Observational evidence of diapycnal upwelling within a sloping submarine canyon
Abstract Small-scale turbulent mixing drives the upwelling of deep water masses in the abyssal ocean as part of the global overturning circulation (Wunsch & Ferrari 2004). However, the processes leading to mixing and the pathways through which this upwelling occurs remain insufficiently understo...
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ftunivbrest:oai:HAL:hal-04299678v1 2024-04-14T08:15:53+00:00 Observational evidence of diapycnal upwelling within a sloping submarine canyon Wynne-Cattanach, Bethan Alford, Matthew Couto, Nicole Drake, Henri Ferrari, Raffaele Boyer, Arnaud Le Mercier, Herle Messias, Marie-Jose Garabato, Alberto Naveira Polzin, Kurt Ruan, Xiaozhou Spingys, Carl van Haren, Hans Voet, Gunnar Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) University College of London London (UCL) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) University of Exeter National Oceanography Centre Southampton (NOC) University of Southampton Woods Hole Oceanographic Institution (WHOI) Royal Netherlands Institute for Sea Research (NIOZ) 2023-11-22 https://hal.science/hal-04299678 https://doi.org/10.21203/rs.3.rs-3459062/v1 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.21203/rs.3.rs-3459062/v1 hal-04299678 https://hal.science/hal-04299678 doi:10.21203/rs.3.rs-3459062/v1 https://hal.science/hal-04299678 2023 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/preprint Preprints, Working Papers, . 2023 ftunivbrest https://doi.org/10.21203/rs.3.rs-3459062/v1 2024-03-21T16:22:40Z Abstract Small-scale turbulent mixing drives the upwelling of deep water masses in the abyssal ocean as part of the global overturning circulation (Wunsch & Ferrari 2004). However, the processes leading to mixing and the pathways through which this upwelling occurs remain insufficiently understood. Recent observational and theoretical work suggests that deep water upwelling may be focused in bottom boundary layers on the ocean’s sloping seafloor; however, direct evidence of this is lacking (Ledwell et al. 2000, St. Laurent et al. 2001, Ferrari et al. 2016, de Lavergne et al. 2016). Here, we present observations from a near-bottom dye release within a canyon on the North Atlantic continental slope showing upwelling across density surfaces at a rate of 250 +/- 75 m/day over three days, ∼10,000 times higher than the global average value required to account for ∼30 Sv of upwelling globally (Munk 1966). The vigourous upwelling is coupled with adiabatic exchange of near-boundary and interior fluid. These results provide direct evidence of strong, bottom-focused diapycnal upwelling in the deep ocean, supporting previous suggestions that mixing at topographic features, such as canyons, leads to upwelling. Report North Atlantic Université de Bretagne Occidentale: HAL Munk ENVELOPE(-95.993,-95.993,55.979,55.979) |
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Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Wynne-Cattanach, Bethan Alford, Matthew Couto, Nicole Drake, Henri Ferrari, Raffaele Boyer, Arnaud Le Mercier, Herle Messias, Marie-Jose Garabato, Alberto Naveira Polzin, Kurt Ruan, Xiaozhou Spingys, Carl van Haren, Hans Voet, Gunnar Observational evidence of diapycnal upwelling within a sloping submarine canyon |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
Abstract Small-scale turbulent mixing drives the upwelling of deep water masses in the abyssal ocean as part of the global overturning circulation (Wunsch & Ferrari 2004). However, the processes leading to mixing and the pathways through which this upwelling occurs remain insufficiently understood. Recent observational and theoretical work suggests that deep water upwelling may be focused in bottom boundary layers on the ocean’s sloping seafloor; however, direct evidence of this is lacking (Ledwell et al. 2000, St. Laurent et al. 2001, Ferrari et al. 2016, de Lavergne et al. 2016). Here, we present observations from a near-bottom dye release within a canyon on the North Atlantic continental slope showing upwelling across density surfaces at a rate of 250 +/- 75 m/day over three days, ∼10,000 times higher than the global average value required to account for ∼30 Sv of upwelling globally (Munk 1966). The vigourous upwelling is coupled with adiabatic exchange of near-boundary and interior fluid. These results provide direct evidence of strong, bottom-focused diapycnal upwelling in the deep ocean, supporting previous suggestions that mixing at topographic features, such as canyons, leads to upwelling. |
author2 |
Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) University College of London London (UCL) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) University of Exeter National Oceanography Centre Southampton (NOC) University of Southampton Woods Hole Oceanographic Institution (WHOI) Royal Netherlands Institute for Sea Research (NIOZ) |
format |
Report |
author |
Wynne-Cattanach, Bethan Alford, Matthew Couto, Nicole Drake, Henri Ferrari, Raffaele Boyer, Arnaud Le Mercier, Herle Messias, Marie-Jose Garabato, Alberto Naveira Polzin, Kurt Ruan, Xiaozhou Spingys, Carl van Haren, Hans Voet, Gunnar |
author_facet |
Wynne-Cattanach, Bethan Alford, Matthew Couto, Nicole Drake, Henri Ferrari, Raffaele Boyer, Arnaud Le Mercier, Herle Messias, Marie-Jose Garabato, Alberto Naveira Polzin, Kurt Ruan, Xiaozhou Spingys, Carl van Haren, Hans Voet, Gunnar |
author_sort |
Wynne-Cattanach, Bethan |
title |
Observational evidence of diapycnal upwelling within a sloping submarine canyon |
title_short |
Observational evidence of diapycnal upwelling within a sloping submarine canyon |
title_full |
Observational evidence of diapycnal upwelling within a sloping submarine canyon |
title_fullStr |
Observational evidence of diapycnal upwelling within a sloping submarine canyon |
title_full_unstemmed |
Observational evidence of diapycnal upwelling within a sloping submarine canyon |
title_sort |
observational evidence of diapycnal upwelling within a sloping submarine canyon |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04299678 https://doi.org/10.21203/rs.3.rs-3459062/v1 |
long_lat |
ENVELOPE(-95.993,-95.993,55.979,55.979) |
geographic |
Munk |
geographic_facet |
Munk |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
https://hal.science/hal-04299678 2023 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.21203/rs.3.rs-3459062/v1 hal-04299678 https://hal.science/hal-04299678 doi:10.21203/rs.3.rs-3459062/v1 |
op_doi |
https://doi.org/10.21203/rs.3.rs-3459062/v1 |
_version_ |
1796314352657104896 |