Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment
A high resolution time-series analysis of stable carbon isotopic signatures in particulate organic carbon (delta C-13(POC)) and associated biogeochemical parameters in sea ice and surface waters provides an insight into the factors affecting delta C-13(POC) in the coastal western Antarctic Peninsula...
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Language: | English |
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Copernicus Publications
2012
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Online Access: | http://nora.nerc.ac.uk/id/eprint/17930/ https://nora.nerc.ac.uk/id/eprint/17930/1/bg-9-1137-2012.pdf |
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ftnerc:oai:nora.nerc.ac.uk:17930 2023-05-15T13:45:12+02:00 Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment Henley, S.F. Annett, A.L. Ganeshram, R.S. Carson, D.S. Weston, K. Crosta, X. Tait, A. Dougans, J. Fallick, A.E. Clarke, A. 2012 text http://nora.nerc.ac.uk/id/eprint/17930/ https://nora.nerc.ac.uk/id/eprint/17930/1/bg-9-1137-2012.pdf en eng Copernicus Publications https://nora.nerc.ac.uk/id/eprint/17930/1/bg-9-1137-2012.pdf Henley, S.F.; Annett, A.L.; Ganeshram, R.S.; Carson, D.S.; Weston, K.; Crosta, X.; Tait, A.; Dougans, J.; Fallick, A.E.; Clarke, A. orcid:0000-0002-7582-3074 . 2012 Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment. Biogeosciences, 9 (3). 1137-1157. https://doi.org/10.5194/bg-9-1137-2012 <https://doi.org/10.5194/bg-9-1137-2012> Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.5194/bg-9-1137-2012 2023-02-04T19:31:25Z A high resolution time-series analysis of stable carbon isotopic signatures in particulate organic carbon (delta C-13(POC)) and associated biogeochemical parameters in sea ice and surface waters provides an insight into the factors affecting delta C-13(POC) in the coastal western Antarctic Peninsula sea ice environment. The study covers two austral summer seasons in Ryder Bay, northern Marguerite Bay between 2004 and 2006. A shift in diatom species composition during the 2005/06 summer bloom to near-complete biomass dominance of Proboscia inermis is strongly correlated with a large ~10 parts per thousand negative isotopic shift in delta C-13(POC) that cannot be explained by a concurrent change in concentration or isotopic signature of CO2. We hypothesise that the delta C-13(POC) shift may be driven by the contrasting biochemical mechanisms and utilisation of carbon-concentrating mechanisms (CCMs) in different diatom species. Specifically, very low delta C-13(POC) in P. inermis may be caused by the lack of a CCM, whilst some diatom species abundant at times of higher delta C-13(POC) may employ CCMs. These short-lived yet pronounced negative delta C-13(POC) excursions drive a 4 parts per thousand decrease in the seasonal average delta C-13(POC) signal, which is transferred to sediment traps and core-top sediments and consequently has the potential for preservation in the sedimentary record. This 4 parts per thousand difference between seasons of contrasting sea ice conditions and upper water column stratification matches the full amplitude of glacial-interglacial Southern Ocean delta C-13(POC) variability and, as such, we invoke phytoplankton species changes as a potentially important factor influencing sedimentary delta C-13(POC). We also find significantly higher delta C-13(POC) in sea ice than surface waters, consistent with autotrophic carbon fixation in a semi-closed environment and possible contributions from post-production degradation, biological utilisation of HCO3- and production of exopolymeric ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Sea ice Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean Antarctic Peninsula Austral Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) Ryder Bay ENVELOPE(-68.333,-68.333,-67.567,-67.567) Biogeosciences 9 3 1137 1157 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
A high resolution time-series analysis of stable carbon isotopic signatures in particulate organic carbon (delta C-13(POC)) and associated biogeochemical parameters in sea ice and surface waters provides an insight into the factors affecting delta C-13(POC) in the coastal western Antarctic Peninsula sea ice environment. The study covers two austral summer seasons in Ryder Bay, northern Marguerite Bay between 2004 and 2006. A shift in diatom species composition during the 2005/06 summer bloom to near-complete biomass dominance of Proboscia inermis is strongly correlated with a large ~10 parts per thousand negative isotopic shift in delta C-13(POC) that cannot be explained by a concurrent change in concentration or isotopic signature of CO2. We hypothesise that the delta C-13(POC) shift may be driven by the contrasting biochemical mechanisms and utilisation of carbon-concentrating mechanisms (CCMs) in different diatom species. Specifically, very low delta C-13(POC) in P. inermis may be caused by the lack of a CCM, whilst some diatom species abundant at times of higher delta C-13(POC) may employ CCMs. These short-lived yet pronounced negative delta C-13(POC) excursions drive a 4 parts per thousand decrease in the seasonal average delta C-13(POC) signal, which is transferred to sediment traps and core-top sediments and consequently has the potential for preservation in the sedimentary record. This 4 parts per thousand difference between seasons of contrasting sea ice conditions and upper water column stratification matches the full amplitude of glacial-interglacial Southern Ocean delta C-13(POC) variability and, as such, we invoke phytoplankton species changes as a potentially important factor influencing sedimentary delta C-13(POC). We also find significantly higher delta C-13(POC) in sea ice than surface waters, consistent with autotrophic carbon fixation in a semi-closed environment and possible contributions from post-production degradation, biological utilisation of HCO3- and production of exopolymeric ... |
format |
Article in Journal/Newspaper |
author |
Henley, S.F. Annett, A.L. Ganeshram, R.S. Carson, D.S. Weston, K. Crosta, X. Tait, A. Dougans, J. Fallick, A.E. Clarke, A. |
spellingShingle |
Henley, S.F. Annett, A.L. Ganeshram, R.S. Carson, D.S. Weston, K. Crosta, X. Tait, A. Dougans, J. Fallick, A.E. Clarke, A. Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
author_facet |
Henley, S.F. Annett, A.L. Ganeshram, R.S. Carson, D.S. Weston, K. Crosta, X. Tait, A. Dougans, J. Fallick, A.E. Clarke, A. |
author_sort |
Henley, S.F. |
title |
Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
title_short |
Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
title_full |
Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
title_fullStr |
Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
title_full_unstemmed |
Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment |
title_sort |
factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal antarctic sea ice environment |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/17930/ https://nora.nerc.ac.uk/id/eprint/17930/1/bg-9-1137-2012.pdf |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-68.333,-68.333,-67.566,-67.566) ENVELOPE(-68.333,-68.333,-67.567,-67.567) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Austral Marguerite Marguerite Bay Ryder Ryder Bay |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Austral Marguerite Marguerite Bay Ryder Ryder Bay |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/17930/1/bg-9-1137-2012.pdf Henley, S.F.; Annett, A.L.; Ganeshram, R.S.; Carson, D.S.; Weston, K.; Crosta, X.; Tait, A.; Dougans, J.; Fallick, A.E.; Clarke, A. orcid:0000-0002-7582-3074 . 2012 Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment. Biogeosciences, 9 (3). 1137-1157. https://doi.org/10.5194/bg-9-1137-2012 <https://doi.org/10.5194/bg-9-1137-2012> |
op_doi |
https://doi.org/10.5194/bg-9-1137-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
3 |
container_start_page |
1137 |
op_container_end_page |
1157 |
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1766216500280033280 |