Radioisotope constraints of Arctic deep water export to the North Atlantic
The export of deep water from the Arctic to the Atlantic contributes to the formation of North Atlantic Deep Water, a crucial component of global ocean circulation. Records of protactinium-231 (231Pa) and thorium-230 (230Th) in Arctic sediments can provide a measure of this export, but well-constrai...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/4tkn-j497 2023-05-15T14:32:29+02:00 Radioisotope constraints of Arctic deep water export to the North Atlantic Kipp, Lauren E. McManus, Jerry F. 2021 https://doi.org/10.7916/4tkn-j497 English eng https://doi.org/10.7916/4tkn-j497 Paleoceanography Chemical oceanography Ocean circulation Articles 2021 ftcolumbiauniv https://doi.org/10.7916/4tkn-j497 2022-06-25T22:19:54Z The export of deep water from the Arctic to the Atlantic contributes to the formation of North Atlantic Deep Water, a crucial component of global ocean circulation. Records of protactinium-231 (231Pa) and thorium-230 (230Th) in Arctic sediments can provide a measure of this export, but well-constrained sedimentary budgets of these isotopes have been difficult to achieve in the Arctic Ocean. Previous studies revealed a deficit of 231Pa in central Arctic sediments, implying that some 231Pa is either transported to the margins, where it may be removed in areas of higher particle flux, or exported from the Arctic via deep water advection. Here we investigate this “missing sink” of Arctic 231Pa and find moderately increased 231Pa deposition along Arctic margins. Nonetheless, we determine that most 231Pa missing from the central basin must be lost via advection into the Nordic Seas, requiring deep water advection of 1.1 – 6.4 Sv through Fram Strait. Article in Journal/Newspaper Arctic Arctic Ocean Fram Strait Nordic Seas North Atlantic Deep Water North Atlantic Columbia University: Academic Commons Arctic Arctic Ocean Central Basin ENVELOPE(43.000,43.000,73.500,73.500) |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Paleoceanography Chemical oceanography Ocean circulation |
spellingShingle |
Paleoceanography Chemical oceanography Ocean circulation Kipp, Lauren E. McManus, Jerry F. Radioisotope constraints of Arctic deep water export to the North Atlantic |
topic_facet |
Paleoceanography Chemical oceanography Ocean circulation |
description |
The export of deep water from the Arctic to the Atlantic contributes to the formation of North Atlantic Deep Water, a crucial component of global ocean circulation. Records of protactinium-231 (231Pa) and thorium-230 (230Th) in Arctic sediments can provide a measure of this export, but well-constrained sedimentary budgets of these isotopes have been difficult to achieve in the Arctic Ocean. Previous studies revealed a deficit of 231Pa in central Arctic sediments, implying that some 231Pa is either transported to the margins, where it may be removed in areas of higher particle flux, or exported from the Arctic via deep water advection. Here we investigate this “missing sink” of Arctic 231Pa and find moderately increased 231Pa deposition along Arctic margins. Nonetheless, we determine that most 231Pa missing from the central basin must be lost via advection into the Nordic Seas, requiring deep water advection of 1.1 – 6.4 Sv through Fram Strait. |
format |
Article in Journal/Newspaper |
author |
Kipp, Lauren E. McManus, Jerry F. |
author_facet |
Kipp, Lauren E. McManus, Jerry F. |
author_sort |
Kipp, Lauren E. |
title |
Radioisotope constraints of Arctic deep water export to the North Atlantic |
title_short |
Radioisotope constraints of Arctic deep water export to the North Atlantic |
title_full |
Radioisotope constraints of Arctic deep water export to the North Atlantic |
title_fullStr |
Radioisotope constraints of Arctic deep water export to the North Atlantic |
title_full_unstemmed |
Radioisotope constraints of Arctic deep water export to the North Atlantic |
title_sort |
radioisotope constraints of arctic deep water export to the north atlantic |
publishDate |
2021 |
url |
https://doi.org/10.7916/4tkn-j497 |
long_lat |
ENVELOPE(43.000,43.000,73.500,73.500) |
geographic |
Arctic Arctic Ocean Central Basin |
geographic_facet |
Arctic Arctic Ocean Central Basin |
genre |
Arctic Arctic Ocean Fram Strait Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
Arctic Arctic Ocean Fram Strait Nordic Seas North Atlantic Deep Water North Atlantic |
op_relation |
https://doi.org/10.7916/4tkn-j497 |
op_doi |
https://doi.org/10.7916/4tkn-j497 |
_version_ |
1766305876797292544 |