Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica
In an effort to investigate the controlling factors behind Holocene delta C-13(org) changes in East Antarctica we report high-resolution down-core records of bulk organic matter carbon isotopic ratios (delta C-13(org)), diatom census counts, total organic carbon, and biogenic silica content taken fr...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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Amer Geophysical Union
2005
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Online Access: | https://archimer.ifremer.fr/doc/00230/34080/32534.pdf https://doi.org/10.1029/2004GB002426 https://archimer.ifremer.fr/doc/00230/34080/ |
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ftarchimer:oai:archimer.ifremer.fr:34080 2023-05-15T13:04:17+02:00 Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica Crosta, X Crespin, J Billy, I Ther, O 2005-12 application/pdf https://archimer.ifremer.fr/doc/00230/34080/32534.pdf https://doi.org/10.1029/2004GB002426 https://archimer.ifremer.fr/doc/00230/34080/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00230/34080/32534.pdf doi:10.1029/2004GB002426 https://archimer.ifremer.fr/doc/00230/34080/ Copyright 2005 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2005-12 , Vol. 19 , N. 4/GB4029 , P. 1-9 text Publication info:eu-repo/semantics/article 2005 ftarchimer https://doi.org/10.1029/2004GB002426 2021-09-23T20:25:14Z In an effort to investigate the controlling factors behind Holocene delta C-13(org) changes in East Antarctica we report high-resolution down-core records of bulk organic matter carbon isotopic ratios (delta C-13(org)), diatom census counts, total organic carbon, and biogenic silica content taken from one core recovered in the Adelie Trough. A good correspondence between the delta C-13(org) record and records of small/large and pennate/centric ratios in many of the core segments indicates that diatom species composition affected Holocene delta C-13(org) variations, possibly via diatom shape and size effects. Variations in the surface water CO2 concentration and in the isotopic composition of the source during the Holocene cannot be ruled out although they cannot explain rapid and large-amplitude delta C-13(org) changes. Within the limit of our investigation, our results argue against active carbon acquisition through a carbon concentration mechanism as evidenced in low-latitude upwelling systems. The bulk organic matter thus represents a mixing of diatom taxa having different fractionation affinity to aqueous CO2. Our results confirm previous evidence which demonstrates that delta C-13(org) down-core records should be used with great caution to reconstruct past CO2 content in surface waters. Article in Journal/Newspaper Adelie Land Antarc* Antarctica East Antarctica Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) East Antarctica Global Biogeochemical Cycles 19 4 n/a n/a |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
In an effort to investigate the controlling factors behind Holocene delta C-13(org) changes in East Antarctica we report high-resolution down-core records of bulk organic matter carbon isotopic ratios (delta C-13(org)), diatom census counts, total organic carbon, and biogenic silica content taken from one core recovered in the Adelie Trough. A good correspondence between the delta C-13(org) record and records of small/large and pennate/centric ratios in many of the core segments indicates that diatom species composition affected Holocene delta C-13(org) variations, possibly via diatom shape and size effects. Variations in the surface water CO2 concentration and in the isotopic composition of the source during the Holocene cannot be ruled out although they cannot explain rapid and large-amplitude delta C-13(org) changes. Within the limit of our investigation, our results argue against active carbon acquisition through a carbon concentration mechanism as evidenced in low-latitude upwelling systems. The bulk organic matter thus represents a mixing of diatom taxa having different fractionation affinity to aqueous CO2. Our results confirm previous evidence which demonstrates that delta C-13(org) down-core records should be used with great caution to reconstruct past CO2 content in surface waters. |
format |
Article in Journal/Newspaper |
author |
Crosta, X Crespin, J Billy, I Ther, O |
spellingShingle |
Crosta, X Crespin, J Billy, I Ther, O Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
author_facet |
Crosta, X Crespin, J Billy, I Ther, O |
author_sort |
Crosta, X |
title |
Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
title_short |
Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
title_full |
Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
title_fullStr |
Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
title_full_unstemmed |
Major factors controlling Holocene delta C-13(org) changes in a seasonal sea-ice environment, Adelie Land, East Antarctica |
title_sort |
major factors controlling holocene delta c-13(org) changes in a seasonal sea-ice environment, adelie land, east antarctica |
publisher |
Amer Geophysical Union |
publishDate |
2005 |
url |
https://archimer.ifremer.fr/doc/00230/34080/32534.pdf https://doi.org/10.1029/2004GB002426 https://archimer.ifremer.fr/doc/00230/34080/ |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Adelie Land Antarc* Antarctica East Antarctica Sea ice |
genre_facet |
Adelie Land Antarc* Antarctica East Antarctica Sea ice |
op_source |
Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2005-12 , Vol. 19 , N. 4/GB4029 , P. 1-9 |
op_relation |
https://archimer.ifremer.fr/doc/00230/34080/32534.pdf doi:10.1029/2004GB002426 https://archimer.ifremer.fr/doc/00230/34080/ |
op_rights |
Copyright 2005 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2004GB002426 |
container_title |
Global Biogeochemical Cycles |
container_volume |
19 |
container_issue |
4 |
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n/a |
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n/a |
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1766356516178231296 |