Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea
The world's largest continental shelf, the East Siberian Shelf Sea, receives substantial input of terrestrial organic carbon (terr-OC) from both large rivers and erosion of its coastline. Degradation of organic matter from thawing permafrost in the Arctic is likely to increase, potentially crea...
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Copernicus Publications
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ftdoajarticles:oai:doaj.org/article:a346e32755524875b4e0165a80722996 2023-05-15T15:18:58+02:00 Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea E. S. Karlsson A. Charkin O. Dudarev I. Semiletov J. E. Vonk L. Sánchez-García A. Andersson Ö. Gustafsson 2011-07-01T00:00:00Z https://doi.org/10.5194/bg-8-1865-2011 https://doaj.org/article/a346e32755524875b4e0165a80722996 EN eng Copernicus Publications http://www.biogeosciences.net/8/1865/2011/bg-8-1865-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-1865-2011 1726-4170 1726-4189 https://doaj.org/article/a346e32755524875b4e0165a80722996 Biogeosciences, Vol 8, Iss 7, Pp 1865-1879 (2011) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2011 ftdoajarticles https://doi.org/10.5194/bg-8-1865-2011 2022-12-31T12:47:29Z The world's largest continental shelf, the East Siberian Shelf Sea, receives substantial input of terrestrial organic carbon (terr-OC) from both large rivers and erosion of its coastline. Degradation of organic matter from thawing permafrost in the Arctic is likely to increase, potentially creating a positive feedback mechanism to climate warming. This study focuses on the Buor-Khaya Bay (SE Laptev Sea), an area with strong terr-OC input from both coastal erosion and the Lena river. To better understand the fate of this terr-OC, molecular (acyl lipid biomarkers) and isotopic tools (stable carbon and radiocarbon isotopes) have been applied to both particulate organic carbon (POC) in surface water and sedimentary organic carbon (SOC) collected from the underlying surface sediments. Clear gradients in both extent of degradation and differences in source contributions were observed both between surface water POC and surface sediment SOC as well as over the 100 s km investigation scale (about 20 stations). Depleted δ 13 C-OC and high HMW/LMW n -alkane ratios signaled that terr-OC was dominating over marine/planktonic sources. Despite a shallow water column (10–40 m), the isotopic shift between SOC and POC varied systematically from +2 to +5 per mil for δ 13 C and from +300 to +450 for Δ 14 C from the Lena prodelta to the Buor-Khaya Cape. At the same time, the ratio of HMW n -alkanoic acids to HMW n -alkanes as well as HMW n -alkane CPI, both indicative of degradation, were 5–6 times greater in SOC than in POC. This suggests that terr-OC was substantially older yet less degraded in the surface sediment than in the surface waters. This unusual vertical degradation trend was only recently found also for the central East Siberian Sea. Numerical modeling (Monte Carlo simulations) with δ 13 C and Δ 14 C in both POC and SOC was applied to deduce the relative contribution of – plankton OC, surface soil layer OC and yedoma/mineral soil OC. This three end-member dual-carbon-isotopic mixing model suggests quite different ... Article in Journal/Newspaper Arctic East Siberian Sea laptev Laptev Sea lena river permafrost Directory of Open Access Journals: DOAJ Articles Arctic Buor-Khaya ENVELOPE(127.803,127.803,72.287,72.287) East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Khaya ENVELOPE(135.167,135.167,60.567,60.567) Laptev Sea Biogeosciences 8 7 1865 1879 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 E. S. Karlsson A. Charkin O. Dudarev I. Semiletov J. E. Vonk L. Sánchez-García A. Andersson Ö. Gustafsson Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The world's largest continental shelf, the East Siberian Shelf Sea, receives substantial input of terrestrial organic carbon (terr-OC) from both large rivers and erosion of its coastline. Degradation of organic matter from thawing permafrost in the Arctic is likely to increase, potentially creating a positive feedback mechanism to climate warming. This study focuses on the Buor-Khaya Bay (SE Laptev Sea), an area with strong terr-OC input from both coastal erosion and the Lena river. To better understand the fate of this terr-OC, molecular (acyl lipid biomarkers) and isotopic tools (stable carbon and radiocarbon isotopes) have been applied to both particulate organic carbon (POC) in surface water and sedimentary organic carbon (SOC) collected from the underlying surface sediments. Clear gradients in both extent of degradation and differences in source contributions were observed both between surface water POC and surface sediment SOC as well as over the 100 s km investigation scale (about 20 stations). Depleted δ 13 C-OC and high HMW/LMW n -alkane ratios signaled that terr-OC was dominating over marine/planktonic sources. Despite a shallow water column (10–40 m), the isotopic shift between SOC and POC varied systematically from +2 to +5 per mil for δ 13 C and from +300 to +450 for Δ 14 C from the Lena prodelta to the Buor-Khaya Cape. At the same time, the ratio of HMW n -alkanoic acids to HMW n -alkanes as well as HMW n -alkane CPI, both indicative of degradation, were 5–6 times greater in SOC than in POC. This suggests that terr-OC was substantially older yet less degraded in the surface sediment than in the surface waters. This unusual vertical degradation trend was only recently found also for the central East Siberian Sea. Numerical modeling (Monte Carlo simulations) with δ 13 C and Δ 14 C in both POC and SOC was applied to deduce the relative contribution of – plankton OC, surface soil layer OC and yedoma/mineral soil OC. This three end-member dual-carbon-isotopic mixing model suggests quite different ... |
format |
Article in Journal/Newspaper |
author |
E. S. Karlsson A. Charkin O. Dudarev I. Semiletov J. E. Vonk L. Sánchez-García A. Andersson Ö. Gustafsson |
author_facet |
E. S. Karlsson A. Charkin O. Dudarev I. Semiletov J. E. Vonk L. Sánchez-García A. Andersson Ö. Gustafsson |
author_sort |
E. S. Karlsson |
title |
Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
title_short |
Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
title_full |
Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
title_fullStr |
Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
title_full_unstemmed |
Carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the Buor-Khaya Bay, SE Laptev Sea |
title_sort |
carbon isotopes and lipid biomarker investigation of sources, transport and degradation of terrestrial organic matter in the buor-khaya bay, se laptev sea |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/bg-8-1865-2011 https://doaj.org/article/a346e32755524875b4e0165a80722996 |
long_lat |
ENVELOPE(127.803,127.803,72.287,72.287) ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(-162.267,-162.267,74.400,74.400) ENVELOPE(135.167,135.167,60.567,60.567) |
geographic |
Arctic Buor-Khaya East Siberian Sea East Siberian Shelf Khaya Laptev Sea |
geographic_facet |
Arctic Buor-Khaya East Siberian Sea East Siberian Shelf Khaya Laptev Sea |
genre |
Arctic East Siberian Sea laptev Laptev Sea lena river permafrost |
genre_facet |
Arctic East Siberian Sea laptev Laptev Sea lena river permafrost |
op_source |
Biogeosciences, Vol 8, Iss 7, Pp 1865-1879 (2011) |
op_relation |
http://www.biogeosciences.net/8/1865/2011/bg-8-1865-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-1865-2011 1726-4170 1726-4189 https://doaj.org/article/a346e32755524875b4e0165a80722996 |
op_doi |
https://doi.org/10.5194/bg-8-1865-2011 |
container_title |
Biogeosciences |
container_volume |
8 |
container_issue |
7 |
container_start_page |
1865 |
op_container_end_page |
1879 |
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1766349136410443776 |