Sediment accumulation and carbon burial in four hadal trench systems
Hadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different su...
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American Geophysical Union
2022
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ftuglasgow:oai:eprints.gla.ac.uk:281337 2023-05-15T16:59:23+02:00 Sediment accumulation and carbon burial in four hadal trench systems Oguri, Kazumasa Masqué, Pere Zabel, Matthias Stewart, Heather A. MacKinnon, Gillian Rowden, Ashley A. Berg, Peter Wenzhöfer, Frank Glud, Ronnie N. 2022-10 text https://eprints.gla.ac.uk/281337/ https://eprints.gla.ac.uk/281337/1/281337.pdf en eng American Geophysical Union https://eprints.gla.ac.uk/281337/1/281337.pdf Oguri, K., Masqué, P., Zabel, M., Stewart, H. A., MacKinnon, G. <http://eprints.gla.ac.uk/view/author/5217.html> , Rowden, A. A., Berg, P., Wenzhöfer, F. and Glud, R. N. (2022) Sediment accumulation and carbon burial in four hadal trench systems. Journal of Geophysical Research: Biogeosciences <https://eprints.gla.ac.uk/view/journal_volume/Journal_of_Geophysical_Research=3A_Biogeosciences.html>, 127(10), e2022JG006. (doi:10.1029/2022JG006814 <https://doi.org/10.1029/2022JG006814>) cc_by_4 CC-BY Articles PeerReviewed 2022 ftuglasgow https://doi.org/10.1029/2022JG006814 2022-10-27T22:10:39Z Hadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different surface ocean productivities; the eutrophic Atacama and Kuril-Kamchatka trenches, the mesotrophic Kermadec trench and the oligotrophic Mariana Trench. The study is based on the distributions of naturally occurring 210Pbex, 137Cs and total organic carbon from recovered sediment cores and by applying previously quantified benthic mineralization rates. Periods of steady deposition and discreet mass-wasting deposits were identified from the profiles and the latter were associated with historic recorded seismic events in the respective regions. During periods without mass wasting, the estimated focusing factors along trench axes were elevated, suggesting more or less continuous downslope focusing of material towards the interior of the trenches. The estimated organic carbon deposition rates during these periods exhibited extensive site-specific variability, but were generally similar to values encountered at much shallower settings such as continental slopes and margins. Organic carbon deposition rates during periods of steady deposition were not mirrored by surface ocean productivity, but appeared confounded by local bathymetry. The inclusion of deposition mediated by mass-wasting events enhanced the sediment and organic carbon accumulations for the past ∼150 years by up to a factor of ∼4. Thus, due to intensified downslope material focusing and infrequent mass-wasting events, hadal trenches are important sites for deposition and sequestration of organic carbon in the deep sea. Article in Journal/Newspaper Kamchatka University of Glasgow: Enlighten - Publications Journal of Geophysical Research: Biogeosciences 127 10 |
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Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
Hadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different surface ocean productivities; the eutrophic Atacama and Kuril-Kamchatka trenches, the mesotrophic Kermadec trench and the oligotrophic Mariana Trench. The study is based on the distributions of naturally occurring 210Pbex, 137Cs and total organic carbon from recovered sediment cores and by applying previously quantified benthic mineralization rates. Periods of steady deposition and discreet mass-wasting deposits were identified from the profiles and the latter were associated with historic recorded seismic events in the respective regions. During periods without mass wasting, the estimated focusing factors along trench axes were elevated, suggesting more or less continuous downslope focusing of material towards the interior of the trenches. The estimated organic carbon deposition rates during these periods exhibited extensive site-specific variability, but were generally similar to values encountered at much shallower settings such as continental slopes and margins. Organic carbon deposition rates during periods of steady deposition were not mirrored by surface ocean productivity, but appeared confounded by local bathymetry. The inclusion of deposition mediated by mass-wasting events enhanced the sediment and organic carbon accumulations for the past ∼150 years by up to a factor of ∼4. Thus, due to intensified downslope material focusing and infrequent mass-wasting events, hadal trenches are important sites for deposition and sequestration of organic carbon in the deep sea. |
format |
Article in Journal/Newspaper |
author |
Oguri, Kazumasa Masqué, Pere Zabel, Matthias Stewart, Heather A. MacKinnon, Gillian Rowden, Ashley A. Berg, Peter Wenzhöfer, Frank Glud, Ronnie N. |
spellingShingle |
Oguri, Kazumasa Masqué, Pere Zabel, Matthias Stewart, Heather A. MacKinnon, Gillian Rowden, Ashley A. Berg, Peter Wenzhöfer, Frank Glud, Ronnie N. Sediment accumulation and carbon burial in four hadal trench systems |
author_facet |
Oguri, Kazumasa Masqué, Pere Zabel, Matthias Stewart, Heather A. MacKinnon, Gillian Rowden, Ashley A. Berg, Peter Wenzhöfer, Frank Glud, Ronnie N. |
author_sort |
Oguri, Kazumasa |
title |
Sediment accumulation and carbon burial in four hadal trench systems |
title_short |
Sediment accumulation and carbon burial in four hadal trench systems |
title_full |
Sediment accumulation and carbon burial in four hadal trench systems |
title_fullStr |
Sediment accumulation and carbon burial in four hadal trench systems |
title_full_unstemmed |
Sediment accumulation and carbon burial in four hadal trench systems |
title_sort |
sediment accumulation and carbon burial in four hadal trench systems |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://eprints.gla.ac.uk/281337/ https://eprints.gla.ac.uk/281337/1/281337.pdf |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://eprints.gla.ac.uk/281337/1/281337.pdf Oguri, K., Masqué, P., Zabel, M., Stewart, H. A., MacKinnon, G. <http://eprints.gla.ac.uk/view/author/5217.html> , Rowden, A. A., Berg, P., Wenzhöfer, F. and Glud, R. N. (2022) Sediment accumulation and carbon burial in four hadal trench systems. Journal of Geophysical Research: Biogeosciences <https://eprints.gla.ac.uk/view/journal_volume/Journal_of_Geophysical_Research=3A_Biogeosciences.html>, 127(10), e2022JG006. (doi:10.1029/2022JG006814 <https://doi.org/10.1029/2022JG006814>) |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022JG006814 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
127 |
container_issue |
10 |
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1766051633611931648 |