Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea

© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. Double diffusion, she...

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Published in:Journal of Physical Oceanography
Main Authors: Fine, Elizabeth C., MacKinnon, Jennifer A., Alford, Matthew H., Middleton, Leo, Taylor, John R., Mickett, John B., Cole, Sylvia T., Couto, Nicole, Le Boyer, Arnaud, Peacock, Thomas
Format: Article in Journal/Newspaper
Language:unknown
Published: American Meteorological Society 2022
Subjects:
Online Access:https://hdl.handle.net/1912/29006
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spelling ftwhoas:oai:darchive.mblwhoilibrary.org:1912/29006 2023-05-15T14:29:21+02:00 Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea Fine, Elizabeth C. MacKinnon, Jennifer A. Alford, Matthew H. Middleton, Leo Taylor, John R. Mickett, John B. Cole, Sylvia T. Couto, Nicole Le Boyer, Arnaud Peacock, Thomas 2022-02-01 https://hdl.handle.net/1912/29006 unknown American Meteorological Society https://doi.org/10.1175/jpo-d-21-0074.1 Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. (2022). Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), 189–203. https://hdl.handle.net/1912/29006 doi:10.1175/jpo-d-21-0074.1 Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. (2022). Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), 189–203. doi:10.1175/jpo-d-21-0074.1 Arctic Diapycnal mixing Diffusion Fluxes Instability Mixing Turbulence Article 2022 ftwhoas https://doi.org/10.1175/jpo-d-21-0074.1 2022-06-18T22:56:45Z © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), (2022): 189–203, https://doi.org/10.1175/jpo-d-21-0074.1. Pacific Summer Water eddies and intrusions transport heat and salt from boundary regions into the western Arctic basin. Here we examine concurrent effects of lateral stirring and vertical mixing using microstructure data collected within a Pacific Summer Water intrusion with a length scale of ∼20 km. This intrusion was characterized by complex thermohaline structure in which warm Pacific Summer Water interleaved in alternating layers of O(1) m thickness with cooler water, due to lateral stirring and intrusive processes. Along interfaces between warm/salty and cold/freshwater masses, the density ratio was favorable to double-diffusive processes. The rate of dissipation of turbulent kinetic energy (ε) was elevated along the interleaving surfaces, with values up to 3 × 10−8 W kg−1 compared to background ε of less than 10−9 W kg−1. Based on the distribution of ε as a function of density ratio Rρ, we conclude that double-diffusive convection is largely responsible for the elevated ε observed over the survey. The lateral processes that created the layered thermohaline structure resulted in vertical thermohaline gradients susceptible to double-diffusive convection, resulting in upward vertical heat fluxes. Bulk vertical heat fluxes above the intrusion are estimated in the range of 0.2–1 W m−2, with the localized flux above the uppermost warm layer elevated to 2–10 W m−2. Lateral fluxes are much larger, estimated between 1000 and 5000 W m−2, and set an overall decay rate for the intrusion of 1–5 years. This work was supported by ONR ... Article in Journal/Newspaper Arctic Basin Arctic Beaufort Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Alford ENVELOPE(161.617,161.617,-71.917,-71.917) Arctic Boyer ENVELOPE(-116.086,-116.086,58.467,58.467) Pacific Peacock ENVELOPE(169.450,169.450,-72.217,-72.217) Journal of Physical Oceanography 52 2 189 203
institution Open Polar
collection Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
op_collection_id ftwhoas
language unknown
topic Arctic
Diapycnal mixing
Diffusion
Fluxes
Instability
Mixing
Turbulence
spellingShingle Arctic
Diapycnal mixing
Diffusion
Fluxes
Instability
Mixing
Turbulence
Fine, Elizabeth C.
MacKinnon, Jennifer A.
Alford, Matthew H.
Middleton, Leo
Taylor, John R.
Mickett, John B.
Cole, Sylvia T.
Couto, Nicole
Le Boyer, Arnaud
Peacock, Thomas
Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
topic_facet Arctic
Diapycnal mixing
Diffusion
Fluxes
Instability
Mixing
Turbulence
description © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), (2022): 189–203, https://doi.org/10.1175/jpo-d-21-0074.1. Pacific Summer Water eddies and intrusions transport heat and salt from boundary regions into the western Arctic basin. Here we examine concurrent effects of lateral stirring and vertical mixing using microstructure data collected within a Pacific Summer Water intrusion with a length scale of ∼20 km. This intrusion was characterized by complex thermohaline structure in which warm Pacific Summer Water interleaved in alternating layers of O(1) m thickness with cooler water, due to lateral stirring and intrusive processes. Along interfaces between warm/salty and cold/freshwater masses, the density ratio was favorable to double-diffusive processes. The rate of dissipation of turbulent kinetic energy (ε) was elevated along the interleaving surfaces, with values up to 3 × 10−8 W kg−1 compared to background ε of less than 10−9 W kg−1. Based on the distribution of ε as a function of density ratio Rρ, we conclude that double-diffusive convection is largely responsible for the elevated ε observed over the survey. The lateral processes that created the layered thermohaline structure resulted in vertical thermohaline gradients susceptible to double-diffusive convection, resulting in upward vertical heat fluxes. Bulk vertical heat fluxes above the intrusion are estimated in the range of 0.2–1 W m−2, with the localized flux above the uppermost warm layer elevated to 2–10 W m−2. Lateral fluxes are much larger, estimated between 1000 and 5000 W m−2, and set an overall decay rate for the intrusion of 1–5 years. This work was supported by ONR ...
format Article in Journal/Newspaper
author Fine, Elizabeth C.
MacKinnon, Jennifer A.
Alford, Matthew H.
Middleton, Leo
Taylor, John R.
Mickett, John B.
Cole, Sylvia T.
Couto, Nicole
Le Boyer, Arnaud
Peacock, Thomas
author_facet Fine, Elizabeth C.
MacKinnon, Jennifer A.
Alford, Matthew H.
Middleton, Leo
Taylor, John R.
Mickett, John B.
Cole, Sylvia T.
Couto, Nicole
Le Boyer, Arnaud
Peacock, Thomas
author_sort Fine, Elizabeth C.
title Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
title_short Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
title_full Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
title_fullStr Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
title_full_unstemmed Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea
title_sort double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the beaufort sea
publisher American Meteorological Society
publishDate 2022
url https://hdl.handle.net/1912/29006
long_lat ENVELOPE(161.617,161.617,-71.917,-71.917)
ENVELOPE(-116.086,-116.086,58.467,58.467)
ENVELOPE(169.450,169.450,-72.217,-72.217)
geographic Alford
Arctic
Boyer
Pacific
Peacock
geographic_facet Alford
Arctic
Boyer
Pacific
Peacock
genre Arctic Basin
Arctic
Beaufort Sea
genre_facet Arctic Basin
Arctic
Beaufort Sea
op_source Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. (2022). Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), 189–203.
doi:10.1175/jpo-d-21-0074.1
op_relation https://doi.org/10.1175/jpo-d-21-0074.1
Fine, E., MacKinnon, J., Alford, M., Middleton, L., Taylor, J., Mickett, J., Cole, S., Couto, N., Boyer, A., & Peacock, T. (2022). Double diffusion, shear instabilities, and heat impacts of a pacific summer water intrusion in the Beaufort Sea. Journal of Physical Oceanography, 52(2), 189–203.
https://hdl.handle.net/1912/29006
doi:10.1175/jpo-d-21-0074.1
op_doi https://doi.org/10.1175/jpo-d-21-0074.1
container_title Journal of Physical Oceanography
container_volume 52
container_issue 2
container_start_page 189
op_container_end_page 203
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