Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation
Global climate change has had large impacts on the Arctic region including rapid reductions in sea ice and rapid increases in surface air temperatures. Documenting the consequences of these changes in the Arctic Ocean is difficult, however, because accessibility limits observations in space and time...
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ftunivalberta:oai:era.library.ualberta.ca:46235008-5fe8-4fb0-bdc8-e5df0cf15a7e 2024-06-23T07:50:09+00:00 Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation Yu, Xiaoxin Allen, Susan E. Francois, Roger Grenier, Melanie Myers, Paul G. Hu, Xianmin 2020-01-01 https://era.library.ualberta.ca/items/46235008-5fe8-4fb0-bdc8-e5df0cf15a7e https://doi.org/10.7939/r3-pxhk-2q03 English eng https://era.library.ualberta.ca/items/46235008-5fe8-4fb0-bdc8-e5df0cf15a7e doi:10.7939/r3-pxhk-2q03 © 2020. American Geophysical Union. All Rights Reserved. 230Th Canada Basin Circulation changes Geotraces Ocean modeling Article (Published) 2020 ftunivalberta https://doi.org/10.7939/r3-pxhk-2q03 2024-06-03T03:09:00Z Global climate change has had large impacts on the Arctic region including rapid reductions in sea ice and rapid increases in surface air temperatures. Documenting the consequences of these changes in the Arctic Ocean is difficult, however, because accessibility limits observations in space and time and aliases measurements. This problem can be alleviated by using geochemical tracers, which can act as natural integrators, allowing us to determine net changes over regions and years. One such tracer is 230Th. We use measurements and an off-line scavenging model forced by ANHA4, a regional configuration of the NEMO general circulation model, to investigate changes in the Canada Basin in the years 2002–2015. Observations show a clear decrease in 230Th in intermediate layers, particularly in the internal Canada Basin. The model reproduces the observed changes in 230Th concentration profiles. Using the model to determine the origin of the reduction shows that the decrease is due to both higher particle fluxes from increased productivity resulting from the reduction in sea ice cover and increased circulation and stirring by mesoscale eddies increasing lateral exchange between the productive coastal regions and less productive internal Canada Basin. The circulation model clearly shows increased velocities as the ice cover has decreased and storms have increased. Article in Journal/Newspaper Arctic Arctic Ocean canada basin Climate change Sea ice University of Alberta: Era - Education and Research Archive Arctic Arctic Ocean Canada |
institution |
Open Polar |
collection |
University of Alberta: Era - Education and Research Archive |
op_collection_id |
ftunivalberta |
language |
English |
topic |
230Th Canada Basin Circulation changes Geotraces Ocean modeling |
spellingShingle |
230Th Canada Basin Circulation changes Geotraces Ocean modeling Yu, Xiaoxin Allen, Susan E. Francois, Roger Grenier, Melanie Myers, Paul G. Hu, Xianmin Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
topic_facet |
230Th Canada Basin Circulation changes Geotraces Ocean modeling |
description |
Global climate change has had large impacts on the Arctic region including rapid reductions in sea ice and rapid increases in surface air temperatures. Documenting the consequences of these changes in the Arctic Ocean is difficult, however, because accessibility limits observations in space and time and aliases measurements. This problem can be alleviated by using geochemical tracers, which can act as natural integrators, allowing us to determine net changes over regions and years. One such tracer is 230Th. We use measurements and an off-line scavenging model forced by ANHA4, a regional configuration of the NEMO general circulation model, to investigate changes in the Canada Basin in the years 2002–2015. Observations show a clear decrease in 230Th in intermediate layers, particularly in the internal Canada Basin. The model reproduces the observed changes in 230Th concentration profiles. Using the model to determine the origin of the reduction shows that the decrease is due to both higher particle fluxes from increased productivity resulting from the reduction in sea ice cover and increased circulation and stirring by mesoscale eddies increasing lateral exchange between the productive coastal regions and less productive internal Canada Basin. The circulation model clearly shows increased velocities as the ice cover has decreased and storms have increased. |
format |
Article in Journal/Newspaper |
author |
Yu, Xiaoxin Allen, Susan E. Francois, Roger Grenier, Melanie Myers, Paul G. Hu, Xianmin |
author_facet |
Yu, Xiaoxin Allen, Susan E. Francois, Roger Grenier, Melanie Myers, Paul G. Hu, Xianmin |
author_sort |
Yu, Xiaoxin |
title |
Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
title_short |
Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
title_full |
Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
title_fullStr |
Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
title_full_unstemmed |
Modeling dissolved and particulate 230Thin the Canada Basin: Implications for recent changes in particle flux and intermediate circulation |
title_sort |
modeling dissolved and particulate 230thin the canada basin: implications for recent changes in particle flux and intermediate circulation |
publishDate |
2020 |
url |
https://era.library.ualberta.ca/items/46235008-5fe8-4fb0-bdc8-e5df0cf15a7e https://doi.org/10.7939/r3-pxhk-2q03 |
geographic |
Arctic Arctic Ocean Canada |
geographic_facet |
Arctic Arctic Ocean Canada |
genre |
Arctic Arctic Ocean canada basin Climate change Sea ice |
genre_facet |
Arctic Arctic Ocean canada basin Climate change Sea ice |
op_relation |
https://era.library.ualberta.ca/items/46235008-5fe8-4fb0-bdc8-e5df0cf15a7e doi:10.7939/r3-pxhk-2q03 |
op_rights |
© 2020. American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.7939/r3-pxhk-2q03 |
_version_ |
1802641022514102272 |