Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries
Decreasing sea ice extent caused by climate change is affecting the carbon cycle of the Arctic Ocean. In this study, surface sediments across the western Arctic Ocean are investigated to characterize sources of sedimentary organic carbon (OC). Bulk organic parameters (total organic carbon, total nit...
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Online Access: | https://doi.org/10.5194/cp-19-1305-2023 https://cp.copernicus.org/articles/19/1305/2023/ |
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ftcopernicus:oai:publications.copernicus.org:cp109071 2023-07-30T04:01:27+02:00 Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries Su, Liang Ren, Jian Sicre, Marie-Alexandrine Bai, Youcheng Zhao, Ruoshi Han, Xibing Li, Zhongqiao Jin, Haiyan Astakhov, Anatolii S. Shi, Xuefa Chen, Jianfang 2023-07-05 application/pdf https://doi.org/10.5194/cp-19-1305-2023 https://cp.copernicus.org/articles/19/1305/2023/ eng eng doi:10.5194/cp-19-1305-2023 https://cp.copernicus.org/articles/19/1305/2023/ eISSN: 1814-9332 Text 2023 ftcopernicus https://doi.org/10.5194/cp-19-1305-2023 2023-07-10T16:24:17Z Decreasing sea ice extent caused by climate change is affecting the carbon cycle of the Arctic Ocean. In this study, surface sediments across the western Arctic Ocean are investigated to characterize sources of sedimentary organic carbon (OC). Bulk organic parameters (total organic carbon, total nitrogen, δ 13 C org , and δ 15 N) and molecular organic biomarkers (e.g., sterols and highly branched isoprenoids – HBIs) are combined to distinguish between sympagic, pelagic, and terrestrial OC sources. Their downcore profiles generated at the Chukchi Sea R1 core site (74 ∘ N) are then used to evaluate changes in the relative contribution of these components of sedimentary OC over the last 200 years with decreasing sea ice. Our data evidence that, from the 1820s to the 1930s, prevailing high sea ice cover inhibited in situ primary production, resulting in prominent land-derived material in sediments. Then, from the 1930s to the 1980s, primary production started increasing with the gradual decline of summer sea ice. The ratio of sympagic and pelagic OC began to rise to account for the larger portion of sedimentary OC. Since the 1980s, accelerated sea ice loss led to enhanced primary production, stabilizing over the last decades due to freshwater-induced surface ocean stratification in summer. Text Arctic Arctic Ocean Chukchi Chukchi Sea Climate change Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Chukchi Sea Climate of the Past 19 7 1305 1320 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Decreasing sea ice extent caused by climate change is affecting the carbon cycle of the Arctic Ocean. In this study, surface sediments across the western Arctic Ocean are investigated to characterize sources of sedimentary organic carbon (OC). Bulk organic parameters (total organic carbon, total nitrogen, δ 13 C org , and δ 15 N) and molecular organic biomarkers (e.g., sterols and highly branched isoprenoids – HBIs) are combined to distinguish between sympagic, pelagic, and terrestrial OC sources. Their downcore profiles generated at the Chukchi Sea R1 core site (74 ∘ N) are then used to evaluate changes in the relative contribution of these components of sedimentary OC over the last 200 years with decreasing sea ice. Our data evidence that, from the 1820s to the 1930s, prevailing high sea ice cover inhibited in situ primary production, resulting in prominent land-derived material in sediments. Then, from the 1930s to the 1980s, primary production started increasing with the gradual decline of summer sea ice. The ratio of sympagic and pelagic OC began to rise to account for the larger portion of sedimentary OC. Since the 1980s, accelerated sea ice loss led to enhanced primary production, stabilizing over the last decades due to freshwater-induced surface ocean stratification in summer. |
format |
Text |
author |
Su, Liang Ren, Jian Sicre, Marie-Alexandrine Bai, Youcheng Zhao, Ruoshi Han, Xibing Li, Zhongqiao Jin, Haiyan Astakhov, Anatolii S. Shi, Xuefa Chen, Jianfang |
spellingShingle |
Su, Liang Ren, Jian Sicre, Marie-Alexandrine Bai, Youcheng Zhao, Ruoshi Han, Xibing Li, Zhongqiao Jin, Haiyan Astakhov, Anatolii S. Shi, Xuefa Chen, Jianfang Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
author_facet |
Su, Liang Ren, Jian Sicre, Marie-Alexandrine Bai, Youcheng Zhao, Ruoshi Han, Xibing Li, Zhongqiao Jin, Haiyan Astakhov, Anatolii S. Shi, Xuefa Chen, Jianfang |
author_sort |
Su, Liang |
title |
Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
title_short |
Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
title_full |
Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
title_fullStr |
Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
title_full_unstemmed |
Changing sources and burial of organic carbon in the Chukchi Sea sediments with retreating sea ice over recent centuries |
title_sort |
changing sources and burial of organic carbon in the chukchi sea sediments with retreating sea ice over recent centuries |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-1305-2023 https://cp.copernicus.org/articles/19/1305/2023/ |
geographic |
Arctic Arctic Ocean Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea Climate change Sea ice |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea Climate change Sea ice |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-19-1305-2023 https://cp.copernicus.org/articles/19/1305/2023/ |
op_doi |
https://doi.org/10.5194/cp-19-1305-2023 |
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Climate of the Past |
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19 |
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7 |
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1305 |
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1320 |
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1772812191956729856 |