Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach
17 pages, 6 figures, 2 tables, 1 supplementary table Labile organic carbon (LOC) dynamics (i.e., of recently produced, planktonic material) and sediment dynamics were studied in the seabed using naturally occurring C and Pb measurements in the region where the Larsen Ice Shelves A and B were floatin...
Published in: | Geochimica et Cosmochimica Acta |
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Meteoritical Society
2018
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Online Access: | http://hdl.handle.net/10261/172926 https://doi.org/10.1016/j.gca.2018.08.011 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100000001 |
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ftcsic:oai:digital.csic.es:10261/172926 2024-02-11T09:56:31+01:00 Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach Isla, Enrique DeMaster, D.J. Ministerio de Economía y Competitividad (España) National Science Foundation (US) 2018-12 http://hdl.handle.net/10261/172926 https://doi.org/10.1016/j.gca.2018.08.011 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100000001 unknown Meteoritical Society https://doi.org/10.1016/j.gca.2018.08.011 Sí doi:10.1016/j.gca.2018.08.011 issn: 0016-7037 Geochimica et Cosmochimica Acta 242: 34-50 (2018) http://hdl.handle.net/10261/172926 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100000001 none Antarctica 14C Biogeochemistry 210Pb Labile organic carbon Larsen ice shelves Marine sediment Ice shelf collapse artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.1016/j.gca.2018.08.01110.13039/50110000332910.13039/100000001 2024-01-16T10:34:26Z 17 pages, 6 figures, 2 tables, 1 supplementary table Labile organic carbon (LOC) dynamics (i.e., of recently produced, planktonic material) and sediment dynamics were studied in the seabed using naturally occurring C and Pb measurements in the region where the Larsen Ice Shelves A and B were floating almost two decades ago. A non-steady-state diagenetic model was used to estimate sediment mixing coefficients as well as LOC fluxes to the seabed and LOC turnover times (i.e., mean residence times) in a suite of 14 sediment cores from the continental shelf, including a glacial trough. At four of the stations, cores were collected during 2007 and 2011 cruises, enabling a time-series approach for understanding the evolution of sedimentary processes and LOC dynamics in the deposits below a collapsed ice shelf. Sediment mixing coefficients, based on non-steady-state Pb profiles, varied between 0.01 cm y and 1.6 cm y in these post-ice shelf sediments. These values were similar to those found in polar deep-sea environments, where sedimentary conditions are less dynamic than in shallower provinces. LOC, whose abundance decreased uniformly with depth, was detected to depths ranging from 2 to 16 cm, with LOC seabed inventories varying from 1.5 to 22 mg LOC cm. Excess Pb and LOC fluxes were relatively uniform across the study area suggesting that similar particle fluxes have taken place within the Larsen system since the disintegration of the various ice shelves. The LOC mean residence time at the different stations varied from 3 y to >60 y. The C approach, calculating LOC content based on a two-end member model with planktonic C as the labile carbon end member, most closely correlated with the lipid content of the sediment, which has been considered one of the best descriptors of reactive organic matter readily available to benthic consumers. We suggest that the irregular combination of sea ice coverage, organic matter production and supply to the sea floor introduce scatter in the determination of sediment and LOC ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Sea ice Digital.CSIC (Spanish National Research Council) Antarctic Antarctic Peninsula Geochimica et Cosmochimica Acta 242 34 50 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Antarctica 14C Biogeochemistry 210Pb Labile organic carbon Larsen ice shelves Marine sediment Ice shelf collapse |
spellingShingle |
Antarctica 14C Biogeochemistry 210Pb Labile organic carbon Larsen ice shelves Marine sediment Ice shelf collapse Isla, Enrique DeMaster, D.J. Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
topic_facet |
Antarctica 14C Biogeochemistry 210Pb Labile organic carbon Larsen ice shelves Marine sediment Ice shelf collapse |
description |
17 pages, 6 figures, 2 tables, 1 supplementary table Labile organic carbon (LOC) dynamics (i.e., of recently produced, planktonic material) and sediment dynamics were studied in the seabed using naturally occurring C and Pb measurements in the region where the Larsen Ice Shelves A and B were floating almost two decades ago. A non-steady-state diagenetic model was used to estimate sediment mixing coefficients as well as LOC fluxes to the seabed and LOC turnover times (i.e., mean residence times) in a suite of 14 sediment cores from the continental shelf, including a glacial trough. At four of the stations, cores were collected during 2007 and 2011 cruises, enabling a time-series approach for understanding the evolution of sedimentary processes and LOC dynamics in the deposits below a collapsed ice shelf. Sediment mixing coefficients, based on non-steady-state Pb profiles, varied between 0.01 cm y and 1.6 cm y in these post-ice shelf sediments. These values were similar to those found in polar deep-sea environments, where sedimentary conditions are less dynamic than in shallower provinces. LOC, whose abundance decreased uniformly with depth, was detected to depths ranging from 2 to 16 cm, with LOC seabed inventories varying from 1.5 to 22 mg LOC cm. Excess Pb and LOC fluxes were relatively uniform across the study area suggesting that similar particle fluxes have taken place within the Larsen system since the disintegration of the various ice shelves. The LOC mean residence time at the different stations varied from 3 y to >60 y. The C approach, calculating LOC content based on a two-end member model with planktonic C as the labile carbon end member, most closely correlated with the lipid content of the sediment, which has been considered one of the best descriptors of reactive organic matter readily available to benthic consumers. We suggest that the irregular combination of sea ice coverage, organic matter production and supply to the sea floor introduce scatter in the determination of sediment and LOC ... |
author2 |
Ministerio de Economía y Competitividad (España) National Science Foundation (US) |
format |
Article in Journal/Newspaper |
author |
Isla, Enrique DeMaster, D.J. |
author_facet |
Isla, Enrique DeMaster, D.J. |
author_sort |
Isla, Enrique |
title |
Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
title_short |
Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
title_full |
Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
title_fullStr |
Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
title_full_unstemmed |
Labile organic carbon dynamics in continental shelf sediments after the recent collapse of the Larsen ice shelves off the eastern Antarctic Peninsula: A radiochemical approach |
title_sort |
labile organic carbon dynamics in continental shelf sediments after the recent collapse of the larsen ice shelves off the eastern antarctic peninsula: a radiochemical approach |
publisher |
Meteoritical Society |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/172926 https://doi.org/10.1016/j.gca.2018.08.011 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100000001 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Sea ice |
op_relation |
https://doi.org/10.1016/j.gca.2018.08.011 Sí doi:10.1016/j.gca.2018.08.011 issn: 0016-7037 Geochimica et Cosmochimica Acta 242: 34-50 (2018) http://hdl.handle.net/10261/172926 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100000001 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.gca.2018.08.01110.13039/50110000332910.13039/100000001 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
242 |
container_start_page |
34 |
op_container_end_page |
50 |
_version_ |
1790603773588013056 |