High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean
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...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://epic.awi.de/id/eprint/39346/ https://epic.awi.de/id/eprint/39346/1/Roca-Marti_etal_2017.pdf https://doi.org/10.1016/j.dsr2.2015.12.007 https://hdl.handle.net/10013/epic.48590 https://hdl.handle.net/10013/epic.48590.d001 |
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ftawi:oai:epic.awi.de:39346 2024-09-15T18:37:02+00:00 High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Rutgers v. d. Loeff, Michiel Klaas, Christine Cheah, Wee Bracher, Astrid Masque, Pere 2017-04 application/pdf https://epic.awi.de/id/eprint/39346/ https://epic.awi.de/id/eprint/39346/1/Roca-Marti_etal_2017.pdf https://doi.org/10.1016/j.dsr2.2015.12.007 https://hdl.handle.net/10013/epic.48590 https://hdl.handle.net/10013/epic.48590.d001 unknown PERGAMON-ELSEVIER SCIENCE LTD https://epic.awi.de/id/eprint/39346/1/Roca-Marti_etal_2017.pdf https://hdl.handle.net/10013/epic.48590.d001 Roca-Martí, M. , Puigcorbé, V. , Iversen, M. orcid:0000-0002-5287-1110 , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Klaas, C. orcid:0000-0002-6679-8970 , Cheah, W. , Bracher, A. orcid:0000-0003-3025-5517 and Masque, P. (2017) 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, 138 , pp. 102-115 . doi:10.1016/j.dsr2.2015.12.007 <https://doi.org/10.1016/j.dsr2.2015.12.007> , hdl:10013/epic.48590 EPIC3Deep-Sea Research Part II-Topical Studies in Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 138, pp. 102-115, ISSN: 0967-0645 Article isiRev 2017 ftawi https://doi.org/10.1016/j.dsr2.2015.12.007 2024-06-24T04:13:16Z 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 km2, 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−1, 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Deep Sea Research Part II: Topical Studies in Oceanography 138 102 115 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 km2, 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−1, 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 Rutgers v. d. Loeff, Michiel Klaas, Christine Cheah, Wee Bracher, Astrid Masque, Pere |
spellingShingle |
Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Rutgers v. d. Loeff, Michiel Klaas, Christine Cheah, Wee Bracher, Astrid Masque, Pere High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
author_facet |
Roca-Martí, Montserrat Puigcorbé, Viena Iversen, Morten Rutgers v. d. Loeff, Michiel Klaas, Christine Cheah, Wee Bracher, Astrid Masque, Pere |
author_sort |
Roca-Martí, Montserrat |
title |
High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
title_short |
High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
title_full |
High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
title_fullStr |
High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean |
title_sort |
high particulate organic carbon export during the decline of a vast diatom bloom in the atlantic sector of the southern ocean |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/39346/ https://epic.awi.de/id/eprint/39346/1/Roca-Marti_etal_2017.pdf https://doi.org/10.1016/j.dsr2.2015.12.007 https://hdl.handle.net/10013/epic.48590 https://hdl.handle.net/10013/epic.48590.d001 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Deep-Sea Research Part II-Topical Studies in Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 138, pp. 102-115, ISSN: 0967-0645 |
op_relation |
https://epic.awi.de/id/eprint/39346/1/Roca-Marti_etal_2017.pdf https://hdl.handle.net/10013/epic.48590.d001 Roca-Martí, M. , Puigcorbé, V. , Iversen, M. orcid:0000-0002-5287-1110 , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Klaas, C. orcid:0000-0002-6679-8970 , Cheah, W. , Bracher, A. orcid:0000-0003-3025-5517 and Masque, P. (2017) 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, 138 , pp. 102-115 . doi:10.1016/j.dsr2.2015.12.007 <https://doi.org/10.1016/j.dsr2.2015.12.007> , hdl:10013/epic.48590 |
op_doi |
https://doi.org/10.1016/j.dsr2.2015.12.007 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
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138 |
container_start_page |
102 |
op_container_end_page |
115 |
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1810481260023250944 |