Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012)
The Arctic sea-ice extent reached a record minimum in September 2012. Sea-ice decline increases the absorption of solar energy in the Arctic Ocean, affecting primary production and the plankton community. How this will modulate the sinking of particulate organic carbon (POC) from the ocean surface r...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.858790 2023-05-15T14:27:16+02:00 Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) Roca-Martí, Montserrat Puigcorbé, Viena Stimac, Ingrid Rutgers van der Loeff, Michiel M Masqué, Pere MEDIAN LATITUDE: 84.474511 * MEDIAN LONGITUDE: 84.610033 * SOUTH-BOUND LATITUDE: 81.925000 * WEST-BOUND LONGITUDE: 17.597830 * NORTH-BOUND LATITUDE: 88.803000 * EAST-BOUND LONGITUDE: 131.105670 * DATE/TIME START: 2012-08-11T07:08:00 * DATE/TIME END: 2012-09-28T22:52:00 2016-03-14 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.858790 https://doi.org/10.1594/PANGAEA.858790 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.858790 https://doi.org/10.1594/PANGAEA.858790 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Rutgers van der Loeff, Michiel M; Katlein, Christian; Fernández-Méndez, Mar; Peeken, Ilka; Masqué, Pere (2016): Carbon export fluxes and export efficiency in the central Arctic during the record sea-ice minimum in 2012: A joint 234Th/238U and 210Po/210Pb study. Journal of Geophysical Research: Oceans, 121(7), 5030-5049, https://doi.org/10.1002/2016JC011816 Dataset 2016 ftpangaea https://doi.org/10.1594/PANGAEA.858790 https://doi.org/10.1002/2016JC011816 2023-01-20T07:33:41Z The Arctic sea-ice extent reached a record minimum in September 2012. Sea-ice decline increases the absorption of solar energy in the Arctic Ocean, affecting primary production and the plankton community. How this will modulate the sinking of particulate organic carbon (POC) from the ocean surface remains a key question. We use the 234Th/238U and 210Po/210Pb radionuclide pairs to estimate the magnitude of the POC export fluxes in the upper ocean of the central Arctic in summer 2012, covering time scales from weeks to months. The 234Th/238U proxy reveals that POC fluxes at the base of the euphotic zone were very low (2 ± 2 mmol C/m**2/d) in late summer. Relationships obtained between the 234Th export fluxes and the phytoplankton community suggest that prasinophytes contributed significantly to the downward fluxes, likely via incorporation into sea-ice algal aggregates and zooplankton-derived material. The magnitude of the depletion of 210Po in the upper water column over the entire study area indicates that particle export fluxes were higher before July/August than later in the season. 210Po fluxes and 210Po-derived POC fluxes correlated positively with sea-ice concentration, showing that particle sinking was greater under heavy sea-ice conditions than under partially ice-covered regions. Although the POC fluxes were low, a large fraction of primary production (>30%) was exported at the base of the euphotic zone in most of the study area during summer 2012, indicating a high export efficiency of the biological pump in the central Arctic. This article is protected by copyright. All rights reserved. Dataset Arctic Arctic Arctic Ocean Phytoplankton Sea ice Zooplankton PANGAEA - Data Publisher for Earth & Environmental Science Arctic Arctic Ocean The Ark ENVELOPE(-24.789,-24.789,-80.691,-80.691) ENVELOPE(17.597830,131.105670,88.803000,81.925000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The Arctic sea-ice extent reached a record minimum in September 2012. Sea-ice decline increases the absorption of solar energy in the Arctic Ocean, affecting primary production and the plankton community. How this will modulate the sinking of particulate organic carbon (POC) from the ocean surface remains a key question. We use the 234Th/238U and 210Po/210Pb radionuclide pairs to estimate the magnitude of the POC export fluxes in the upper ocean of the central Arctic in summer 2012, covering time scales from weeks to months. The 234Th/238U proxy reveals that POC fluxes at the base of the euphotic zone were very low (2 ± 2 mmol C/m**2/d) in late summer. Relationships obtained between the 234Th export fluxes and the phytoplankton community suggest that prasinophytes contributed significantly to the downward fluxes, likely via incorporation into sea-ice algal aggregates and zooplankton-derived material. The magnitude of the depletion of 210Po in the upper water column over the entire study area indicates that particle export fluxes were higher before July/August than later in the season. 210Po fluxes and 210Po-derived POC fluxes correlated positively with sea-ice concentration, showing that particle sinking was greater under heavy sea-ice conditions than under partially ice-covered regions. Although the POC fluxes were low, a large fraction of primary production (>30%) was exported at the base of the euphotic zone in most of the study area during summer 2012, indicating a high export efficiency of the biological pump in the central Arctic. This article is protected by copyright. All rights reserved. |
format |
Dataset |
author |
Roca-Martí, Montserrat Puigcorbé, Viena Stimac, Ingrid Rutgers van der Loeff, Michiel M Masqué, Pere |
spellingShingle |
Roca-Martí, Montserrat Puigcorbé, Viena Stimac, Ingrid Rutgers van der Loeff, Michiel M Masqué, Pere Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
author_facet |
Roca-Martí, Montserrat Puigcorbé, Viena Stimac, Ingrid Rutgers van der Loeff, Michiel M Masqué, Pere |
author_sort |
Roca-Martí, Montserrat |
title |
Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
title_short |
Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
title_full |
Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
title_fullStr |
Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
title_full_unstemmed |
Th-234 and Po-210 as POC flux proxies during the ARK-XXVII/3 expedition (August-October 2012) |
title_sort |
th-234 and po-210 as poc flux proxies during the ark-xxvii/3 expedition (august-october 2012) |
publisher |
PANGAEA |
publishDate |
2016 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.858790 https://doi.org/10.1594/PANGAEA.858790 |
op_coverage |
MEDIAN LATITUDE: 84.474511 * MEDIAN LONGITUDE: 84.610033 * SOUTH-BOUND LATITUDE: 81.925000 * WEST-BOUND LONGITUDE: 17.597830 * NORTH-BOUND LATITUDE: 88.803000 * EAST-BOUND LONGITUDE: 131.105670 * DATE/TIME START: 2012-08-11T07:08:00 * DATE/TIME END: 2012-09-28T22:52:00 |
long_lat |
ENVELOPE(-24.789,-24.789,-80.691,-80.691) ENVELOPE(17.597830,131.105670,88.803000,81.925000) |
geographic |
Arctic Arctic Ocean The Ark |
geographic_facet |
Arctic Arctic Ocean The Ark |
genre |
Arctic Arctic Arctic Ocean Phytoplankton Sea ice Zooplankton |
genre_facet |
Arctic Arctic Arctic Ocean Phytoplankton Sea ice Zooplankton |
op_source |
Supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Rutgers van der Loeff, Michiel M; Katlein, Christian; Fernández-Méndez, Mar; Peeken, Ilka; Masqué, Pere (2016): Carbon export fluxes and export efficiency in the central Arctic during the record sea-ice minimum in 2012: A joint 234Th/238U and 210Po/210Pb study. Journal of Geophysical Research: Oceans, 121(7), 5030-5049, https://doi.org/10.1002/2016JC011816 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.858790 https://doi.org/10.1594/PANGAEA.858790 |
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.858790 https://doi.org/10.1002/2016JC011816 |
_version_ |
1766300912282763264 |