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  • 2000-2004  (12)
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  • 1
    Series available for loan
    Series available for loan
    Actinium-227 als Tracer für Advektion und Mischung in der Tiefsee (2001)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Details Availability
    Call number: ZSP-168-385
    In: Berichte zur Polar- und Meeresforschung
    Type of Medium: Series available for loan
    Pages: VII, 112 S.
    Series Statement: Berichte zur Polar- und Meeresforschung 385
    URL: http://hdl.handle.net/10013/epic.10389
    Language: German
    Location: AWI Reading room
    Branch Library: AWI Library
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    BOOK
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  • 2
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    Adsorption of thorium and protactinium onto different particle types: experimental findings 1 1Associate editor: S. Krishnaswami (2004)
    Elsevier
    Details
    Publication Date: 2004-04-01
    Print ISSN: 0016-7037
    Electronic ISSN: 1872-9533
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Actinium-227 als Tracer für Advektion und Mischung in der Tiefsee = Actinium-227 as a tracer for advection and mixing in the deep-sea (2000)
    In:  (PhD/ Doctoral thesis), Universität Bremen, Bremen, Germany, 112 pp . Berichte zur Polar- und Meeresforschung, 385 .
    Details
    Publication Date: 2015-06-11
    Type: Thesis , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Radionuclides in the water column at station PS2337-2 (2002)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Actinium-227, dissolved; Actinium-227, dissolved, standard deviation; Actinium-227 excess; Actinium-227 excess, standard deviation; Alpha spectrometry; ANT-X/5; AWI_MarGeoChem; AWI_Paleo; Comment; DEPTH, water; Error, relative; In situ pump; ISP; JGOFS; Joint Global Ocean Flux Study; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; PS22/836; PS22 06AQANTX_5; PS2337-2; Sample volume; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 5
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    Radionuclides measured on water bottle profiles during POLARSTERN cruise ANT-XVI/3 (2002)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Actinium-227, dissolved; Actinium-227, dissolved, standard deviation; Actinium-227 excess; Actinium-227 excess, standard deviation; Alpha spectrometry; ANT-XVI/3; AWI_MarGeoChem; AWI_Paleo; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Error, relative; Event label; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; PS53; PS53/190-1; PS53/197-1; PS53/206-1; PS53/207-5; Sample volume
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
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    DATA PANGAEA
  • 6
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    Radionuclides measured on water bottle samples (2002)
    PANGAEA
    In:  Supplement to: Geibert, Walter; Rutgers van der Loeff, Michiel M; Hanfland, Claudia; Dauelsberg, Hans-Jürgen (2002): Actinium-227 as a Deep-Sea Tracer: Sources, Distribution and Applications. Earth and Planetary Science Letters, 198(1-2), 147-165, https://doi.org/10.1016/S0012-821X(02)00512-5
    Details
    Publication Date: 2024-02-19
    Description: Actinium is one of the rarest naturally occurring elements on earth. We measured its longest-lived isotope 227Ac (half-life 21.77 yr) for the first time in the water column of the Southeast Pacific, the Central Arctic, the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG). Besides the profile in the Southeast Pacific, which confirms earlier findings about the role of diapycnal mixing for 227Ac distribution, we found three other different types of vertical profiles. These profiles point to a prominent role of advection for 227Ac distribution, especially in the Southern Ocean. Depending on the type of profile found, 227Ac is proposed as a tracer for different oceanographic questions. In the Southern Ocean, up to 4.93±0.32 dpm/m**3 227Ac is found close to the sea floor, which is the highest concentration ever observed in the ocean. Close to the sea surface in the WG, 0.46±0.05 dpm/m**3 227Acex (227Ac in excess of its progenitor 231Pa) is detected. We use 227Acex there to determine the upwelling velocity in the Eastern WG to be about 55 m/yr. In the ACC, Upper and Lower Circumpolar Deep Water (UCDW and LCDW) are found to differ clearly in their 227Acex activity. High 227Acex activities are therefore a promising tracer for recent inputs of LCDW to the sea surface, which may help to understand the role of deep upwelling for iron inputs into Antarctic surface waters. The expected release of 227Ac is compared with 228Ra to make sure that the large near-surface excess in the water column of the Southern Ocean is not due to lateral inputs by isopycnal mixing. Data from the Central Arctic and from a transect across the ACC confirm that 228Ra and 227Acex differ strongly in their sources. The first measurements of 227Ac on suspended matter (less than 1.7% of total 227Ac close to the sea floor) indicate that the particle reactivity of 227Ac is negligible in the open ocean, in agreement with earlier findings [Y. Nozaki, Nature 310 (1984) 486-488]. Despite the extremely low concentrations of 227Ac, new measurement techniques [W.S. Moore, R. Arnold, J. Geophys. Res. 101 (1996) 1321-1329] point to a comfortable and comparably simple determination of 227Ac in the future. Finally, 227Acex may become a widely used deep-sea specific tracer.
    Keywords: Amundsen Basin; ANT-X/5; ANT-XI/4; ANT-XII/4; ANT-XVI/3; ARK-VIII/3; AWI_MarGeoChem; AWI_Paleo; Cosmonauts Sea; CTD/Rosette; CTD-RO; In situ pump; ISP; JGOFS; Joint Global Ocean Flux Study; Marine Geochemistry @ AWI; MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS19/173; PS19 ARCTIC91; PS2176-2; PS22/836; PS22 06AQANTX_5; PS2337-2; PS2579-2; PS2600-4; PS2660-7; PS30; PS30/115; PS30/137; PS35/014; PS35 06AQANTXII_4; PS53; PS53/190-1; PS53/197-1; PS53/206-1; PS53/207-5; South Atlantic Ocean; Southeast Pacific; Weddell Sea
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
  • 7
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    Radionuclides in the water column at station PS2600-4 (2002)
    PANGAEA
    Details
    Publication Date: 2024-02-19
    Keywords: Actinium-227, dissolved; Actinium-227, dissolved, standard deviation; Actinium-227, particulate; Actinium-227, particulate, standard deviation; Actinium-227 excess; Actinium-227 excess, standard deviation; Alpha spectrometry; ANT-XI/4; AWI_MarGeoChem; AWI_Paleo; Comment; Cosmonauts Sea; DEPTH, water; Error, relative; In situ pump; ISP; JGOFS; Joint Global Ocean Flux Study; Marine Geochemistry @ AWI; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; Protactinium-231, particulate; Protactinium-231, particulate standard deviation; PS2600-4; PS30; PS30/137; Sample volume
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
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    DATA PANGAEA
  • 8
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    Particle flux, sedimentation rates and authigenic MnO2 concentration of surface sediments (2003)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: ANT-X/5; ANT-XVII/4; Argentine Basin; AWI_MarGeoChem; AWI_Paleo; Brazil Basin; Calculated; CTD, memory; CTD-M; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GeoB2107-5; GeoB2108-1; GeoB2109-3; GeoB2110-1; GeoB2112-1; GeoB2113-1; GeoB2703-6; GeoB2704-1; GeoB2705-7; GeoB2706-6; GeoB2707-4; GeoB2708-5; GeoB2709-6; GeoB2712-2; GeoB2714-5; GeoB2715-1; GeoB2717-8; GeoB2718-1; GeoB2719-2; GeoB2722-2; GeoB2723-2; GeoB2724-7; GeoB2726-3; GeoB2727-1; GeoB2729-1; GeoB2730-1; GeoB2731-1; GeoB2801-1; GeoB2802-2; GeoB2803-1; GeoB2804-2; GeoB2805-1; GeoB2806-6; GeoB2807-1; GeoB2808-3; GeoB2809-2; GeoB2810-2; GeoB2811-1; GeoB2812-3; GeoB2813-1; GeoB2814-3; GeoB2817-3; GeoB2818-1; GeoB2820-1; GeoB2824-1; GeoB2825-3; GeoB2826-1; GeoB2828-1; GeoB2829-3; GeoB3822-1; GeoB6202-3; GeoB6206-1; GeoB6208-2; GeoB6214-5; GeoB6217-2; GeoB6219-7; GeoB6223-2; GeoB6226-7; GeoB6301-1; Giant box corer; GKG; Latitude of event; Longitude of event; M23/2; M29/1; M29/2; M34/3; M46/2; M46/3; Manganese dioxide, authigenic; Marine Geochemistry @ AWI; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Particle, flux; Polarstern; PS22/690; PS22/712; PS22/721; PS22 06AQANTX_5; PS2254-1; PS2256-4; PS2257-1; PS2262-7; PS56; PS56/203-1a; Rio Grande Rise; Santos Plateau; Sedimentation rate; Slope off Argentina; South Atlantic; South Atlantic Ocean; Uruguay continental margin; Vema Channel
    Type: Dataset
    Format: text/tab-separated-values, 236 data points
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    DATA PANGAEA
  • 9
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    Uranium, protactinium and thorium radionuclide activities in surface sediments of the continental slope of the Argentine basin (2003)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: This is a set of bulk sediment analyses of 230Th, 232Th, 231Pa as well as uranium isotopes in surface sediments from the continental slope of the Argentine basin. Samples were subject to full digestion, and radioisotope data were determined using isotope dilution after ion chromatographic separation, electroplating and counting via alphaspectrometry (233Pa yield tracer: beta-counting) by Steffen Niemann as part of his diploma thesis in 2003 (supervision FU Berlin- Prof. Heubeck/ AWI Bremerhaven-Dr. Walter Geibert and Prof. Michael Schlüter).
    Keywords: Alpha spectrometry; ANT-XVII/4; Argentine Basin; AWI_MarGeoChem; AWI_Paleo; Calculated; CTD, memory; CTD-M; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GeoB2706-6; GeoB2707-4; GeoB2708-5; GeoB2709-6; GeoB2712-2; GeoB2714-5; GeoB2715-1; GeoB2717-8; GeoB2718-1; GeoB2719-2; GeoB2722-2; GeoB2723-2; GeoB2724-7; GeoB2726-3; GeoB2727-1; GeoB2729-1; GeoB2730-1; GeoB2801-1; GeoB2802-2; GeoB2804-2; GeoB2805-1; GeoB2806-6; GeoB2807-1; GeoB2813-1; GeoB2814-3; GeoB2824-1; GeoB6202-3; GeoB6206-1; GeoB6208-2; GeoB6214-5; GeoB6217-2; GeoB6219-7; GeoB6223-2; GeoB6226-7; GeoB6301-1; Latitude of event; Longitude of event; M29/1; M29/2; M46/2; M46/3; Marine Geochemistry @ AWI; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231; Protactinium-231, standard deviation; Protactinium-231/Thorium-230 excess; Protactinium-231/Thorium-230 excess, standard deviation; Protactinium-231 excess; Protactinium-231 excess, standard deviation; PS56; PS56/203-1a; Santos Plateau; Slope off Argentina; South Atlantic; Thorium-228; Thorium-228, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Thorium-232 activity ratio; Uranium-234/Thorium-232 activity ratio, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, authigenic; Uranium-238, authigenic, standard deviation; Uranium-238, standard deviation; Uruguay continental margin
    Type: Dataset
    Format: text/tab-separated-values, 930 data points
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    DATA PANGAEA
  • 10
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    Radionuclides in the water column at station PS2176-2 (2002)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Actinium-227, dissolved; Actinium-227, dissolved, standard deviation; Actinium-227 excess; Actinium-227 excess, standard deviation; Alpha spectrometry; Amundsen Basin; ARK-VIII/3; AWI_MarGeoChem; AWI_Paleo; DEPTH, water; Error, relative; JGOFS; Joint Global Ocean Flux Study; Marine Geochemistry @ AWI; MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Protactinium-231, dissolved; Protactinium-231, dissolved, standard deviation; PS19/173; PS19 ARCTIC91; PS2176-2; Sample volume
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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