Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins
210Pb and 210Po are naturally occurring radionuclides that are commonly used as a proxy for particle and carbon export. In this study, the distribution of the 210Po/210Pb pair was investigated in the water column of the Barents, Kara and Laptev Seas and the Nansen, Amundsen and Makarov Basins in ord...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Edith Cowan University, Research Online, Perth, Western Australia
2018
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ftedithcowan:oai:ro.ecu.edu.au:ecuworkspost2013-6496 2023-05-15T14:46:06+02:00 Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins Roca-Marti, Montserrat Puigcorbé, Viena Friedrich, Jana Rutgers van der Loeff, Michiel Rabe, Benjamin Korhonen, Meri Garcia-Orellana, Jordi Masqué, Pere 2018-01-01T08:00:00Z https://ro.ecu.edu.au/ecuworkspost2013/5489 https://doi.org/10.1016/j.dsr.2018.09.011 unknown Edith Cowan University, Research Online, Perth, Western Australia https://ro.ecu.edu.au/ecuworkspost2013/5489 https://doi.org/10.1016/j.dsr.2018.09.011 subscription content Research outputs 2014 to 2021 Particle export Annual new primary production Scavenging 210Po/210Pb Arctic Ocean 2007 sea-ice minimum Oceanography text 2018 ftedithcowan https://doi.org/10.1016/j.dsr.2018.09.011 2022-03-19T23:48:44Z 210Pb and 210Po are naturally occurring radionuclides that are commonly used as a proxy for particle and carbon export. In this study, the distribution of the 210Po/210Pb pair was investigated in the water column of the Barents, Kara and Laptev Seas and the Nansen, Amundsen and Makarov Basins in order to understand the particle dynamics in the Arctic Ocean during the 2007 sea-ice minimum (August–September). Minimum activities of total 210Pb and 210Po were found in the upper and lower haloclines (approx. 60–130 m), which are partly attributed to particle scavenging over the shelves, boundary current transport and subsequent advection of the water with low 210Pb and 210Po activities into the central Arctic. Widespread and substantial (> 50%) deficits of 210Po with respect to 210Pb were detected from surface waters to 200 m on the shelves, but also in the basins. This was particularly important in the Makarov Basin where, despite very low chlorophyll-a levels, estimates of annual new primary production were three times higher than in the Eurasian Basin. In the Nansen, Amundsen and Makarov Basins, estimates of annual new primary production correlated with the deficits of 210Po in the upper 200 m of the water column, suggesting that in situ production and subsequent export of biogenic material were the mechanisms that controlled the removal of 210Po in the central Arctic. Unlike 210Po, 234Th deficits measured during the same expedition were found to be very small and not significant below 25 m in the basins (Cai et al., 2010), which indicates, given the shorter half-life of 234Th, that particle export fluxes in the central Arctic would have been higher before July–August in 2007 than later in the season. Text Arctic Arctic Ocean laptev makarov basin Nansen Sea ice Edith Cowan University (ECU, Australia): Research Online Arctic Arctic Ocean Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Deep Sea Research Part I: Oceanographic Research Papers 142 94 106 |
institution |
Open Polar |
collection |
Edith Cowan University (ECU, Australia): Research Online |
op_collection_id |
ftedithcowan |
language |
unknown |
topic |
Particle export Annual new primary production Scavenging 210Po/210Pb Arctic Ocean 2007 sea-ice minimum Oceanography |
spellingShingle |
Particle export Annual new primary production Scavenging 210Po/210Pb Arctic Ocean 2007 sea-ice minimum Oceanography Roca-Marti, Montserrat Puigcorbé, Viena Friedrich, Jana Rutgers van der Loeff, Michiel Rabe, Benjamin Korhonen, Meri Garcia-Orellana, Jordi Masqué, Pere Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
topic_facet |
Particle export Annual new primary production Scavenging 210Po/210Pb Arctic Ocean 2007 sea-ice minimum Oceanography |
description |
210Pb and 210Po are naturally occurring radionuclides that are commonly used as a proxy for particle and carbon export. In this study, the distribution of the 210Po/210Pb pair was investigated in the water column of the Barents, Kara and Laptev Seas and the Nansen, Amundsen and Makarov Basins in order to understand the particle dynamics in the Arctic Ocean during the 2007 sea-ice minimum (August–September). Minimum activities of total 210Pb and 210Po were found in the upper and lower haloclines (approx. 60–130 m), which are partly attributed to particle scavenging over the shelves, boundary current transport and subsequent advection of the water with low 210Pb and 210Po activities into the central Arctic. Widespread and substantial (> 50%) deficits of 210Po with respect to 210Pb were detected from surface waters to 200 m on the shelves, but also in the basins. This was particularly important in the Makarov Basin where, despite very low chlorophyll-a levels, estimates of annual new primary production were three times higher than in the Eurasian Basin. In the Nansen, Amundsen and Makarov Basins, estimates of annual new primary production correlated with the deficits of 210Po in the upper 200 m of the water column, suggesting that in situ production and subsequent export of biogenic material were the mechanisms that controlled the removal of 210Po in the central Arctic. Unlike 210Po, 234Th deficits measured during the same expedition were found to be very small and not significant below 25 m in the basins (Cai et al., 2010), which indicates, given the shorter half-life of 234Th, that particle export fluxes in the central Arctic would have been higher before July–August in 2007 than later in the season. |
format |
Text |
author |
Roca-Marti, Montserrat Puigcorbé, Viena Friedrich, Jana Rutgers van der Loeff, Michiel Rabe, Benjamin Korhonen, Meri Garcia-Orellana, Jordi Masqué, Pere |
author_facet |
Roca-Marti, Montserrat Puigcorbé, Viena Friedrich, Jana Rutgers van der Loeff, Michiel Rabe, Benjamin Korhonen, Meri Garcia-Orellana, Jordi Masqué, Pere |
author_sort |
Roca-Marti, Montserrat |
title |
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
title_short |
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
title_full |
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
title_fullStr |
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
title_full_unstemmed |
Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins |
title_sort |
distribution of 210pb and 210po in the arctic water column during the 2007 sea-ice minimum: particle export in the ice-covered basins |
publisher |
Edith Cowan University, Research Online, Perth, Western Australia |
publishDate |
2018 |
url |
https://ro.ecu.edu.au/ecuworkspost2013/5489 https://doi.org/10.1016/j.dsr.2018.09.011 |
long_lat |
ENVELOPE(170.000,170.000,87.000,87.000) |
geographic |
Arctic Arctic Ocean Makarov Basin |
geographic_facet |
Arctic Arctic Ocean Makarov Basin |
genre |
Arctic Arctic Ocean laptev makarov basin Nansen Sea ice |
genre_facet |
Arctic Arctic Ocean laptev makarov basin Nansen Sea ice |
op_source |
Research outputs 2014 to 2021 |
op_relation |
https://ro.ecu.edu.au/ecuworkspost2013/5489 https://doi.org/10.1016/j.dsr.2018.09.011 |
op_rights |
subscription content |
op_doi |
https://doi.org/10.1016/j.dsr.2018.09.011 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
142 |
container_start_page |
94 |
op_container_end_page |
106 |
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1766317375085346816 |