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Bacon, Michael P (1977): 210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.604014, Supplement to: Bacon, MP (1977): 210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A19, 24-36

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Abstract:
The distribution of 210Pb and 210 Po on dissolved (< 0.4 micron) and particulate (> 0.4 micron) phases has been measured at ten stations occupied during cruise 32 of F.S. „Meteor“ in the tropical and eastern North Atlantic. Both radionuclides occur principally in the dissolved phase. Unsupported 210Pb activities, maintained by flux from the atmosphere, are present in the surface mixed layer and penetrate into the thermocline to depths of about 500 m. Dissolved 210Po is ordinarily present in the mixed layer at less than equilibrium concentrations, suggesting rapid biological removal of this nuclide. Particulate matter is enriched in 210Po, with 210Po/210Pb activity ratios greater than 1.0, similar to those reported for phytoplankton. At depths of 100-300 m, 210Po maxima occur, and unsupported 210Po is frequently present, an observation that suggests rapid re-cycling within the thermocline.
Comparison of the 210Pb distributions with those reported for 226Ra at nearby GEOSECS stations confirms the widespread existence of a 210Pb/226Ra disequilibrium in the deep sea. Close to the bottom, profiles of 210Pb and 226Ra usually diverge, and 210Pb concentrations frequently decrease with depth, suggesting a sink 210 Pb near the seafloor. Particulate 210Pb concentrations ordinarily show little systematic variation with depth. At depths greater than 1000 m, dissolved 210Po activities are, on the average, less than those of 210Pb by 12%. A corresponding 210 Po enrichment in the particulate phase is found.
Coverage:
Median Latitude: 20.970000 * Median Longitude: -39.740000 * South-bound Latitude: 14.500000 * West-bound Longitude: -66.500000 * North-bound Latitude: 38.500000 * East-bound Longitude: -11.500000
Date/Time Start: 1973-11-07T00:00:00 * Date/Time End: 1973-12-11T00:00:00
Event(s):
M32_008 * Latitude: 21.500000 * Longitude: -66.500000 * Date/Time Start: 1973-11-07T00:00:00 * Date/Time End: 1973-11-08T00:00:00 * Elevation: -5440.0 m * Location: North Atlantic * Campaign: M32 (GEOSECS) * Basis: Meteor (1964) * Method/Device: Bottle, Niskin 30-L (NIS_30L)
M32_012 * Latitude: 14.500000 * Longitude: -66.000000 * Date/Time Start: 1973-11-11T00:00:00 * Date/Time End: 1973-11-12T00:00:00 * Elevation: -4880.0 m * Location: North Atlantic * Campaign: M32 (GEOSECS) * Basis: Meteor (1964) * Method/Device: Bottle, Niskin 30-L (NIS_30L)
M32_015 * Latitude: 14.700000 * Longitude: -57.500000 * Date/Time Start: 1973-11-17T00:00:00 * Date/Time End: 1973-11-18T00:00:00 * Elevation: -5370.0 m * Location: North Atlantic * Campaign: M32 (GEOSECS) * Basis: Meteor (1964) * Method/Device: Bottle, Niskin 30-L (NIS_30L)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
10 datasets

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Datasets listed in this publication series

  1. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_008 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602181
  2. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_012 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602182
  3. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_015 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602183
  4. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_018 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602184
  5. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_021 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602185
  6. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_022 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602186
  7. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_023 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602187
  8. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_027 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602188
  9. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_032 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602189
  10. Bacon, MP (1977): Distribution of 210Pb and 210 Po in seawater at site M32_034 of the North Atlantic (Appendix). https://doi.org/10.1594/PANGAEA.602190