Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic
Deep-sea bamboo corals (family Isididae) have been used as archives for reconstructing changes in the past ocean. However, uncertainties remain regarding the interpretation of geochemical signals from their organic nodes, specifically the water depth of the signals recorded by the coral. Here we exp...
Published in: | Geochimica et Cosmochimica Acta |
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Language: | English |
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2023
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Online Access: | https://hdl.handle.net/1983/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://research-information.bris.ac.uk/en/publications/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://doi.org/10.1016/j.gca.2023.03.019 https://www.sciencedirect.com/science/article/pii/S0016703723001345 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 2024-02-04T10:02:44+01:00 Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic Liu, Qian Robinson, Laura F. Hendy, Erica Prokopenko, Maria G. Stewart, Joseph A. Knowles, Timothy D.J. Li, Tao Samperiz, Ana 2023-05-01 https://hdl.handle.net/1983/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://research-information.bris.ac.uk/en/publications/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://doi.org/10.1016/j.gca.2023.03.019 https://www.sciencedirect.com/science/article/pii/S0016703723001345 eng eng info:eu-repo/semantics/openAccess Liu , Q , Robinson , L F , Hendy , E , Prokopenko , M G , Stewart , J A , Knowles , T D J , Li , T & Samperiz , A 2023 , ' Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic ' , Geochimica et Cosmochimica Acta , vol. 348 , pp. 296-308 . https://doi.org/10.1016/j.gca.2023.03.019 Deep-sea bamboo corals Organic node Bomb radiocarbon (C) Deep chlorophyll maximum Tropical Atlantic article 2023 ftubristolcris https://doi.org/10.1016/j.gca.2023.03.019 2024-01-11T23:49:48Z Deep-sea bamboo corals (family Isididae) have been used as archives for reconstructing changes in the past ocean. However, uncertainties remain regarding the interpretation of geochemical signals from their organic nodes, specifically the water depth of the signals recorded by the coral. Here we explore this question by measuring radiocarbon (14C) and nitrogen (15N) isotopic compositions of the organic nodes in six bamboo corals collected from the central and eastern tropical Atlantic between 700 m and 2000 m water depth. By comparing coral 14C to measured seawater data, regional shallow-water coral records and climate-model outputs, we find contrasting results between the two regions. Our bamboo coral 14C results from the eastern tropical Atlantic support previous studies that suggest organic node carbon is sourced primarily from the mixed layer of the ocean. By contrast, the 14C of bamboo coral organic nodes from the oligotrophic central Atlantic better correlates with the 14C content of the subsurface deep chlorophyll maximum layer rather than the surface mixed layer. Combined with nitrogen isotope data, this observation suggests that sinking and/or ambient zooplankton feeding on phytoplankton from the deep chlorophyll maximum layer can contribute a significant proportion of the diet of bamboo corals. These results suggest that the carbon source for bamboo corals organic nodes may not always reside in the mixed layer, especially in oligotrophic regions, which has implications for 14C-based age model development in bamboo corals. Article in Journal/Newspaper North Atlantic University of Bristol: Bristol Research Geochimica et Cosmochimica Acta 348 296 308 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Deep-sea bamboo corals Organic node Bomb radiocarbon (C) Deep chlorophyll maximum Tropical Atlantic |
spellingShingle |
Deep-sea bamboo corals Organic node Bomb radiocarbon (C) Deep chlorophyll maximum Tropical Atlantic Liu, Qian Robinson, Laura F. Hendy, Erica Prokopenko, Maria G. Stewart, Joseph A. Knowles, Timothy D.J. Li, Tao Samperiz, Ana Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
topic_facet |
Deep-sea bamboo corals Organic node Bomb radiocarbon (C) Deep chlorophyll maximum Tropical Atlantic |
description |
Deep-sea bamboo corals (family Isididae) have been used as archives for reconstructing changes in the past ocean. However, uncertainties remain regarding the interpretation of geochemical signals from their organic nodes, specifically the water depth of the signals recorded by the coral. Here we explore this question by measuring radiocarbon (14C) and nitrogen (15N) isotopic compositions of the organic nodes in six bamboo corals collected from the central and eastern tropical Atlantic between 700 m and 2000 m water depth. By comparing coral 14C to measured seawater data, regional shallow-water coral records and climate-model outputs, we find contrasting results between the two regions. Our bamboo coral 14C results from the eastern tropical Atlantic support previous studies that suggest organic node carbon is sourced primarily from the mixed layer of the ocean. By contrast, the 14C of bamboo coral organic nodes from the oligotrophic central Atlantic better correlates with the 14C content of the subsurface deep chlorophyll maximum layer rather than the surface mixed layer. Combined with nitrogen isotope data, this observation suggests that sinking and/or ambient zooplankton feeding on phytoplankton from the deep chlorophyll maximum layer can contribute a significant proportion of the diet of bamboo corals. These results suggest that the carbon source for bamboo corals organic nodes may not always reside in the mixed layer, especially in oligotrophic regions, which has implications for 14C-based age model development in bamboo corals. |
format |
Article in Journal/Newspaper |
author |
Liu, Qian Robinson, Laura F. Hendy, Erica Prokopenko, Maria G. Stewart, Joseph A. Knowles, Timothy D.J. Li, Tao Samperiz, Ana |
author_facet |
Liu, Qian Robinson, Laura F. Hendy, Erica Prokopenko, Maria G. Stewart, Joseph A. Knowles, Timothy D.J. Li, Tao Samperiz, Ana |
author_sort |
Liu, Qian |
title |
Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
title_short |
Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
title_full |
Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
title_fullStr |
Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
title_full_unstemmed |
Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic |
title_sort |
reinterpreting radiocarbon records in bamboo corals – new insights from the tropical north atlantic |
publishDate |
2023 |
url |
https://hdl.handle.net/1983/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://research-information.bris.ac.uk/en/publications/b4ed3eb5-343e-4cbd-a17b-51d6239ff164 https://doi.org/10.1016/j.gca.2023.03.019 https://www.sciencedirect.com/science/article/pii/S0016703723001345 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Liu , Q , Robinson , L F , Hendy , E , Prokopenko , M G , Stewart , J A , Knowles , T D J , Li , T & Samperiz , A 2023 , ' Reinterpreting radiocarbon records in bamboo corals – new insights from the tropical North Atlantic ' , Geochimica et Cosmochimica Acta , vol. 348 , pp. 296-308 . https://doi.org/10.1016/j.gca.2023.03.019 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gca.2023.03.019 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
348 |
container_start_page |
296 |
op_container_end_page |
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