Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics
An advection – diffusion balance was used to calculate the diapycnal vertical mixing between water masses required to maintain the density stratification in the Arctic Ocean. A box model bounded by a velocity field created from hydrographic measurements at the gateways of the Arctic (Bering, Davis a...
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ftsouthampton:oai:eprints.soton.ac.uk:388134 2023-07-30T03:59:37+02:00 Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics DeGiorgio, Romina 2015-12-18 text https://eprints.soton.ac.uk/388134/ https://eprints.soton.ac.uk/388134/1/Degiorgio%252C%2520Romina_MPhil_Feb_16.pdf en English eng https://eprints.soton.ac.uk/388134/1/Degiorgio%252C%2520Romina_MPhil_Feb_16.pdf DeGiorgio, Romina (2015) Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics. University of Southampton, Ocean & Earth Science, Masters Thesis, 72pp. Thesis NonPeerReviewed 2015 ftsouthampton 2023-07-09T22:04:43Z An advection – diffusion balance was used to calculate the diapycnal vertical mixing between water masses required to maintain the density stratification in the Arctic Ocean. A box model bounded by a velocity field created from hydrographic measurements at the gateways of the Arctic (Bering, Davis and Fram Strait and the Barents Sea Opening) was used, and the properties in the interior of the Arctic estimated from a climatology dataset (PHC). The density gradient, volume flux, vertical velocity, diapycnal diffusivity, and dissipation rate were calculated. A weak vertical velocity of 10-7 ms-1 and a weak diapycnal mixing of ~2 x 10-6 m2 s-1 were found in the upper layers of the Arctic up to 200 m depth, likely due to weak turbulent mixing resulting from double diffusion, and consistent with microstructure measurements. An apparent negative diffusivity was found in the bottom layers. This is likely due to the effects of the warm, salty Atlantic Water inflow, of which 3.37 Sv enters the Arctic and is diapycnally transported into its adjacent layers, causing buoyancy loss from down-slope convection and densification of water. Thesis Arctic Arctic Arctic Ocean Barents Sea Fram Strait University of Southampton: e-Prints Soton Arctic Arctic Ocean Barents Sea |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
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English |
description |
An advection – diffusion balance was used to calculate the diapycnal vertical mixing between water masses required to maintain the density stratification in the Arctic Ocean. A box model bounded by a velocity field created from hydrographic measurements at the gateways of the Arctic (Bering, Davis and Fram Strait and the Barents Sea Opening) was used, and the properties in the interior of the Arctic estimated from a climatology dataset (PHC). The density gradient, volume flux, vertical velocity, diapycnal diffusivity, and dissipation rate were calculated. A weak vertical velocity of 10-7 ms-1 and a weak diapycnal mixing of ~2 x 10-6 m2 s-1 were found in the upper layers of the Arctic up to 200 m depth, likely due to weak turbulent mixing resulting from double diffusion, and consistent with microstructure measurements. An apparent negative diffusivity was found in the bottom layers. This is likely due to the effects of the warm, salty Atlantic Water inflow, of which 3.37 Sv enters the Arctic and is diapycnally transported into its adjacent layers, causing buoyancy loss from down-slope convection and densification of water. |
format |
Thesis |
author |
DeGiorgio, Romina |
spellingShingle |
DeGiorgio, Romina Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
author_facet |
DeGiorgio, Romina |
author_sort |
DeGiorgio, Romina |
title |
Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
title_short |
Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
title_full |
Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
title_fullStr |
Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
title_full_unstemmed |
Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics |
title_sort |
mixing in the arctic ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in arctic ocean dynamics |
publishDate |
2015 |
url |
https://eprints.soton.ac.uk/388134/ https://eprints.soton.ac.uk/388134/1/Degiorgio%252C%2520Romina_MPhil_Feb_16.pdf |
geographic |
Arctic Arctic Ocean Barents Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea |
genre |
Arctic Arctic Arctic Ocean Barents Sea Fram Strait |
genre_facet |
Arctic Arctic Arctic Ocean Barents Sea Fram Strait |
op_relation |
https://eprints.soton.ac.uk/388134/1/Degiorgio%252C%2520Romina_MPhil_Feb_16.pdf DeGiorgio, Romina (2015) Mixing in the Arctic Ocean: using the advection-diffusion equation to estimate the role of diapycnal mixing in Arctic Ocean dynamics. University of Southampton, Ocean & Earth Science, Masters Thesis, 72pp. |
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1772810480246587392 |