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

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

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Bibliographic Details
Main Authors: Isla, Enrique, DeMaster, D.J.
Other Authors: Ministerio de Economía y Competitividad (España)
Format: artículo biblioteca
Published: Meteoritical Society 2018-12
Subjects:Antarctica, 14C, Biogeochemistry, 210Pb, Labile organic carbon, Larsen ice shelves, Marine sediment, Ice shelf collapse,
Online Access:http://hdl.handle.net/10261/172926
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/100000001
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spelling dig-icm-es-10261-1729262020-12-13T09:10:44Z 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) Antarctica 14C Biogeochemistry 210Pb Labile organic carbon Larsen ice shelves Marine sediment Ice shelf collapse 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 dynamics such that short-term temporal (<5 years) and spatial trends could not be readily resolved This study was funded by the Spanish Ministry of Economy and Competitiveness through the project CLIMANT (POL2006-06399/CGL; E.I., Principal Investigator) and by the National Science Foundation of the USA (PLR-1341669; D.D., Principal Investigator) Peer Reviewed 2018-12-04T09:53:35Z 2018-12-04T09:53:35Z 2018-12 2018-12-04T09:53:37Z artículo http://purl.org/coar/resource_type/c_6501 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 10.1016/j.gca.2018.08.011 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100000001 https://doi.org/10.1016/j.gca.2018.08.011 Sí none Meteoritical Society
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
topic Antarctica
14C
Biogeochemistry
210Pb
Labile organic carbon
Larsen ice shelves
Marine sediment
Ice shelf collapse
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
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
description 17 pages, 6 figures, 2 tables, 1 supplementary table
author2 Ministerio de Economía y Competitividad (España)
author_facet Ministerio de Economía y Competitividad (España)
Isla, Enrique
DeMaster, D.J.
format artículo
topic_facet Antarctica
14C
Biogeochemistry
210Pb
Labile organic carbon
Larsen ice shelves
Marine sediment
Ice shelf collapse
author 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 2018-12
url http://hdl.handle.net/10261/172926
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/100000001
work_keys_str_mv AT islaenrique labileorganiccarbondynamicsincontinentalshelfsedimentsaftertherecentcollapseofthelarseniceshelvesofftheeasternantarcticpeninsulaaradiochemicalapproach
AT demasterdj labileorganiccarbondynamicsincontinentalshelfsedimentsaftertherecentcollapseofthelarseniceshelvesofftheeasternantarcticpeninsulaaradiochemicalapproach
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