Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography
Carbon fixation by phytoplankton plays a key role in the uptake of atmospheric CO2 in the Southern Ocean. Yet, it still remains unclear how efficiently the particulate organic carbon (POC) is exported and transferred from ocean surface waters to depth during phytoplankton blooms. In addition, little...
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Online Access: | https://dx.doi.org/10.1594/pangaea.848823 https://doi.pangaea.de/10.1594/PANGAEA.848823 |
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ftdatacite:10.1594/pangaea.848823 2023-05-15T18:24:59+02:00 Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Hvitfeldt Rutgers van der Loeff, Michiel M Klaas, Christine Cheah, Wee Bracher, Astrid Masqué, Pere 2015 application/zip https://dx.doi.org/10.1594/pangaea.848823 https://doi.pangaea.de/10.1594/PANGAEA.848823 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.dsr2.2015.12.007 https://dx.doi.org/10.1016/j.dsr2.2016.05.016 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY article Supplementary Collection of Datasets Collection 2015 ftdatacite https://doi.org/10.1594/pangaea.848823 https://doi.org/10.1016/j.dsr2.2015.12.007 https://doi.org/10.1016/j.dsr2.2016.05.016 2022-02-09T13:30:04Z Carbon fixation by phytoplankton plays a key role in the uptake of atmospheric CO2 in the Southern Ocean. Yet, it still remains unclear how efficiently the particulate organic carbon (POC) is exported and transferred from ocean surface waters to depth during phytoplankton blooms. In addition, little is known about the processes that control the flux attenuation within the upper twilight zone. Here, we present results of downward POC and particulate organic nitrogen fluxes during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean in summer 2012. We used thorium-234 (234Th) as a particle tracer in combination with drifting sediment traps (ST). Their simultaneous use evidenced a sustained high export rate of 234Th at 100 m depth in the weeks prior to and during the sampling period. The entire study area, of approximately 8000 km**2, showed similar vertical export fluxes in spite of the heterogeneity in phytoplankton standing stocks and productivity, indicating a decoupling between production and export. The POC fluxes at 100 m were high, averaging 26 ± 15 mmol C/m**2/d, although the strength of the biological pump was generally low. Only <20% of the daily primary production reached 100 m, presumably due to an active recycling of carbon and nutrients. Pigment analyses indicated that direct sinking of diatoms likely caused the high POC transfer efficiencies (~60%) observed between 100 and 300 m, although faecal pellets and transport of POC linked to zooplankton vertical migration might have also contributed to downward fluxes. Article in Journal/Newspaper Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Roca ENVELOPE(-44.817,-44.817,-60.733,-60.733) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
Carbon fixation by phytoplankton plays a key role in the uptake of atmospheric CO2 in the Southern Ocean. Yet, it still remains unclear how efficiently the particulate organic carbon (POC) is exported and transferred from ocean surface waters to depth during phytoplankton blooms. In addition, little is known about the processes that control the flux attenuation within the upper twilight zone. Here, we present results of downward POC and particulate organic nitrogen fluxes during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean in summer 2012. We used thorium-234 (234Th) as a particle tracer in combination with drifting sediment traps (ST). Their simultaneous use evidenced a sustained high export rate of 234Th at 100 m depth in the weeks prior to and during the sampling period. The entire study area, of approximately 8000 km**2, showed similar vertical export fluxes in spite of the heterogeneity in phytoplankton standing stocks and productivity, indicating a decoupling between production and export. The POC fluxes at 100 m were high, averaging 26 ± 15 mmol C/m**2/d, although the strength of the biological pump was generally low. Only <20% of the daily primary production reached 100 m, presumably due to an active recycling of carbon and nutrients. Pigment analyses indicated that direct sinking of diatoms likely caused the high POC transfer efficiencies (~60%) observed between 100 and 300 m, although faecal pellets and transport of POC linked to zooplankton vertical migration might have also contributed to downward fluxes. |
format |
Article in Journal/Newspaper |
author |
Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Hvitfeldt Rutgers van der Loeff, Michiel M Klaas, Christine Cheah, Wee Bracher, Astrid Masqué, Pere |
spellingShingle |
Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Hvitfeldt Rutgers van der Loeff, Michiel M Klaas, Christine Cheah, Wee Bracher, Astrid Masqué, Pere Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
author_facet |
Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Hvitfeldt Rutgers van der Loeff, Michiel M Klaas, Christine Cheah, Wee Bracher, Astrid Masqué, Pere |
author_sort |
Roca-Martí, Montserrat |
title |
Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
title_short |
Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
title_full |
Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
title_fullStr |
Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
title_full_unstemmed |
Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012, supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography |
title_sort |
thorium-234, poc and pon fluxes during polarstern cruise ant-xxviii/3, january-march 2012, supplement to: roca-martí, montserrat; puigcorbé, viena; iversen, morten hvitfeldt; rutgers van der loeff, michiel m; klaas, christine; cheah, wee; bracher, astrid; masqué, pere (2015): high particulate organic carbon export during the decline of a vast diatom bloom in the atlantic sector of the southern ocean. deep sea research part ii: topical studies in oceanography |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2015 |
url |
https://dx.doi.org/10.1594/pangaea.848823 https://doi.pangaea.de/10.1594/PANGAEA.848823 |
long_lat |
ENVELOPE(-44.817,-44.817,-60.733,-60.733) |
geographic |
Roca Southern Ocean |
geographic_facet |
Roca Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1016/j.dsr2.2015.12.007 https://dx.doi.org/10.1016/j.dsr2.2016.05.016 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.848823 https://doi.org/10.1016/j.dsr2.2015.12.007 https://doi.org/10.1016/j.dsr2.2016.05.016 |
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1766206061781450752 |