228Ra as a tracer for shelf water in the arctic ocean
During its formation on the vast Siberian shelves, Arctic surface water is strongly enriched in 228Ra. When 228Ra of surface samples from the Arctic interior is plotted against the river water component fr, derived from salinity, δ180 and silicate as tracers, a shelfwater end-member can be calculate...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
1995
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Online Access: | https://oceanrep.geomar.de/id/eprint/14243/ https://oceanrep.geomar.de/id/eprint/14243/1/1995_Rutgers_etal_Bauch_DSR_2.pdf https://doi.org/10.1016/0967-0645(95)00053-4 |
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ftoceanrep:oai:oceanrep.geomar.de:14243 2023-05-15T13:22:44+02:00 228Ra as a tracer for shelf water in the arctic ocean Rutgers Van Der Loeff, Michiel M. Key, Robert M. Scholten, Jan Bauch, Dorothea Michel, Andreas 1995 text https://oceanrep.geomar.de/id/eprint/14243/ https://oceanrep.geomar.de/id/eprint/14243/1/1995_Rutgers_etal_Bauch_DSR_2.pdf https://doi.org/10.1016/0967-0645(95)00053-4 en eng Elsevier https://oceanrep.geomar.de/id/eprint/14243/1/1995_Rutgers_etal_Bauch_DSR_2.pdf Rutgers Van Der Loeff, M. M., Key, R. M., Scholten, J., Bauch, D. and Michel, A. (1995) 228Ra as a tracer for shelf water in the arctic ocean. Deep-Sea Research Part II-Topical Studies in Oceanography, 42 (6). pp. 1533-1553. DOI 10.1016/0967-0645(95)00053-4 <https://doi.org/10.1016/0967-0645%2895%2900053-4>. doi:10.1016/0967-0645(95)00053-4 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1995 ftoceanrep https://doi.org/10.1016/0967-0645(95)00053-4 2023-04-07T15:03:55Z During its formation on the vast Siberian shelves, Arctic surface water is strongly enriched in 228Ra. When 228Ra of surface samples from the Arctic interior is plotted against the river water component fr, derived from salinity, δ180 and silicate as tracers, a shelfwater end-member can be calculated by extrapolation. Highest values occur in the core of the Transpolar Drift, indicating rapid transport of surface water, comparable to the known ice-drift pattern. Low values at Ice Island T3 are explained by radioactive decay (5.8 year half-life) during the long residence time of fresh and shelf-influenced water in the Beaufort Gyre. Some evidence of decay and, consequently, prolonged transit times is also observed in the southern Nansen Basin. Future research is required to establish the seasonal, interannual and spatial variability of 228Ra on the shelves in order to determine the full potential of 228Ra as a tracer for the origin and transport rates of shelfwater in the Arctic Basin. Apart from the usual 228Ra signature of bottom waters, the tracer is also observed in intermediate layers where it gives evidence of recent contact with slope or shelf sediments. The Atlantic Inflow along the Barents slope is enriched down to 2000 m. The return flow over the Amundsen Basin and Lomonosov Ridge carries a shelf signature of 228Ra and 228Th down to more than 1200 m depth, in agreement with the enrichment observed in 137Cs. Deeper maxima around 1900–2500 m in the Nansen Basin are interpreted as inflow of bottom water from the Norwegian Sea through Fram Strait. Article in Journal/Newspaper amundsen basin Arctic Arctic Basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge Nansen Basin Norwegian Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Arctic Ocean Norwegian Sea Deep Sea Research Part II: Topical Studies in Oceanography 42 6 1533 1553 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
During its formation on the vast Siberian shelves, Arctic surface water is strongly enriched in 228Ra. When 228Ra of surface samples from the Arctic interior is plotted against the river water component fr, derived from salinity, δ180 and silicate as tracers, a shelfwater end-member can be calculated by extrapolation. Highest values occur in the core of the Transpolar Drift, indicating rapid transport of surface water, comparable to the known ice-drift pattern. Low values at Ice Island T3 are explained by radioactive decay (5.8 year half-life) during the long residence time of fresh and shelf-influenced water in the Beaufort Gyre. Some evidence of decay and, consequently, prolonged transit times is also observed in the southern Nansen Basin. Future research is required to establish the seasonal, interannual and spatial variability of 228Ra on the shelves in order to determine the full potential of 228Ra as a tracer for the origin and transport rates of shelfwater in the Arctic Basin. Apart from the usual 228Ra signature of bottom waters, the tracer is also observed in intermediate layers where it gives evidence of recent contact with slope or shelf sediments. The Atlantic Inflow along the Barents slope is enriched down to 2000 m. The return flow over the Amundsen Basin and Lomonosov Ridge carries a shelf signature of 228Ra and 228Th down to more than 1200 m depth, in agreement with the enrichment observed in 137Cs. Deeper maxima around 1900–2500 m in the Nansen Basin are interpreted as inflow of bottom water from the Norwegian Sea through Fram Strait. |
format |
Article in Journal/Newspaper |
author |
Rutgers Van Der Loeff, Michiel M. Key, Robert M. Scholten, Jan Bauch, Dorothea Michel, Andreas |
spellingShingle |
Rutgers Van Der Loeff, Michiel M. Key, Robert M. Scholten, Jan Bauch, Dorothea Michel, Andreas 228Ra as a tracer for shelf water in the arctic ocean |
author_facet |
Rutgers Van Der Loeff, Michiel M. Key, Robert M. Scholten, Jan Bauch, Dorothea Michel, Andreas |
author_sort |
Rutgers Van Der Loeff, Michiel M. |
title |
228Ra as a tracer for shelf water in the arctic ocean |
title_short |
228Ra as a tracer for shelf water in the arctic ocean |
title_full |
228Ra as a tracer for shelf water in the arctic ocean |
title_fullStr |
228Ra as a tracer for shelf water in the arctic ocean |
title_full_unstemmed |
228Ra as a tracer for shelf water in the arctic ocean |
title_sort |
228ra as a tracer for shelf water in the arctic ocean |
publisher |
Elsevier |
publishDate |
1995 |
url |
https://oceanrep.geomar.de/id/eprint/14243/ https://oceanrep.geomar.de/id/eprint/14243/1/1995_Rutgers_etal_Bauch_DSR_2.pdf https://doi.org/10.1016/0967-0645(95)00053-4 |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amundsen Basin Arctic Arctic Ocean Norwegian Sea |
geographic_facet |
Amundsen Basin Arctic Arctic Ocean Norwegian Sea |
genre |
amundsen basin Arctic Arctic Basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge Nansen Basin Norwegian Sea |
genre_facet |
amundsen basin Arctic Arctic Basin Arctic Arctic Ocean Fram Strait Lomonosov Ridge Nansen Basin Norwegian Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/14243/1/1995_Rutgers_etal_Bauch_DSR_2.pdf Rutgers Van Der Loeff, M. M., Key, R. M., Scholten, J., Bauch, D. and Michel, A. (1995) 228Ra as a tracer for shelf water in the arctic ocean. Deep-Sea Research Part II-Topical Studies in Oceanography, 42 (6). pp. 1533-1553. DOI 10.1016/0967-0645(95)00053-4 <https://doi.org/10.1016/0967-0645%2895%2900053-4>. doi:10.1016/0967-0645(95)00053-4 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/0967-0645(95)00053-4 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
42 |
container_issue |
6 |
container_start_page |
1533 |
op_container_end_page |
1553 |
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1766366664916467712 |