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  • 1
    Book
    Book
    Shipboard ADCP observations during RRS Charles Darwin cruise 51 (1992)
    Wormley, Godalming, Surrey : Inst. of Oceanographic Sciences, Deacon Lab.
    Details Availability
    Type of Medium: Book
    Pages: 97 S
    Series Statement: Institute of Oceanographic Sciences Deacon Laboratory report 293
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of fission-products and actinides in the Black Sea following the Cherynobyl accident (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 33-47 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Radiochemical procedures are discussed for the isolation and determination of a suite of radionuclides in samples from the Black Sea following their input from the Chernobyl reactor accident. The samples analyzed include discrete water samples and both suspended and dissolved phases collected by in-situ chemisorption techniques. The radiochemical scheme permits the separation and analysis of134Cs,137Cs,90Sr,144Ce,147Pm,106Ru,239Pu,240Pu, and in some instances242Cm,238Pu, and241Am. The detection techniques employed include various instrumental gamma spectrometric methods, low-level beta counting, alpha spectrometry, and mass spectrometry. The method's developments are described and data are presented on some representative samples from the Black Sea. The sensitivity of the analysis for the various nuclides and sample types is summarized and questions of radiochemical interferences are addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049345
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions (2001)
    In:  EPIC3Journal of Marine Systems, 30, 287-304, 30, pp. 287-304
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 4
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    Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater (2006)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-26
    Description: Two polypropylene cartridge types (Beta Pure and Hytrex II) were tested in the laboratory as adsorbers for in-situ collection of dissolved Thorium-234 (234TH) in seawater. Using a uranyl nitrate tracer, we determined that a Mn02 impregnated 3.25-inch Hytrex II cartridge with a flow rate of 8 liters/minute would collect 234TH with a greater than 60% effciency. The smaller size and composition of the 3.25 inch Hytrex II cartridge enabled it to be pressed into a permanent 1-inch "puck" for direct gamma counting. This protocol significantly reduced the handling between collection and counting. When field tested in the Gulf of Maine as a large volume (〉500 liters) collector, the new adsorbers produced a greater than 80% collection effciency and a dissolved 234TH concentration which was consistent with independent samples collected at the same station and depth. These adsorbers were used successfully for the in-situ collection of 234TH in large volumes of seawater during the 1992 NOAA and NSF sponsored JGOFS EqPac program, with a mean collection efficiency of 0.79 +/- 9% (n=104 cartridge pairs).
    Description: Funding was provided by the National Oceanic and Atmospheric Administration Offce of Global Programs under Contract OCE-920395200.
    Keywords: Thorium-234 ; Mn02 adsorber ; seawater ; Cape Hatteras (Ship) Cruise ; Malcolm Baldridge (Ship) Cruise ; Discoverer (Ship) Cruise
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 897958 bytes
    Format: application/pdf
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    PAPER (OA)
  • 5
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    Predominance of heavily calcified coccolithophores at low CaCO3 saturation during winter in the Bay of Biscay (2012)
    National Academy of Sciences
    In:  PNAS Proceedings of the National Academy of Sciences of the United States of America, 109 (23). pp. 8845-8849.
    Details
    Publication Date: 2014-01-27
    Description: Coccolithophores are an important component of the Earth system, and, as calcifiers, their possible susceptibility to ocean acidification is of major concern. Laboratory studies at enhanced pCO2 levels have produced divergent results without overall consensus. However, it has been predicted from these studies that, although calcification may not be depressed in all species, acidification will produce "a transition in dominance from more to less heavily calcified coccolithophores"Ridgwell A, et al., (2009) Biogeosciences 6:2611-2623. A recent observational study Beaufort L, et al., (2011) Nature 476:80-83 also suggested that coccolithophores are less calcified in more acidic conditions.We present the results of a large observational study of coccolithophore morphology in the Bay of Biscay. Samples were collected once a month for over a year, along a 1,000-km-long transect. Our data clearly show that there is a pronounced seasonality in the morphotypes of Emiliania huxleyi, the most abundant coccolithophore species. Whereas pH and CaCO 3saturation are lowest in winter, the E. huxleyi population shifts from 〈10% (summer) to >90% (winter) of the heavily calcified form. However, it is unlikely that the shifts in carbonate chemistry alone caused the morphotype shift. Our finding that the most heavily calcified morphotype dominates when conditions are most acidic is contrary to the earlier predictions and raises further questions about the fate of coccolithophores in a high-CO2 world.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1073/pnas.1117508109
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Mesoscale subduction at the Almeria–Oran front - Part 2. Biophysical interactions (2001)
    Elsevier
    In:  Journal of Marine Systems, 30 (3-4). pp. 287-304.
    Details
    Publication Date: 2017-07-12
    Description: The Almeria–Oranfront forms where surface waters of Atlantic and Mediterranean origin meet at the eastern end of the Alboran Sea. A multidisciplinary field experiment on RRS Discovery in December 1996, in the second observational phase of the EU-funded Observations and Modelling of Eddy scale Geostrophic and Ageostrophic motions (OMEGA) project, observed the biological impact of mesoscale frontal instability of the Almeria–Oran frontal jet. It is concluded that periodic vertical velocities of ∼20 m/day, associated with the propagation of wave-like meanders along the front, have a significant effect on the vertical distribution of zooplankton across the front despite their ability to migrate at greater speeds. Observations of a layer of fluorescence coincident with subducted surface waters indicated that phytoplankton were drawn down and along isopycnals, by cross-front ageostrophic motion, to depths of 200 m. From the study of sound-scattering layers (SSL) identified in acoustic backscatter data, a layer of zooplankton was found coincident with the drawn-down phytoplankton. This layer persisted during and despite diel vertical migration. High-resolution optical plankton counter (OPC) data showed smaller zooplankton, which did not undertake diel vertical migration, remained concentrated near the surface in the fast-flowing frontal jet.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0924-7963(01)00063-X
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Overcalcified E. huxleyi in the Bay of Biscay [Environmental Sciences] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-06-06
    Description: Coccolithophores are an important component of the Earth system, and, as calcifiers, their possible susceptibility to ocean acidification is of major concern. Laboratory studies at enhanced pCO2 levels have produced divergent results without overall consensus. However, it has been predicted from these studies that, although calcification may not be depressed in all species, acidification will produce “a transition in dominance from more to less heavily calcified coccolithophores” [Ridgwell A, et al., (2009) Biogeosciences 6:2611–2623]. A recent observational study [Beaufort L, et al., (2011) Nature 476:80–83] also suggested that coccolithophores are less calcified in more acidic conditions. We present the results of a large observational study of coccolithophore morphology in the Bay of Biscay. Samples were collected once a month for over a year, along a 1,000-km-long transect. Our data clearly show that there is a pronounced seasonality in the morphotypes of Emiliania huxleyi, the most abundant coccolithophore species. Whereas pH and CaCO3 saturation are lowest in winter, the E. huxleyi population shifts from 90% (winter) of the heavily calcified form. However, it is unlikely that the shifts in carbonate chemistry alone caused the morphotype shift. Our finding that the most heavily calcified morphotype dominates when conditions are most acidic is contrary to the earlier predictions and raises further questions about the fate of coccolithophores in a high-CO2 world.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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