Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(8), (2020): e2020JC016068, doi:10.1029/2020JC01606...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/26408 2023-05-15T17:06:02+02:00 Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone Gonçalves Neto, Afonso Palter, Jaime B. Bower, Amy S. Furey, Heather H. Xu, Xiaobiao 2020-07-03 https://hdl.handle.net/1912/26408 unknown American Geophysical Union https://doi.org/10.1029/2020JC016068 Goncalves Neto, A., Palter, J. B., Bower, A., Furey, H., & Xu, X. (2020). Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone. Journal of Geophysical Research: Oceans, 125(8), e2020JC016068. https://hdl.handle.net/1912/26408 doi:10.1029/2020JC016068 Goncalves Neto, A., Palter, J. B., Bower, A., Furey, H., & Xu, X. (2020). Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone. Journal of Geophysical Research: Oceans, 125(8), e2020JC016068. doi:10.1029/2020JC016068 Article 2020 ftwhoas https://doi.org/10.1029/2020JC016068 2022-05-28T23:03:52Z Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(8), (2020): e2020JC016068, doi:10.1029/2020JC016068. Labrador Sea Water (LSW) is a major component of the deep limb of the Atlantic Meridional Overturning Circulation, yet LSW transport pathways and their variability lack a complete description. A portion of the LSW exported from the subpolar gyre is advected eastward along the North Atlantic Current and must contend with the Mid‐Atlantic Ridge before reaching the eastern basins of the North Atlantic. Here, we analyze observations from a mooring array and satellite altimetry, together with outputs from a hindcast ocean model simulation, to estimate the mean transport of LSW across the Charlie‐Gibbs Fracture Zone (CGFZ), a primary gateway for the eastward transport of the water mass. The LSW transport estimated from the 25‐year altimetry record is 5.3 ± 2.9 Sv, where the error represents the combination of observational variability and the uncertainty in the projection of the surface velocities to the LSW layer. Current velocities modulate the interannual to higher‐frequency variability of the LSW transport at the CGFZ, while the LSW thickness becomes important on longer time scales. The modeled mean LSW transport for 1993–2012 is higher than the estimate from altimetry, at 8.2 ± 4.1 Sv. The modeled LSW thickness decreases substantially at the CGFZ between 1996 and 2009, consistent with an observed decline in LSW volume in the Labrador Sea after 1994. We suggest that satellite altimetry and continuous hydrographic measurements in the central Labrador Sea, supplemented by profiles from Argo floats, could be sufficient to quantify the LSW transport at the CGFZ. A. G. N. appreciates conversations with Kathy Donohue, Tom Rossby and Lisa Beal, which helped to interpret the results. J. B. P. acknowledges support from ... Article in Journal/Newspaper Labrador Sea north atlantic current North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Mid-Atlantic Ridge Journal of Geophysical Research: Oceans 125 8 |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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description |
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(8), (2020): e2020JC016068, doi:10.1029/2020JC016068. Labrador Sea Water (LSW) is a major component of the deep limb of the Atlantic Meridional Overturning Circulation, yet LSW transport pathways and their variability lack a complete description. A portion of the LSW exported from the subpolar gyre is advected eastward along the North Atlantic Current and must contend with the Mid‐Atlantic Ridge before reaching the eastern basins of the North Atlantic. Here, we analyze observations from a mooring array and satellite altimetry, together with outputs from a hindcast ocean model simulation, to estimate the mean transport of LSW across the Charlie‐Gibbs Fracture Zone (CGFZ), a primary gateway for the eastward transport of the water mass. The LSW transport estimated from the 25‐year altimetry record is 5.3 ± 2.9 Sv, where the error represents the combination of observational variability and the uncertainty in the projection of the surface velocities to the LSW layer. Current velocities modulate the interannual to higher‐frequency variability of the LSW transport at the CGFZ, while the LSW thickness becomes important on longer time scales. The modeled mean LSW transport for 1993–2012 is higher than the estimate from altimetry, at 8.2 ± 4.1 Sv. The modeled LSW thickness decreases substantially at the CGFZ between 1996 and 2009, consistent with an observed decline in LSW volume in the Labrador Sea after 1994. We suggest that satellite altimetry and continuous hydrographic measurements in the central Labrador Sea, supplemented by profiles from Argo floats, could be sufficient to quantify the LSW transport at the CGFZ. A. G. N. appreciates conversations with Kathy Donohue, Tom Rossby and Lisa Beal, which helped to interpret the results. J. B. P. acknowledges support from ... |
format |
Article in Journal/Newspaper |
author |
Gonçalves Neto, Afonso Palter, Jaime B. Bower, Amy S. Furey, Heather H. Xu, Xiaobiao |
spellingShingle |
Gonçalves Neto, Afonso Palter, Jaime B. Bower, Amy S. Furey, Heather H. Xu, Xiaobiao Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
author_facet |
Gonçalves Neto, Afonso Palter, Jaime B. Bower, Amy S. Furey, Heather H. Xu, Xiaobiao |
author_sort |
Gonçalves Neto, Afonso |
title |
Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
title_short |
Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
title_full |
Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
title_fullStr |
Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
title_full_unstemmed |
Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone |
title_sort |
labrador sea water transport across the charlie-gibbs fracture zone |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/26408 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Labrador Sea north atlantic current North Atlantic |
genre_facet |
Labrador Sea north atlantic current North Atlantic |
op_source |
Goncalves Neto, A., Palter, J. B., Bower, A., Furey, H., & Xu, X. (2020). Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone. Journal of Geophysical Research: Oceans, 125(8), e2020JC016068. doi:10.1029/2020JC016068 |
op_relation |
https://doi.org/10.1029/2020JC016068 Goncalves Neto, A., Palter, J. B., Bower, A., Furey, H., & Xu, X. (2020). Labrador Sea Water transport across the Charlie-Gibbs Fracture Zone. Journal of Geophysical Research: Oceans, 125(8), e2020JC016068. https://hdl.handle.net/1912/26408 doi:10.1029/2020JC016068 |
op_doi |
https://doi.org/10.1029/2020JC016068 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
8 |
_version_ |
1766060944950034432 |