Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf
Selver, Ayça Dogrul (Balikesir Author) Mobilisation of terrestrial organic carbon (terrOC) from permafrost environments in eastern Siberia has the potential to deliver significant amounts of carbon to the Arctic Ocean, via both fluvial and coastal erosion. Eroded terrOC can be degraded during offsho...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Gesellschaft MBH
2016
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Online Access: | https://hdl.handle.net/20.500.12462/6683 https://doi.org/10.12697/10.5194/tc-10-2485-2016 |
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ftbalikesiruniv:oai:dspace.balikesir.edu.tr:20.500.12462/6683 |
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Open Polar |
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Balıkesir University Institutional Repository (DSpace@Balıkesir) |
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ftbalikesiruniv |
language |
English |
topic |
Lena River Old Carbon Laptev Sea Permafrost Coastal Degradation Delta-C-13 Erosion Alaska Ocean |
spellingShingle |
Lena River Old Carbon Laptev Sea Permafrost Coastal Degradation Delta-C-13 Erosion Alaska Ocean Sparkes, Robert B. Selver, Ayça Doǧrul Gustafsson, Orjan Semiletov, Igor P. Haghipour, Negar Wacker, Lukas Eglinton, Timothy I. Talbot, Helen M. Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
topic_facet |
Lena River Old Carbon Laptev Sea Permafrost Coastal Degradation Delta-C-13 Erosion Alaska Ocean |
description |
Selver, Ayça Dogrul (Balikesir Author) Mobilisation of terrestrial organic carbon (terrOC) from permafrost environments in eastern Siberia has the potential to deliver significant amounts of carbon to the Arctic Ocean, via both fluvial and coastal erosion. Eroded terrOC can be degraded during offshore transport or deposited across the wide East Siberian Arctic Shelf (ESAS). Most studies of terrOC on the ESAS have concentrated on solvent-extractable organic matter, but this represents only a small proportion of the total terrOC load. In this study we have used pyrolysis-gas chromatography-mass spectrometry (py-GCMS) to study all major groups of macromolecular components of the terrOC; this is the first time that this technique has been applied to the ESAS. This has shown that there is a strong offshore trend from terrestrial phenols, aromatics and cyclopentenones to marine pyridines. There is good agreement between proportion phenols measured using py-GCMS and independent quantification of lignin phenol concentrations (r(2) = 0.67, p < 0.01, n = 24). Furfurals, thought to represent carbohydrates, show no offshore trend and are likely found in both marine and terrestrial organic matter. We have also collected new radiocarbon data for bulk OC (C-14(OC)) which, when coupled with previous measurements, allows us to produce the most comprehensive C-14(OC) map of the ESAS to date. Combining the C-14(OC) and py-GCMS data suggests that the aromatics group of compounds is likely sourced from old, aged terrOC, in contrast to the phenols group, which is likely sourced from modern woody material. We propose that an index of the relative proportions of phenols and pyridines can be used as a novel terrestrial vs. marine proxy measurement for macromolecular organic matter. Principal component analysis found that various terrestrial vs. marine proxies show different patterns across the ESAS, and it shows that multiple river-ocean transects of surface sediments transition from river-dominated to coastalerosion-dominated to marine-dominated signatures. NERC research grant - NE/I024798/1 NE/I027967/1 Ministry of National Education - Turkey Government of the Russian Federation - 14.Z50.31.0012 Knut & Alice Wallenberg Foundation Russian Academy of Sciences Swedish Research Council - 621-2004-4039 621-2007-4631 621-2013-5297 US National Oceanic and Atmospheric Administration (OAR Climate Program Office) - NA08OAR4600758 Russian Foundation for Basic Research (RFBR) - 08-05-13572 08-05-00191-a 07-05-00050a Swedish Polar Research Secretariat Nordic Council of Ministers National Science Foundation (NSF) - OPP ARC 0909546 NERC Natural Environment Research Council - NE/I024798/1 NE/I027967/1 |
author2 |
Mühendislik Fakültesi orcid:0000-0001-8223-0536 orcid:0000-0003-0756-0150 orcid:0000-0003-1189-142X |
format |
Article in Journal/Newspaper |
author |
Sparkes, Robert B. Selver, Ayça Doǧrul Gustafsson, Orjan Semiletov, Igor P. Haghipour, Negar Wacker, Lukas Eglinton, Timothy I. Talbot, Helen M. |
author_facet |
Sparkes, Robert B. Selver, Ayça Doǧrul Gustafsson, Orjan Semiletov, Igor P. Haghipour, Negar Wacker, Lukas Eglinton, Timothy I. Talbot, Helen M. |
author_sort |
Sparkes, Robert B. |
title |
Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
title_short |
Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
title_full |
Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
title_fullStr |
Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
title_full_unstemmed |
Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf |
title_sort |
macromolecular composition of terrestrial and marine organic matter in sediments across the east siberian arctic shelf |
publisher |
Copernicus Gesellschaft MBH |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.12462/6683 https://doi.org/10.12697/10.5194/tc-10-2485-2016 |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Ocean laptev Laptev Sea lena river permafrost Swedish Polar Research Secretariat Alaska Siberia |
genre_facet |
Arctic Arctic Ocean laptev Laptev Sea lena river permafrost Swedish Polar Research Secretariat Alaska Siberia |
op_relation |
10.5194/tc-10-2485-2016 Cryosphere Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 1994-0416 1994-0424 https://doi.org/10.12697/10.5194/tc-10-2485-2016 https://hdl.handle.net/20.500.12462/6683 10 5 2485 2500 |
op_rights |
info:eu-repo/semantics/openAccess Attribution 3.0 United States https://creativecommons.org/licenses/by/3.0/us/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.12462/6683 https://doi.org/10.12697/10.5194/tc-10-2485-2016 |
_version_ |
1766333063871070208 |
spelling |
ftbalikesiruniv:oai:dspace.balikesir.edu.tr:20.500.12462/6683 2023-05-15T15:01:01+02:00 Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf Sparkes, Robert B. Selver, Ayça Doǧrul Gustafsson, Orjan Semiletov, Igor P. Haghipour, Negar Wacker, Lukas Eglinton, Timothy I. Talbot, Helen M. Mühendislik Fakültesi orcid:0000-0001-8223-0536 orcid:0000-0003-0756-0150 orcid:0000-0003-1189-142X 2016 application/pdf https://hdl.handle.net/20.500.12462/6683 https://doi.org/10.12697/10.5194/tc-10-2485-2016 eng eng Copernicus Gesellschaft MBH 10.5194/tc-10-2485-2016 Cryosphere Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 1994-0416 1994-0424 https://doi.org/10.12697/10.5194/tc-10-2485-2016 https://hdl.handle.net/20.500.12462/6683 10 5 2485 2500 info:eu-repo/semantics/openAccess Attribution 3.0 United States https://creativecommons.org/licenses/by/3.0/us/ CC-BY Lena River Old Carbon Laptev Sea Permafrost Coastal Degradation Delta-C-13 Erosion Alaska Ocean article 2016 ftbalikesiruniv https://doi.org/20.500.12462/6683 https://doi.org/10.12697/10.5194/tc-10-2485-2016 2022-04-27T05:35:10Z Selver, Ayça Dogrul (Balikesir Author) Mobilisation of terrestrial organic carbon (terrOC) from permafrost environments in eastern Siberia has the potential to deliver significant amounts of carbon to the Arctic Ocean, via both fluvial and coastal erosion. Eroded terrOC can be degraded during offshore transport or deposited across the wide East Siberian Arctic Shelf (ESAS). Most studies of terrOC on the ESAS have concentrated on solvent-extractable organic matter, but this represents only a small proportion of the total terrOC load. In this study we have used pyrolysis-gas chromatography-mass spectrometry (py-GCMS) to study all major groups of macromolecular components of the terrOC; this is the first time that this technique has been applied to the ESAS. This has shown that there is a strong offshore trend from terrestrial phenols, aromatics and cyclopentenones to marine pyridines. There is good agreement between proportion phenols measured using py-GCMS and independent quantification of lignin phenol concentrations (r(2) = 0.67, p < 0.01, n = 24). Furfurals, thought to represent carbohydrates, show no offshore trend and are likely found in both marine and terrestrial organic matter. We have also collected new radiocarbon data for bulk OC (C-14(OC)) which, when coupled with previous measurements, allows us to produce the most comprehensive C-14(OC) map of the ESAS to date. Combining the C-14(OC) and py-GCMS data suggests that the aromatics group of compounds is likely sourced from old, aged terrOC, in contrast to the phenols group, which is likely sourced from modern woody material. We propose that an index of the relative proportions of phenols and pyridines can be used as a novel terrestrial vs. marine proxy measurement for macromolecular organic matter. Principal component analysis found that various terrestrial vs. marine proxies show different patterns across the ESAS, and it shows that multiple river-ocean transects of surface sediments transition from river-dominated to coastalerosion-dominated to marine-dominated signatures. NERC research grant - NE/I024798/1 NE/I027967/1 Ministry of National Education - Turkey Government of the Russian Federation - 14.Z50.31.0012 Knut & Alice Wallenberg Foundation Russian Academy of Sciences Swedish Research Council - 621-2004-4039 621-2007-4631 621-2013-5297 US National Oceanic and Atmospheric Administration (OAR Climate Program Office) - NA08OAR4600758 Russian Foundation for Basic Research (RFBR) - 08-05-13572 08-05-00191-a 07-05-00050a Swedish Polar Research Secretariat Nordic Council of Ministers National Science Foundation (NSF) - OPP ARC 0909546 NERC Natural Environment Research Council - NE/I024798/1 NE/I027967/1 Article in Journal/Newspaper Arctic Arctic Ocean laptev Laptev Sea lena river permafrost Swedish Polar Research Secretariat Alaska Siberia Balıkesir University Institutional Repository (DSpace@Balıkesir) Arctic Arctic Ocean Laptev Sea |