Historical records of organic matter supply and degradation status in the East Siberian Sea
Destabilization and degradation of permafrost carbon in the Arctic regions could constitute a positive feedback to climate change. A better understanding of its fate upon discharge to the Arctic shelf is therefore needed. In this study, bulk carbon isotopes as well as terrigenous and marine biomarke...
Published in: | Organic Geochemistry |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/0b1391bb-076d-4570-ad88-8480ec7c78db https://doi.org/10.1016/j.orggeochem.2015.10.008 |
id |
ftdtupubl:oai:pure.atira.dk:publications/0b1391bb-076d-4570-ad88-8480ec7c78db |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/0b1391bb-076d-4570-ad88-8480ec7c78db 2024-06-23T07:49:51+00:00 Historical records of organic matter supply and degradation status in the East Siberian Sea Bröder, Lisa Tesi, Tommaso Andersson, August Eglinton, Timothy I. Semiletov, Igor P. Dudarev, Oleg V. Roos, Per Gustafsson, Örjan 2016 https://orbit.dtu.dk/en/publications/0b1391bb-076d-4570-ad88-8480ec7c78db https://doi.org/10.1016/j.orggeochem.2015.10.008 eng eng https://orbit.dtu.dk/en/publications/0b1391bb-076d-4570-ad88-8480ec7c78db info:eu-repo/semantics/closedAccess Bröder , L , Tesi , T , Andersson , A , Eglinton , T I , Semiletov , I P , Dudarev , O V , Roos , P & Gustafsson , Ö 2016 , ' Historical records of organic matter supply and degradation status in the East Siberian Sea ' , Organic Geochemistry , vol. 91 , pp. 16-30 . https://doi.org/10.1016/j.orggeochem.2015.10.008 210Pb Arctic East Siberian Arctic Shelf HMW wax lipids Lignin Monte Carlo δ13C Δ14C /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2016 ftdtupubl https://doi.org/10.1016/j.orggeochem.2015.10.008 2024-06-11T14:43:21Z Destabilization and degradation of permafrost carbon in the Arctic regions could constitute a positive feedback to climate change. A better understanding of its fate upon discharge to the Arctic shelf is therefore needed. In this study, bulk carbon isotopes as well as terrigenous and marine biomarkers were used to construct two centennial records in the East Siberian Sea. Differences in topsoil and Pleistocene Ice Complex Deposit permafrost concentrations, modeled using δ 13 C and δ 14 C, were larger between inner and outer shelf than the changes over time. Similarly, lignin-derived phenol and cutin acid concentrations differed by a factor of ten between the two stations, but did not change significantly over time, consistent with the dual-carbon isotope model. High molecular weight (HMW) n-alkane and n-alkanoic acid concentrations displayed a smaller difference between the two stations (factor of 3-6). By contrast, the fraction for marine OC drastically decreased during burial with a half-life of 19-27 years. Vegetation and degradation proxies suggested supply of highly degraded gymnosperm wood tissues. Lipid Carbon Preference Index (CPI) values indicated more extensively degraded HMW n-alkanes on the outer shelf with no change over time, whereas n-alkanoic acids appeared to be less degraded toward the core top with no large differences between the stations. Taken together, our results show larger across-shelf changes than down-core trends. Further investigation is required to establish whether the observed spatial differences are due to different sources for the two depositional settings or, alternatively, a consequence of hydrodynamic sorting combined with selective degradation during cross-shelf transport. Article in Journal/Newspaper Arctic Climate change East Siberian Sea Ice permafrost Technical University of Denmark: DTU Orbit Arctic East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Organic Geochemistry 91 16 30 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
210Pb Arctic East Siberian Arctic Shelf HMW wax lipids Lignin Monte Carlo δ13C Δ14C /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
210Pb Arctic East Siberian Arctic Shelf HMW wax lipids Lignin Monte Carlo δ13C Δ14C /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Bröder, Lisa Tesi, Tommaso Andersson, August Eglinton, Timothy I. Semiletov, Igor P. Dudarev, Oleg V. Roos, Per Gustafsson, Örjan Historical records of organic matter supply and degradation status in the East Siberian Sea |
topic_facet |
210Pb Arctic East Siberian Arctic Shelf HMW wax lipids Lignin Monte Carlo δ13C Δ14C /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Destabilization and degradation of permafrost carbon in the Arctic regions could constitute a positive feedback to climate change. A better understanding of its fate upon discharge to the Arctic shelf is therefore needed. In this study, bulk carbon isotopes as well as terrigenous and marine biomarkers were used to construct two centennial records in the East Siberian Sea. Differences in topsoil and Pleistocene Ice Complex Deposit permafrost concentrations, modeled using δ 13 C and δ 14 C, were larger between inner and outer shelf than the changes over time. Similarly, lignin-derived phenol and cutin acid concentrations differed by a factor of ten between the two stations, but did not change significantly over time, consistent with the dual-carbon isotope model. High molecular weight (HMW) n-alkane and n-alkanoic acid concentrations displayed a smaller difference between the two stations (factor of 3-6). By contrast, the fraction for marine OC drastically decreased during burial with a half-life of 19-27 years. Vegetation and degradation proxies suggested supply of highly degraded gymnosperm wood tissues. Lipid Carbon Preference Index (CPI) values indicated more extensively degraded HMW n-alkanes on the outer shelf with no change over time, whereas n-alkanoic acids appeared to be less degraded toward the core top with no large differences between the stations. Taken together, our results show larger across-shelf changes than down-core trends. Further investigation is required to establish whether the observed spatial differences are due to different sources for the two depositional settings or, alternatively, a consequence of hydrodynamic sorting combined with selective degradation during cross-shelf transport. |
format |
Article in Journal/Newspaper |
author |
Bröder, Lisa Tesi, Tommaso Andersson, August Eglinton, Timothy I. Semiletov, Igor P. Dudarev, Oleg V. Roos, Per Gustafsson, Örjan |
author_facet |
Bröder, Lisa Tesi, Tommaso Andersson, August Eglinton, Timothy I. Semiletov, Igor P. Dudarev, Oleg V. Roos, Per Gustafsson, Örjan |
author_sort |
Bröder, Lisa |
title |
Historical records of organic matter supply and degradation status in the East Siberian Sea |
title_short |
Historical records of organic matter supply and degradation status in the East Siberian Sea |
title_full |
Historical records of organic matter supply and degradation status in the East Siberian Sea |
title_fullStr |
Historical records of organic matter supply and degradation status in the East Siberian Sea |
title_full_unstemmed |
Historical records of organic matter supply and degradation status in the East Siberian Sea |
title_sort |
historical records of organic matter supply and degradation status in the east siberian sea |
publishDate |
2016 |
url |
https://orbit.dtu.dk/en/publications/0b1391bb-076d-4570-ad88-8480ec7c78db https://doi.org/10.1016/j.orggeochem.2015.10.008 |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) |
geographic |
Arctic East Siberian Sea |
geographic_facet |
Arctic East Siberian Sea |
genre |
Arctic Climate change East Siberian Sea Ice permafrost |
genre_facet |
Arctic Climate change East Siberian Sea Ice permafrost |
op_source |
Bröder , L , Tesi , T , Andersson , A , Eglinton , T I , Semiletov , I P , Dudarev , O V , Roos , P & Gustafsson , Ö 2016 , ' Historical records of organic matter supply and degradation status in the East Siberian Sea ' , Organic Geochemistry , vol. 91 , pp. 16-30 . https://doi.org/10.1016/j.orggeochem.2015.10.008 |
op_relation |
https://orbit.dtu.dk/en/publications/0b1391bb-076d-4570-ad88-8480ec7c78db |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.orggeochem.2015.10.008 |
container_title |
Organic Geochemistry |
container_volume |
91 |
container_start_page |
16 |
op_container_end_page |
30 |
_version_ |
1802640524020023296 |