Intensified turbulent mixing in the boundary current system of southern Greenland
The southern Greenland Deep Western Boundary Current (DWBC) advects major components of North Atlantic Deep Water. Turbulent diapycnal mixing rates of ∼10−4 m2 s−1 commonly occur in the DWBC. These diffusivities, estimated with an internal wave strain-based parameterisation, are independently confir...
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ftnerc:oai:nora.nerc.ac.uk:150658 2023-05-15T15:51:49+02:00 Intensified turbulent mixing in the boundary current system of southern Greenland Lauderdale, Jonathan M. Bacon, Sheldon Naveira Garabato, Alberto C. Holliday, N.Penny 2008-02-29 http://nora.nerc.ac.uk/id/eprint/150658/ https://doi.org/10.1029/2007GL032785 unknown Lauderdale, Jonathan M.; Bacon, Sheldon orcid:0000-0002-2471-9373 Naveira Garabato, Alberto C.; Holliday, N.Penny orcid:0000-0002-9733-8002 . 2008 Intensified turbulent mixing in the boundary current system of southern Greenland. Geophysical Research Letters, 35. L04611. https://doi.org/10.1029/2007GL032785 <https://doi.org/10.1029/2007GL032785> Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1029/2007GL032785 2023-02-04T19:34:56Z The southern Greenland Deep Western Boundary Current (DWBC) advects major components of North Atlantic Deep Water. Turbulent diapycnal mixing rates of ∼10−4 m2 s−1 commonly occur in the DWBC. These diffusivities, estimated with an internal wave strain-based parameterisation, are independently confirmed by budgets of density and dissolved O2. “Moderate” mixing rates (∼10−4 m2 s−1) over the DWBC path between Denmark Strait and Cape Farewell (∼1000 km) drive a similar net increase in volume transport by diapycnal entrainment to the more intense (∼10−3 m2 s−1), localised mixing rates found near the Denmark Strait overflow sill. Therefore turbulent mixing associated with the DWBC south of Denmark Strait is instrumental in establishing the magnitude of the North Atlantic Meridional Overturning Circulation. Elevated mixing rates are also seen in the East and West Greenland Currents; this may be significant in preconditioning seasonal restratification of the intermediate layers of the Irminger and Labrador basins. Article in Journal/Newspaper Cape Farewell Denmark Strait Greenland North Atlantic Deep Water North Atlantic Natural Environment Research Council: NERC Open Research Archive Greenland Geophysical Research Letters 35 4 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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description |
The southern Greenland Deep Western Boundary Current (DWBC) advects major components of North Atlantic Deep Water. Turbulent diapycnal mixing rates of ∼10−4 m2 s−1 commonly occur in the DWBC. These diffusivities, estimated with an internal wave strain-based parameterisation, are independently confirmed by budgets of density and dissolved O2. “Moderate” mixing rates (∼10−4 m2 s−1) over the DWBC path between Denmark Strait and Cape Farewell (∼1000 km) drive a similar net increase in volume transport by diapycnal entrainment to the more intense (∼10−3 m2 s−1), localised mixing rates found near the Denmark Strait overflow sill. Therefore turbulent mixing associated with the DWBC south of Denmark Strait is instrumental in establishing the magnitude of the North Atlantic Meridional Overturning Circulation. Elevated mixing rates are also seen in the East and West Greenland Currents; this may be significant in preconditioning seasonal restratification of the intermediate layers of the Irminger and Labrador basins. |
format |
Article in Journal/Newspaper |
author |
Lauderdale, Jonathan M. Bacon, Sheldon Naveira Garabato, Alberto C. Holliday, N.Penny |
spellingShingle |
Lauderdale, Jonathan M. Bacon, Sheldon Naveira Garabato, Alberto C. Holliday, N.Penny Intensified turbulent mixing in the boundary current system of southern Greenland |
author_facet |
Lauderdale, Jonathan M. Bacon, Sheldon Naveira Garabato, Alberto C. Holliday, N.Penny |
author_sort |
Lauderdale, Jonathan M. |
title |
Intensified turbulent mixing in the boundary current system of southern Greenland |
title_short |
Intensified turbulent mixing in the boundary current system of southern Greenland |
title_full |
Intensified turbulent mixing in the boundary current system of southern Greenland |
title_fullStr |
Intensified turbulent mixing in the boundary current system of southern Greenland |
title_full_unstemmed |
Intensified turbulent mixing in the boundary current system of southern Greenland |
title_sort |
intensified turbulent mixing in the boundary current system of southern greenland |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/150658/ https://doi.org/10.1029/2007GL032785 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Cape Farewell Denmark Strait Greenland North Atlantic Deep Water North Atlantic |
genre_facet |
Cape Farewell Denmark Strait Greenland North Atlantic Deep Water North Atlantic |
op_relation |
Lauderdale, Jonathan M.; Bacon, Sheldon orcid:0000-0002-2471-9373 Naveira Garabato, Alberto C.; Holliday, N.Penny orcid:0000-0002-9733-8002 . 2008 Intensified turbulent mixing in the boundary current system of southern Greenland. Geophysical Research Letters, 35. L04611. https://doi.org/10.1029/2007GL032785 <https://doi.org/10.1029/2007GL032785> |
op_doi |
https://doi.org/10.1029/2007GL032785 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
4 |
_version_ |
1766387205141430272 |