Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia
The organic-carbon (OC) pool accumulated in Arctic permafrost (perennially frozen ground) equals the carbon stored in the modern atmosphere. To give an idea of how Yedoma region permafrost could respond under future climatic warming, we conducted a study to quantify the organic-matter quality (here...
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2015
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ftdoajarticles:oai:doaj.org/article:5e8d3b1e19bd4a0083b2dd32b753454c 2023-05-15T15:01:46+02:00 Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia J. Strauss L. Schirrmeister K. Mangelsdorf L. Eichhorn S. Wetterich U. Herzschuh 2015-04-01T00:00:00Z https://doi.org/10.5194/bg-12-2227-2015 https://doaj.org/article/5e8d3b1e19bd4a0083b2dd32b753454c EN eng Copernicus Publications http://www.biogeosciences.net/12/2227/2015/bg-12-2227-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-2227-2015 https://doaj.org/article/5e8d3b1e19bd4a0083b2dd32b753454c Biogeosciences, Vol 12, Iss 7, Pp 2227-2245 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-2227-2015 2022-12-31T05:54:16Z The organic-carbon (OC) pool accumulated in Arctic permafrost (perennially frozen ground) equals the carbon stored in the modern atmosphere. To give an idea of how Yedoma region permafrost could respond under future climatic warming, we conducted a study to quantify the organic-matter quality (here defined as the intrinsic potential to be further transformed, decomposed, and mineralized) of late Pleistocene (Yedoma) and Holocene (thermokarst) deposits on the Buor-Khaya Peninsula, northeast Siberia. The objective of this study was to develop a stratigraphic classified organic-matter quality characterization. For this purpose the degree of organic-matter decomposition was estimated by using a multiproxy approach. We applied sedimentological (grain-size analyses, bulk density, ice content) and geochemical parameters (total OC, stable carbon isotopes (δ 13 C), total organic carbon : nitrogen (C / N) ratios) as well as lipid biomarkers (n-alkanes, n-fatty acids, hopanes, triterpenoids, and biomarker indices, i.e., average chain length, carbon preference index (CPI), and higher-plant fatty-acid index (HPFA)). Our results show that the Yedoma and thermokarst organic-matter qualities for further decomposition exhibit no obvious degradation–depth trend. Relatively, the C / N and δ 13 C values and the HPFA index show a significantly better preservation of the organic matter stored in thermokarst deposits compared to Yedoma deposits. The CPI data suggest less degradation of the organic matter from both deposits, with a higher value for Yedoma organic matter. As the interquartile ranges of the proxies mostly overlap, we interpret this as indicating comparable quality for further decomposition for both kinds of deposits with likely better thermokarst organic-matter quality. Supported by principal component analyses, the sediment parameters and quality proxies of Yedoma and thermokarst deposits could not be unambiguously separated from each other. This revealed that the organic-matter vulnerability is heterogeneous and ... Article in Journal/Newspaper Arctic Ice permafrost Thermokarst Siberia Directory of Open Access Journals: DOAJ Articles Arctic Buor-Khaya ENVELOPE(127.803,127.803,72.287,72.287) Khaya ENVELOPE(135.167,135.167,60.567,60.567) Biogeosciences 12 7 2227 2245 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. Strauss L. Schirrmeister K. Mangelsdorf L. Eichhorn S. Wetterich U. Herzschuh Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The organic-carbon (OC) pool accumulated in Arctic permafrost (perennially frozen ground) equals the carbon stored in the modern atmosphere. To give an idea of how Yedoma region permafrost could respond under future climatic warming, we conducted a study to quantify the organic-matter quality (here defined as the intrinsic potential to be further transformed, decomposed, and mineralized) of late Pleistocene (Yedoma) and Holocene (thermokarst) deposits on the Buor-Khaya Peninsula, northeast Siberia. The objective of this study was to develop a stratigraphic classified organic-matter quality characterization. For this purpose the degree of organic-matter decomposition was estimated by using a multiproxy approach. We applied sedimentological (grain-size analyses, bulk density, ice content) and geochemical parameters (total OC, stable carbon isotopes (δ 13 C), total organic carbon : nitrogen (C / N) ratios) as well as lipid biomarkers (n-alkanes, n-fatty acids, hopanes, triterpenoids, and biomarker indices, i.e., average chain length, carbon preference index (CPI), and higher-plant fatty-acid index (HPFA)). Our results show that the Yedoma and thermokarst organic-matter qualities for further decomposition exhibit no obvious degradation–depth trend. Relatively, the C / N and δ 13 C values and the HPFA index show a significantly better preservation of the organic matter stored in thermokarst deposits compared to Yedoma deposits. The CPI data suggest less degradation of the organic matter from both deposits, with a higher value for Yedoma organic matter. As the interquartile ranges of the proxies mostly overlap, we interpret this as indicating comparable quality for further decomposition for both kinds of deposits with likely better thermokarst organic-matter quality. Supported by principal component analyses, the sediment parameters and quality proxies of Yedoma and thermokarst deposits could not be unambiguously separated from each other. This revealed that the organic-matter vulnerability is heterogeneous and ... |
format |
Article in Journal/Newspaper |
author |
J. Strauss L. Schirrmeister K. Mangelsdorf L. Eichhorn S. Wetterich U. Herzschuh |
author_facet |
J. Strauss L. Schirrmeister K. Mangelsdorf L. Eichhorn S. Wetterich U. Herzschuh |
author_sort |
J. Strauss |
title |
Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
title_short |
Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
title_full |
Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
title_fullStr |
Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
title_full_unstemmed |
Organic-matter quality of deep permafrost carbon – a study from Arctic Siberia |
title_sort |
organic-matter quality of deep permafrost carbon – a study from arctic siberia |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-2227-2015 https://doaj.org/article/5e8d3b1e19bd4a0083b2dd32b753454c |
long_lat |
ENVELOPE(127.803,127.803,72.287,72.287) ENVELOPE(135.167,135.167,60.567,60.567) |
geographic |
Arctic Buor-Khaya Khaya |
geographic_facet |
Arctic Buor-Khaya Khaya |
genre |
Arctic Ice permafrost Thermokarst Siberia |
genre_facet |
Arctic Ice permafrost Thermokarst Siberia |
op_source |
Biogeosciences, Vol 12, Iss 7, Pp 2227-2245 (2015) |
op_relation |
http://www.biogeosciences.net/12/2227/2015/bg-12-2227-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-12-2227-2015 https://doaj.org/article/5e8d3b1e19bd4a0083b2dd32b753454c |
op_doi |
https://doi.org/10.5194/bg-12-2227-2015 |
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Biogeosciences |
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12 |
container_issue |
7 |
container_start_page |
2227 |
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2245 |
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1766333784846761984 |