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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Online Access: | https://hdl.handle.net/1912/29006 |
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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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1766303387868987392 |