Drivers of organic carbon distribution and accumulation in the northern Barents Sea
•Sedimentation rates (SR) are influenced by topography and particle size along the continental margin.•Sediment OC distribution is explained by spatial variability of sea ice and biological production.•There is no seasonality of sedimentary OC in the northern Barents Sea.•Slow SR, high degradation,...
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| Veröffentlicht in: | Progress in oceanography 2024-07, Vol.225, p.103286, Article 103286 |
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| creator | Ricardo de Freitas, Thaise Hess, Silvia Renaud, Paul E. Appleby, Peter Alve, Elisabeth |
| description | •Sedimentation rates (SR) are influenced by topography and particle size along the continental margin.•Sediment OC distribution is explained by spatial variability of sea ice and biological production.•There is no seasonality of sedimentary OC in the northern Barents Sea.•Slow SR, high degradation, and long residence time in the water column lead to low and stable ARtoc.•High TOC north of the Polar Front signals a northeastward AW intrusion into the northern Barents Sea.
Sedimentary properties and accumulation rates on the continental shelf and in the deep sea reflect temporal oceanographic, biological and chemical processes occurring in the water column and the sediment surface. We used the radionuclides 210Pb, 226Ra, and 137Cs activities to estimate sedimentation rates during the last century at nine stations in the northern Barents Sea region. Elemental (C, N) and stable isotopic composition (δ13C, δ15N) were also analysed from the nine stations sampled in August 2018, and, for five other stations sampled in August and December 2019, and in March and May 2021. Sediment accumulation rates varied between 130 and 1 410 g m−2 y−1. The |
| doi_str_mv | 10.1016/j.pocean.2024.103286 |
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Sedimentary properties and accumulation rates on the continental shelf and in the deep sea reflect temporal oceanographic, biological and chemical processes occurring in the water column and the sediment surface. We used the radionuclides 210Pb, 226Ra, and 137Cs activities to estimate sedimentation rates during the last century at nine stations in the northern Barents Sea region. Elemental (C, N) and stable isotopic composition (δ13C, δ15N) were also analysed from the nine stations sampled in August 2018, and, for five other stations sampled in August and December 2019, and in March and May 2021. Sediment accumulation rates varied between 130 and 1 410 g m−2 y−1. The < 63 μm normalized total organic carbon (TOC63) and the total nitrogen from the sediment surface varied between 0.90–2.56 % and 0.13–0.33 %, respectively. Ice-free shelf stations had higher TOC63 and possibly fresher organic matter (high δ13C, low δ15N) than ice-covered more northern stations. The opposite trend was observed for total inorganic carbon. We found that these trends in biogeochemical parameters were spatially structured by the winter sea ice concentration and biological production differences, and exhibited a south-north separation of the Polar Front region. The low and stable organic carbon accumulation rate (1.7–13.4 g Corg m-2 y−1; ARtoc) is a function of slow sedimentation rates, and high degradation and residence time in the water column and at the sediment–water interface. Overall, the ARtoc has been stable for the past 100 years, with a slight increase from the early 1970s to the present at the shelf and slope stations. Our results highlight that spatial scales of variability of the studied sedimentary parameters are linked to spatial patterns of important environmental variables (e.g., chlorophyll-a, sea ice concentration) in the region. In contrast, no seasonal differences were observed in the sediment parameters of revisited stations, and the dated sediment geochemical profiles did not exhibit substantial longer-term variation. This means that climate-induced changes in variables that modify the sedimentary geochemistry of the environment may affect benthic community activity and structure before leaving a record in ARtoc.</description><identifier>ISSN: 0079-6611</identifier><identifier>EISSN: 1873-4472</identifier><identifier>DOI: 10.1016/j.pocean.2024.103286</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>210Pb-dating ; Arctic Ocean ; Barents Sea ; benthic organisms ; biological production ; cesium radioisotopes ; chlorophyll ; climatic factors ; continental shelf ; geochemistry ; inorganic carbon ; oceanography ; Organic carbon ; Polar Front ; sea ice ; Sediment accumulation ; sediment-water interface ; sediments ; Spitsbergen ; total nitrogen ; total organic carbon</subject><ispartof>Progress in oceanography, 2024-07, Vol.225, p.103286, Article 103286</ispartof><rights>2024 The Author(s)</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c264t-3f4816247a3b3d9d40efa11c77083d9f4cee74bbb02400603ae7b7d6ffcdd7b83</cites><orcidid>0000-0002-6945-1841</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0079661124000922$$EHTML$$P50$$Gelsevier$$Hfree_for_read</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Ricardo de Freitas, Thaise</creatorcontrib><creatorcontrib>Hess, Silvia</creatorcontrib><creatorcontrib>Renaud, Paul E.</creatorcontrib><creatorcontrib>Appleby, Peter</creatorcontrib><creatorcontrib>Alve, Elisabeth</creatorcontrib><title>Drivers of organic carbon distribution and accumulation in the northern Barents Sea</title><title>Progress in oceanography</title><description>•Sedimentation rates (SR) are influenced by topography and particle size along the continental margin.•Sediment OC distribution is explained by spatial variability of sea ice and biological production.•There is no seasonality of sedimentary OC in the northern Barents Sea.•Slow SR, high degradation, and long residence time in the water column lead to low and stable ARtoc.•High TOC north of the Polar Front signals a northeastward AW intrusion into the northern Barents Sea.
Sedimentary properties and accumulation rates on the continental shelf and in the deep sea reflect temporal oceanographic, biological and chemical processes occurring in the water column and the sediment surface. We used the radionuclides 210Pb, 226Ra, and 137Cs activities to estimate sedimentation rates during the last century at nine stations in the northern Barents Sea region. Elemental (C, N) and stable isotopic composition (δ13C, δ15N) were also analysed from the nine stations sampled in August 2018, and, for five other stations sampled in August and December 2019, and in March and May 2021. Sediment accumulation rates varied between 130 and 1 410 g m−2 y−1. The < 63 μm normalized total organic carbon (TOC63) and the total nitrogen from the sediment surface varied between 0.90–2.56 % and 0.13–0.33 %, respectively. Ice-free shelf stations had higher TOC63 and possibly fresher organic matter (high δ13C, low δ15N) than ice-covered more northern stations. The opposite trend was observed for total inorganic carbon. We found that these trends in biogeochemical parameters were spatially structured by the winter sea ice concentration and biological production differences, and exhibited a south-north separation of the Polar Front region. The low and stable organic carbon accumulation rate (1.7–13.4 g Corg m-2 y−1; ARtoc) is a function of slow sedimentation rates, and high degradation and residence time in the water column and at the sediment–water interface. Overall, the ARtoc has been stable for the past 100 years, with a slight increase from the early 1970s to the present at the shelf and slope stations. Our results highlight that spatial scales of variability of the studied sedimentary parameters are linked to spatial patterns of important environmental variables (e.g., chlorophyll-a, sea ice concentration) in the region. In contrast, no seasonal differences were observed in the sediment parameters of revisited stations, and the dated sediment geochemical profiles did not exhibit substantial longer-term variation. This means that climate-induced changes in variables that modify the sedimentary geochemistry of the environment may affect benthic community activity and structure before leaving a record in ARtoc.</description><subject>210Pb-dating</subject><subject>Arctic Ocean</subject><subject>Barents Sea</subject><subject>benthic organisms</subject><subject>biological production</subject><subject>cesium radioisotopes</subject><subject>chlorophyll</subject><subject>climatic factors</subject><subject>continental shelf</subject><subject>geochemistry</subject><subject>inorganic carbon</subject><subject>oceanography</subject><subject>Organic carbon</subject><subject>Polar Front</subject><subject>sea ice</subject><subject>Sediment accumulation</subject><subject>sediment-water interface</subject><subject>sediments</subject><subject>Spitsbergen</subject><subject>total nitrogen</subject><subject>total organic carbon</subject><issn>0079-6611</issn><issn>1873-4472</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNp9UEtLAzEYDKJgrf4DDzl62ZqXyfYiaH1CwUP1HPL4oiltUpNdwX_v1vXsaZhhZmAGoXNKZpRQebme7bIDk2aMMDFInLXyAE1oq3gjhGKHaEKImjdSUnqMTmpdE0IYkWyCVnclfkGpOAecy7tJ0WFnis0J-1i7Em3fxYGY5LFxrt_2G_MrxIS7D8AplwFKwremQOoqXoE5RUfBbCqc_eEUvT3cvy6emuXL4_PiZtk4JkXX8CBaKplQhlvu514QCIZSpxRpBx6EA1DCWjuMIkQSbkBZ5WUIzntlWz5FF2PvruTPHmqnt7E62GxMgtxXzekVl5zSlg5WMVpdybUWCHpX4taUb02J3n-o13r8UO8_1OOHQ-x6jMEw4ytC0dVFSA58LOA67XP8v-AH0ed9BQ</recordid><startdate>20240701</startdate><enddate>20240701</enddate><creator>Ricardo de Freitas, Thaise</creator><creator>Hess, Silvia</creator><creator>Renaud, Paul E.</creator><creator>Appleby, Peter</creator><creator>Alve, Elisabeth</creator><general>Elsevier Ltd</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7S9</scope><scope>L.6</scope><orcidid>https://orcid.org/0000-0002-6945-1841</orcidid></search><sort><creationdate>20240701</creationdate><title>Drivers of organic carbon distribution and accumulation in the northern Barents Sea</title><author>Ricardo de Freitas, Thaise ; Hess, Silvia ; Renaud, Paul E. ; Appleby, Peter ; Alve, Elisabeth</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c264t-3f4816247a3b3d9d40efa11c77083d9f4cee74bbb02400603ae7b7d6ffcdd7b83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>210Pb-dating</topic><topic>Arctic Ocean</topic><topic>Barents Sea</topic><topic>benthic organisms</topic><topic>biological production</topic><topic>cesium radioisotopes</topic><topic>chlorophyll</topic><topic>climatic factors</topic><topic>continental shelf</topic><topic>geochemistry</topic><topic>inorganic carbon</topic><topic>oceanography</topic><topic>Organic carbon</topic><topic>Polar Front</topic><topic>sea ice</topic><topic>Sediment accumulation</topic><topic>sediment-water interface</topic><topic>sediments</topic><topic>Spitsbergen</topic><topic>total nitrogen</topic><topic>total organic carbon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ricardo de Freitas, Thaise</creatorcontrib><creatorcontrib>Hess, Silvia</creatorcontrib><creatorcontrib>Renaud, Paul E.</creatorcontrib><creatorcontrib>Appleby, Peter</creatorcontrib><creatorcontrib>Alve, Elisabeth</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><jtitle>Progress in oceanography</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ricardo de Freitas, Thaise</au><au>Hess, Silvia</au><au>Renaud, Paul E.</au><au>Appleby, Peter</au><au>Alve, Elisabeth</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Drivers of organic carbon distribution and accumulation in the northern Barents Sea</atitle><jtitle>Progress in oceanography</jtitle><date>2024-07-01</date><risdate>2024</risdate><volume>225</volume><spage>103286</spage><pages>103286-</pages><artnum>103286</artnum><issn>0079-6611</issn><eissn>1873-4472</eissn><abstract>•Sedimentation rates (SR) are influenced by topography and particle size along the continental margin.•Sediment OC distribution is explained by spatial variability of sea ice and biological production.•There is no seasonality of sedimentary OC in the northern Barents Sea.•Slow SR, high degradation, and long residence time in the water column lead to low and stable ARtoc.•High TOC north of the Polar Front signals a northeastward AW intrusion into the northern Barents Sea.
Sedimentary properties and accumulation rates on the continental shelf and in the deep sea reflect temporal oceanographic, biological and chemical processes occurring in the water column and the sediment surface. We used the radionuclides 210Pb, 226Ra, and 137Cs activities to estimate sedimentation rates during the last century at nine stations in the northern Barents Sea region. Elemental (C, N) and stable isotopic composition (δ13C, δ15N) were also analysed from the nine stations sampled in August 2018, and, for five other stations sampled in August and December 2019, and in March and May 2021. Sediment accumulation rates varied between 130 and 1 410 g m−2 y−1. The < 63 μm normalized total organic carbon (TOC63) and the total nitrogen from the sediment surface varied between 0.90–2.56 % and 0.13–0.33 %, respectively. Ice-free shelf stations had higher TOC63 and possibly fresher organic matter (high δ13C, low δ15N) than ice-covered more northern stations. The opposite trend was observed for total inorganic carbon. We found that these trends in biogeochemical parameters were spatially structured by the winter sea ice concentration and biological production differences, and exhibited a south-north separation of the Polar Front region. The low and stable organic carbon accumulation rate (1.7–13.4 g Corg m-2 y−1; ARtoc) is a function of slow sedimentation rates, and high degradation and residence time in the water column and at the sediment–water interface. Overall, the ARtoc has been stable for the past 100 years, with a slight increase from the early 1970s to the present at the shelf and slope stations. Our results highlight that spatial scales of variability of the studied sedimentary parameters are linked to spatial patterns of important environmental variables (e.g., chlorophyll-a, sea ice concentration) in the region. In contrast, no seasonal differences were observed in the sediment parameters of revisited stations, and the dated sediment geochemical profiles did not exhibit substantial longer-term variation. This means that climate-induced changes in variables that modify the sedimentary geochemistry of the environment may affect benthic community activity and structure before leaving a record in ARtoc.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.pocean.2024.103286</doi><orcidid>https://orcid.org/0000-0002-6945-1841</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | 210Pb-dating Arctic Ocean Barents Sea benthic organisms biological production cesium radioisotopes chlorophyll climatic factors continental shelf geochemistry inorganic carbon oceanography Organic carbon Polar Front sea ice Sediment accumulation sediment-water interface sediments Spitsbergen total nitrogen total organic carbon |
| title | Drivers of organic carbon distribution and accumulation in the northern Barents Sea |
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