Estimating the recharge properties of the deep ocean using noble gases and helium isotopes
The distribution of noble gases and helium isotopes in the dense shelf waters of Antarctica reflects the boundary conditions near the ocean surface: airâ€sea exchange, sea ice formation, and subsurface ice melt. We use a nonlinear least squares solution to determine the value of the recharge tempera...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1535 2024-09-15T17:46:56+00:00 Estimating the recharge properties of the deep ocean using noble gases and helium isotopes Loose, Brice Jenkins, William J. Moriarty, Roisin Brown, Peter Jullion, Loic Naveiro Garabato, Alberto C. Torres Valdes, Sinhue Hoppema, Mario Ballentine, Chris Meredith, Michael P. 2016-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/549 https://doi.org/10.1002/2016JC011809 https://digitalcommons.uri.edu/context/gsofacpubs/article/1535/viewcontent/Loose_EstimatingRecharge_2016.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/549 doi:10.1002/2016JC011809 https://digitalcommons.uri.edu/context/gsofacpubs/article/1535/viewcontent/Loose_EstimatingRecharge_2016.pdf http://creativecommons.org/licenses/by-nc-nd/4.0/ Graduate School of Oceanography Faculty Publications text 2016 ftunivrhodeislan https://doi.org/10.1002/2016JC011809 2024-08-21T00:09:33Z The distribution of noble gases and helium isotopes in the dense shelf waters of Antarctica reflects the boundary conditions near the ocean surface: airâ€sea exchange, sea ice formation, and subsurface ice melt. We use a nonlinear least squares solution to determine the value of the recharge temperature and salinity, as well as the excess air injection and glacial meltwater content throughout the water column and in the precursor to Antarctic Bottom Water. The noble gasâ€derived recharge temperature and salinity in the Weddell Gyre are −1.95°C and 34.95 psu near 5500 m; these cold, salty recharge values are a result of surface cooling as well as brine rejection during sea ice formation in Antarctic polynyas. In comparison, the global value for deep water recharge temperature is −0.44°C at 5500 m, which is 1.5°C warmer than the southern hemisphere deep water recharge temperature, reflecting a distinct contribution from the north Atlantic. The contrast between northern and southern hemisphere recharge properties highlights the impact of sea ice formation on setting the gas properties in southern sourced deep water. Below 1000 m, glacial meltwater averages 3.5‰ by volume and represents greater than 50% of the excess neon and argon found in the water column. These results indicate glacial melt has a nonnegligible impact on the atmospheric gas content of Antarctic Bottom Water. Text Antarc* Antarctic Antarctica North Atlantic Sea ice University of Rhode Island: DigitalCommons@URI Journal of Geophysical Research: Oceans 121 8 5959 5979 |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
The distribution of noble gases and helium isotopes in the dense shelf waters of Antarctica reflects the boundary conditions near the ocean surface: airâ€sea exchange, sea ice formation, and subsurface ice melt. We use a nonlinear least squares solution to determine the value of the recharge temperature and salinity, as well as the excess air injection and glacial meltwater content throughout the water column and in the precursor to Antarctic Bottom Water. The noble gasâ€derived recharge temperature and salinity in the Weddell Gyre are −1.95°C and 34.95 psu near 5500 m; these cold, salty recharge values are a result of surface cooling as well as brine rejection during sea ice formation in Antarctic polynyas. In comparison, the global value for deep water recharge temperature is −0.44°C at 5500 m, which is 1.5°C warmer than the southern hemisphere deep water recharge temperature, reflecting a distinct contribution from the north Atlantic. The contrast between northern and southern hemisphere recharge properties highlights the impact of sea ice formation on setting the gas properties in southern sourced deep water. Below 1000 m, glacial meltwater averages 3.5‰ by volume and represents greater than 50% of the excess neon and argon found in the water column. These results indicate glacial melt has a nonnegligible impact on the atmospheric gas content of Antarctic Bottom Water. |
format |
Text |
author |
Loose, Brice Jenkins, William J. Moriarty, Roisin Brown, Peter Jullion, Loic Naveiro Garabato, Alberto C. Torres Valdes, Sinhue Hoppema, Mario Ballentine, Chris Meredith, Michael P. |
spellingShingle |
Loose, Brice Jenkins, William J. Moriarty, Roisin Brown, Peter Jullion, Loic Naveiro Garabato, Alberto C. Torres Valdes, Sinhue Hoppema, Mario Ballentine, Chris Meredith, Michael P. Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
author_facet |
Loose, Brice Jenkins, William J. Moriarty, Roisin Brown, Peter Jullion, Loic Naveiro Garabato, Alberto C. Torres Valdes, Sinhue Hoppema, Mario Ballentine, Chris Meredith, Michael P. |
author_sort |
Loose, Brice |
title |
Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
title_short |
Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
title_full |
Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
title_fullStr |
Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
title_full_unstemmed |
Estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
title_sort |
estimating the recharge properties of the deep ocean using noble gases and helium isotopes |
publisher |
DigitalCommons@URI |
publishDate |
2016 |
url |
https://digitalcommons.uri.edu/gsofacpubs/549 https://doi.org/10.1002/2016JC011809 https://digitalcommons.uri.edu/context/gsofacpubs/article/1535/viewcontent/Loose_EstimatingRecharge_2016.pdf |
genre |
Antarc* Antarctic Antarctica North Atlantic Sea ice |
genre_facet |
Antarc* Antarctic Antarctica North Atlantic Sea ice |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/549 doi:10.1002/2016JC011809 https://digitalcommons.uri.edu/context/gsofacpubs/article/1535/viewcontent/Loose_EstimatingRecharge_2016.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/2016JC011809 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
8 |
container_start_page |
5959 |
op_container_end_page |
5979 |
_version_ |
1810495377304977408 |