Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators
Global warming in high latitudes causes destabilization of vulnerable permafrost deposits followed by massive thaw-release of organic carbon. Permafrost-derived carbon may be buried in the nearshore sediments, transported towards the deeper basins or degraded into the greenhouse gases, potentially i...
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Online Access: | http://earchive.tpu.ru/handle/11683/65327 https://doi.org/10.3390/w12123511 |
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fttomskpuniv:oai:earchive.tpu.ru:11683/65327 2023-05-15T15:16:51+02:00 Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators Gershelis, Elena Vladimirovna Grinko, Andrey Alekseevich Oberemok, Irina Andreevna Klevantseva, Elizaveta Vasiljevna Poltavskaya, Natalina Aleksandrovna Ruban, Aleksey Sergeevich Chernykh, Denis Vyacheslavovich Leonov, Andrey Andreevich Guseva, Natalia Vladimirovna Semiletov, Igor Petrovich 2020 application/pdf http://earchive.tpu.ru/handle/11683/65327 https://doi.org/10.3390/w12123511 en eng MDPI AG Water. 2020. Vol. 12, iss. 12 Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators / E. V. Gershelis, A. A. Grinko, I. A. Oberemok [et al.] // Water. — 2020. — Vol. 12, iss. 12. — [3511, 12 p.]. http://earchive.tpu.ru/handle/11683/65327 doi:10.3390/w12123511 info:eu-repo/semantics/openAccess Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ CC-BY-NC Water органический углерод биомаркеры вечная мерзлота поверхностные отложения море Лаптевых organic carbon biomarkers Rock-Eval pyrolysis grain size permafrost surface sediments Laptev Sea Article info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 fttomskpuniv https://doi.org/10.3390/w12123511 2021-05-18T16:28:21Z Global warming in high latitudes causes destabilization of vulnerable permafrost deposits followed by massive thaw-release of organic carbon. Permafrost-derived carbon may be buried in the nearshore sediments, transported towards the deeper basins or degraded into the greenhouse gases, potentially initiating a positive feedback to climate change. In the present study, we aim to identify the sources, distribution and degradation state of organic matter (OM) stored in the surface sediments of the Laptev Sea (LS), which receives a large input of terrestrial carbon from both Lena River discharge and intense coastal erosion. We applied a suite of geochemical indicators including the Rock Eval parameters, traditionally used for the matured OM characterization, and terrestrial lipid biomarkers. In addition, we analyzed a comprehensive grain size data in order to assess hydrodynamic sedimentation regime across the LS shelf. Rock-Eval (RE) data characterize LS sedimentary OM with generally low hydrogen index (100–200 mg HC/g TOC) and oxygen index (200 and 300 CO2/g TOC) both increasing off to the continental slope. According to Tpeak values, there is a clear regional distinction between two groups (369–401 °C for the inner and mid shelf; 451–464 °C for the outer shelf). We suggest that permafrost-derived OM is traced across the shallow and mid depths with high Tpeak and slightly elevated HI values if compared to other Arctic continental margins. Molecular-based degradation indicators show a trend to more degraded terrestrial OC with increasing distance from the coast corroborating with RE results. However, we observed much less variation of the degradation markers down to the deeper sampling horizons, which supports the notion that the most active OM degradation in LS land-shelf system takes part during the cross-shelf transport, not while getting buried deeper. Article in Journal/Newspaper Arctic Climate change Global warming laptev Laptev Sea lena river permafrost вечная мерзлота Tomsk Polytechnic University (TPU): Electronic Archive Arctic Laptev Sea Water 12 12 3511 |
institution |
Open Polar |
collection |
Tomsk Polytechnic University (TPU): Electronic Archive |
op_collection_id |
fttomskpuniv |
language |
English |
topic |
органический углерод биомаркеры вечная мерзлота поверхностные отложения море Лаптевых organic carbon biomarkers Rock-Eval pyrolysis grain size permafrost surface sediments Laptev Sea |
spellingShingle |
органический углерод биомаркеры вечная мерзлота поверхностные отложения море Лаптевых organic carbon biomarkers Rock-Eval pyrolysis grain size permafrost surface sediments Laptev Sea Gershelis, Elena Vladimirovna Grinko, Andrey Alekseevich Oberemok, Irina Andreevna Klevantseva, Elizaveta Vasiljevna Poltavskaya, Natalina Aleksandrovna Ruban, Aleksey Sergeevich Chernykh, Denis Vyacheslavovich Leonov, Andrey Andreevich Guseva, Natalia Vladimirovna Semiletov, Igor Petrovich Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
topic_facet |
органический углерод биомаркеры вечная мерзлота поверхностные отложения море Лаптевых organic carbon biomarkers Rock-Eval pyrolysis grain size permafrost surface sediments Laptev Sea |
description |
Global warming in high latitudes causes destabilization of vulnerable permafrost deposits followed by massive thaw-release of organic carbon. Permafrost-derived carbon may be buried in the nearshore sediments, transported towards the deeper basins or degraded into the greenhouse gases, potentially initiating a positive feedback to climate change. In the present study, we aim to identify the sources, distribution and degradation state of organic matter (OM) stored in the surface sediments of the Laptev Sea (LS), which receives a large input of terrestrial carbon from both Lena River discharge and intense coastal erosion. We applied a suite of geochemical indicators including the Rock Eval parameters, traditionally used for the matured OM characterization, and terrestrial lipid biomarkers. In addition, we analyzed a comprehensive grain size data in order to assess hydrodynamic sedimentation regime across the LS shelf. Rock-Eval (RE) data characterize LS sedimentary OM with generally low hydrogen index (100–200 mg HC/g TOC) and oxygen index (200 and 300 CO2/g TOC) both increasing off to the continental slope. According to Tpeak values, there is a clear regional distinction between two groups (369–401 °C for the inner and mid shelf; 451–464 °C for the outer shelf). We suggest that permafrost-derived OM is traced across the shallow and mid depths with high Tpeak and slightly elevated HI values if compared to other Arctic continental margins. Molecular-based degradation indicators show a trend to more degraded terrestrial OC with increasing distance from the coast corroborating with RE results. However, we observed much less variation of the degradation markers down to the deeper sampling horizons, which supports the notion that the most active OM degradation in LS land-shelf system takes part during the cross-shelf transport, not while getting buried deeper. |
format |
Article in Journal/Newspaper |
author |
Gershelis, Elena Vladimirovna Grinko, Andrey Alekseevich Oberemok, Irina Andreevna Klevantseva, Elizaveta Vasiljevna Poltavskaya, Natalina Aleksandrovna Ruban, Aleksey Sergeevich Chernykh, Denis Vyacheslavovich Leonov, Andrey Andreevich Guseva, Natalia Vladimirovna Semiletov, Igor Petrovich |
author_facet |
Gershelis, Elena Vladimirovna Grinko, Andrey Alekseevich Oberemok, Irina Andreevna Klevantseva, Elizaveta Vasiljevna Poltavskaya, Natalina Aleksandrovna Ruban, Aleksey Sergeevich Chernykh, Denis Vyacheslavovich Leonov, Andrey Andreevich Guseva, Natalia Vladimirovna Semiletov, Igor Petrovich |
author_sort |
Gershelis, Elena Vladimirovna |
title |
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
title_short |
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
title_full |
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
title_fullStr |
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
title_full_unstemmed |
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators |
title_sort |
composition of sedimentary organic matter across the laptev sea shelf: evidences from rock-eval parameters and molecular indicators |
publisher |
MDPI AG |
publishDate |
2020 |
url |
http://earchive.tpu.ru/handle/11683/65327 https://doi.org/10.3390/w12123511 |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Climate change Global warming laptev Laptev Sea lena river permafrost вечная мерзлота |
genre_facet |
Arctic Climate change Global warming laptev Laptev Sea lena river permafrost вечная мерзлота |
op_source |
Water |
op_relation |
Water. 2020. Vol. 12, iss. 12 Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators / E. V. Gershelis, A. A. Grinko, I. A. Oberemok [et al.] // Water. — 2020. — Vol. 12, iss. 12. — [3511, 12 p.]. http://earchive.tpu.ru/handle/11683/65327 doi:10.3390/w12123511 |
op_rights |
info:eu-repo/semantics/openAccess Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.3390/w12123511 |
container_title |
Water |
container_volume |
12 |
container_issue |
12 |
container_start_page |
3511 |
_version_ |
1766347151424618496 |