210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic
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. Unsupport...
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1977
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.604014 2023-05-15T17:29:42+02:00 210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic Bacon, Michael P 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 1977-03-12 application/zip, 10 datasets https://doi.pangaea.de/10.1594/PANGAEA.604014 https://doi.org/10.1594/PANGAEA.604014 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.604014 https://doi.org/10.1594/PANGAEA.604014 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bacon, Michael P (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 Bottle Niskin 30-L GEOSECS M32 M32_008 M32_012 M32_015 M32_018 M32_021 M32_022 M32_023 M32_027 M32_032 M32_034 Meteor (1964) NIS_30L North Atlantic Dataset 1977 ftpangaea https://doi.org/10.1594/PANGAEA.604014 2023-01-20T07:31:03Z 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. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-66.500000,-11.500000,38.500000,14.500000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Bottle Niskin 30-L GEOSECS M32 M32_008 M32_012 M32_015 M32_018 M32_021 M32_022 M32_023 M32_027 M32_032 M32_034 Meteor (1964) NIS_30L North Atlantic |
spellingShingle |
Bottle Niskin 30-L GEOSECS M32 M32_008 M32_012 M32_015 M32_018 M32_021 M32_022 M32_023 M32_027 M32_032 M32_034 Meteor (1964) NIS_30L North Atlantic Bacon, Michael P 210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
topic_facet |
Bottle Niskin 30-L GEOSECS M32 M32_008 M32_012 M32_015 M32_018 M32_021 M32_022 M32_023 M32_027 M32_032 M32_034 Meteor (1964) NIS_30L North Atlantic |
description |
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. |
format |
Dataset |
author |
Bacon, Michael P |
author_facet |
Bacon, Michael P |
author_sort |
Bacon, Michael P |
title |
210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
title_short |
210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
title_full |
210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
title_fullStr |
210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
title_full_unstemmed |
210Pb and 210Po results from F.S. "Meteor" cruise 32 in the North Atlantic |
title_sort |
210pb and 210po results from f.s. "meteor" cruise 32 in the north atlantic |
publisher |
PANGAEA |
publishDate |
1977 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.604014 https://doi.org/10.1594/PANGAEA.604014 |
op_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 |
long_lat |
ENVELOPE(-66.500000,-11.500000,38.500000,14.500000) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Bacon, Michael P (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 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.604014 https://doi.org/10.1594/PANGAEA.604014 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.604014 |
_version_ |
1766124489279537152 |