected for. Temperature and sedimentation turn out to be less important in succession than traditionally assumed.
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  • 4
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    Densities of Antarctic Seabirds at Sea and the Presence of the Krill Euphausia superba (1985)
    Oxford Univ. Press
    In:  The Auk, 102 (3). pp. 540-549.
    Details
    Publication Date: 2020-05-13
    Description: The antarctic krill Euphausia superba forms abundant, well-organized schools in the waters off the Antarctic Peninsula. Mean avian density is 2.6 times greater in waters where krill schools are present than in waters without krill schools. Seabird density is a good predictor of the presence of krill. Seabird density did not correlate with krill density or krill school depth. Disoriented krill routinely were observed swimming near the surface above submerged schools, providing potential prey for surface-feeding birds. Responses of seabird species to the distribution of krill schools varied. The small to medium-size procellariiform species were the best indicators of krill schools; large procellariiforms and coastal species were poor indicators. Pygoscelis penguins occurred at high densities only in the presence of krill schools. These responses are consistent with the constraints imposed by the metabolic requirements and reproductive strategies of each of these groups. Krill schools were detected near the sea surface throughout the day. Correlations between seabird density and the presence of krill during daylight hours suggest that diurnal foraging is important to the seabirds of this region.
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  • 5
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    Laboratory studies on RNA/DNA ratios of starved and fed herring (Clupea harengus) and turbot (Scophthalmus maximus) larvae (1987)
    ICES | Oxford Univ. Press
    In:  Journal du Conseil / Conseil Permanent International pour l'Exploration de la Mer, 43 . pp. 122-128.
    Details
    Publication Date: 2019-08-08
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  • 6
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    Effects of microbe activity (1988)
    Nature Publishing Group
    In:  Nature, 333 (6168). pp. 17-18.
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    Publication Date: 2019-05-06
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  • 7
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    A Lagrangian mixed layer model of Atlantic 18 C water formation (1986)
    Nature Publishing Group
    In:  Nature, 319 . pp. 574-576.
    Details
    Publication Date: 2019-01-21
    Description: One of the most striking features of the upper North Atlantic Ocean is an extensive layer of water with temperature close to 18°C and salinity close to 36.5‰, (ref. 1). This 18°C water is formed by winter convection in the Sargasso sea2,3, but aspects of the annual rate of 18°C water formation remain obscure4. We have simulated this water mass formation by integrating a one-dimensional model along a 4-yr trajectory of a water column circulating around the Sargasso Sea. Winter convection is deep (≥200 m) in regions where the ocean suffers a net annual heat loss to the atmosphere, and shallow (≤lOOm) where the ocean gains heat each year. The origin of the thermostad (nearly isothermal layer) is a thick layer of nearly homogeneous water subducted beneath the seasonal boundary layer in the year that the water column passes through the line dividing annual cooling from annual heating. We estimate the annual production of 18°C water to be 446,000 km3 yr−1. Downstream, more stratified central water is formed each year at a rate that depends more on Ekman pumping (wind-forced convergence) than on the decreasing depth of winter convection
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  • 8
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    Precise single-grain 40Ar/39 Ar dating of a cold to warm climate transition in Central Europe (1989)
    Nature Publishing Group
    In:  Nature, 342 (6249). pp. 523-525.
    Details
    Publication Date: 2018-03-02
    Description: RECENT advances in 40Ar/39Ar dating1,2 have made it possible to date individual K-feldspar grains from Pleistocene tephra, a capability that greatly improves the reliability and temporal resolving power of the method. Here we apply these new techniques to the dating of a phonolite tephra from the East Eifel volcanic field in West Germany, which is sandwiched between loess and palaeosol (alfisol) deposits, and which was therefore erupted during the transition from a glacial to an interglacial period. Our age estimate for this transition is 215±4 kyr (1 σ), which has important implications for the marine δ18O timescale and for models of global climate change during the Pleistocene. The results show that single-grain dating can detect and compensate for the large quantities of xenocrystic contaminants which are found in many tephra deposits. This technique could be used to date the tephra layers found in marine sediment cores and the results could greatly enhance the reliability of the marine δ18O timescale for more rigorous Fourier analysis testing of the Milankovitch hypothesis.
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  • 9
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    Satellite measurements of sea surface cooling during hurricane Gloria (1987)
    Nature Publishing Group
    In:  Nature, 326 (6111). pp. 373-375.
    Details
    Publication Date: 2018-03-02
    Description: Hurricanes and other strong storms can cause important decreases in sea surface temperature by means of vertical mixing within the upper ocean, and by air–sea heat exchange. Here we use satellite-derived infrared images of the western North Atlantic to study sea surface cooling caused by hurricane Gloria (1985). Significant regional variations in sea surface cooling are well correlated with hydrographic conditions. The greatest cooling (up to 5°C) occurred in slope waters north of the Gulf Stream where the seasonal thermocline is shallowest and most compressed; moderate cooling (up to 3 °C) occurred in the open Sargasso Sea where the thermocline is deeper and more diffused; little or no cooling occurred in shallow coastal waters (bottom depth less than 20 m) which were isothermal before the passage of hurricane Gloria. There is a pronounced right-side asymmetry of sea surface cooling with stronger (by a factor of 4) and more extensive (by a factor of 3) cooling found on the right side of the hurricane track. These qualitative results are consistent with the notion that vertical mixing within the upper ocean is the dominant sea surface cooling mechanism of hurricanes.
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  • 10
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    Fractionation processes in Deccan Traps magmas: Comments on the paper by G. Sen - Mineralogy and petrogenesis of the Deccan Trap lava flows around Mahabaleshwar, India (1987)
    Oxford Univ. Press
    In:  Journal of Petrology, 28 (1). pp. 235-238.
    Details
    Publication Date: 2017-10-10
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