Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges
Diapycnal mixing of nutrients from the thermocline to the surface sunlit ocean is thought to be relatively weak in the world's subtropical gyres as energy inputs from winds are generally low. The interaction of internal tides with rough topography enhances diapycnal mixing, yet the role of tida...
Published in: | Global Biogeochemical Cycles |
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2019
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Online Access: | https://pure.uhi.ac.uk/en/publications/50760fe4-f7f2-42be-a952-b3afb17f8105 https://doi.org/10.1029/2019GB006214 https://www.research.ed.ac.uk/portal/en/publications/internal-tides-drive-nutrient-fluxes-into-the-deep-chlorophyll-maximum-over-midocean-ridges(f0204fac-5550-4cb5-adba-66aa2af57556).html https://onlinelibrary.wiley.com/doi/abs/10.1029/2019GB006214 |
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ftuhipublicatio:oai:pure.atira.dk:publications/50760fe4-f7f2-42be-a952-b3afb17f8105 2024-06-23T07:55:08+00:00 Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges Tuerena, Robyn E. Williams, Richard G. Mahaffey, Claire Vic, Clément Green, J. A. Mattias Naveira‐garabato, Alberto Forryan, Alexander Sharples, Jonathan 2019-08-01 https://pure.uhi.ac.uk/en/publications/50760fe4-f7f2-42be-a952-b3afb17f8105 https://doi.org/10.1029/2019GB006214 https://www.research.ed.ac.uk/portal/en/publications/internal-tides-drive-nutrient-fluxes-into-the-deep-chlorophyll-maximum-over-midocean-ridges(f0204fac-5550-4cb5-adba-66aa2af57556).html https://onlinelibrary.wiley.com/doi/abs/10.1029/2019GB006214 eng eng https://pure.uhi.ac.uk/en/publications/50760fe4-f7f2-42be-a952-b3afb17f8105 info:eu-repo/semantics/openAccess Tuerena , R E , Williams , R G , Mahaffey , C , Vic , C , Green , J A M , Naveira‐garabato , A , Forryan , A & Sharples , J 2019 , ' Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges ' , Global Biogeochemical Cycles , vol. 33 , no. 8 , pp. 995-1009 . https://doi.org/10.1029/2019GB006214 7ref2021 article 2019 ftuhipublicatio https://doi.org/10.1029/2019GB006214 2024-05-27T23:56:27Z Diapycnal mixing of nutrients from the thermocline to the surface sunlit ocean is thought to be relatively weak in the world's subtropical gyres as energy inputs from winds are generally low. The interaction of internal tides with rough topography enhances diapycnal mixing, yet the role of tidally induced diapycnal mixing in sustaining nutrient supply to the surface subtropical ocean remains relatively unexplored. During a field campaign in the North Atlantic subtropical gyre, we tested whether tidal interactions with topography enhance diapycnal nitrate fluxes in the upper ocean. We measured an order of magnitude increase in diapycnal nitrate fluxes to the deep chlorophyll maximum (DCM) over the Mid‐Atlantic Ridge compared to the adjacent deep ocean. Internal tides drive this enhancement, with diapycnal nitrate supply to the DCM increasing by a factor of 8 between neap and spring tides. Using a global tidal dissipation database, we find that this spring‐neap enhancement in diapycnal nitrate fluxes is widespread over ridges and seamounts. Mid‐ocean ridges therefore play an important role in sustaining the nutrient supply to the DCM, and these findings may have important implications in a warming global ocean. Article in Journal/Newspaper North Atlantic University of the Highlands and Islands: Research Database of UHI Mid-Atlantic Ridge Global Biogeochemical Cycles 33 8 995 1009 |
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University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
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spellingShingle |
7ref2021 Tuerena, Robyn E. Williams, Richard G. Mahaffey, Claire Vic, Clément Green, J. A. Mattias Naveira‐garabato, Alberto Forryan, Alexander Sharples, Jonathan Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
topic_facet |
7ref2021 |
description |
Diapycnal mixing of nutrients from the thermocline to the surface sunlit ocean is thought to be relatively weak in the world's subtropical gyres as energy inputs from winds are generally low. The interaction of internal tides with rough topography enhances diapycnal mixing, yet the role of tidally induced diapycnal mixing in sustaining nutrient supply to the surface subtropical ocean remains relatively unexplored. During a field campaign in the North Atlantic subtropical gyre, we tested whether tidal interactions with topography enhance diapycnal nitrate fluxes in the upper ocean. We measured an order of magnitude increase in diapycnal nitrate fluxes to the deep chlorophyll maximum (DCM) over the Mid‐Atlantic Ridge compared to the adjacent deep ocean. Internal tides drive this enhancement, with diapycnal nitrate supply to the DCM increasing by a factor of 8 between neap and spring tides. Using a global tidal dissipation database, we find that this spring‐neap enhancement in diapycnal nitrate fluxes is widespread over ridges and seamounts. Mid‐ocean ridges therefore play an important role in sustaining the nutrient supply to the DCM, and these findings may have important implications in a warming global ocean. |
format |
Article in Journal/Newspaper |
author |
Tuerena, Robyn E. Williams, Richard G. Mahaffey, Claire Vic, Clément Green, J. A. Mattias Naveira‐garabato, Alberto Forryan, Alexander Sharples, Jonathan |
author_facet |
Tuerena, Robyn E. Williams, Richard G. Mahaffey, Claire Vic, Clément Green, J. A. Mattias Naveira‐garabato, Alberto Forryan, Alexander Sharples, Jonathan |
author_sort |
Tuerena, Robyn E. |
title |
Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
title_short |
Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
title_full |
Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
title_fullStr |
Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
title_full_unstemmed |
Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges |
title_sort |
internal tides drive nutrient fluxes into the deep chlorophyll maximum over mid‐ocean ridges |
publishDate |
2019 |
url |
https://pure.uhi.ac.uk/en/publications/50760fe4-f7f2-42be-a952-b3afb17f8105 https://doi.org/10.1029/2019GB006214 https://www.research.ed.ac.uk/portal/en/publications/internal-tides-drive-nutrient-fluxes-into-the-deep-chlorophyll-maximum-over-midocean-ridges(f0204fac-5550-4cb5-adba-66aa2af57556).html https://onlinelibrary.wiley.com/doi/abs/10.1029/2019GB006214 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Tuerena , R E , Williams , R G , Mahaffey , C , Vic , C , Green , J A M , Naveira‐garabato , A , Forryan , A & Sharples , J 2019 , ' Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid‐ocean Ridges ' , Global Biogeochemical Cycles , vol. 33 , no. 8 , pp. 995-1009 . https://doi.org/10.1029/2019GB006214 |
op_relation |
https://pure.uhi.ac.uk/en/publications/50760fe4-f7f2-42be-a952-b3afb17f8105 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019GB006214 |
container_title |
Global Biogeochemical Cycles |
container_volume |
33 |
container_issue |
8 |
container_start_page |
995 |
op_container_end_page |
1009 |
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1802647588340498432 |