Annual cycle of turbulent dissipation estimated from Seagliders
The rate of dissipation of turbulent kinetic energy is estimated using Seaglider observations of vertical water velocity in the mid‐latitude North Atlantic. This estimate is based on the large‐eddy method (LEM), allowing the use of measurements of turbulent energy at large scales O(1–10 m) to diagno...
Published in: | Geophysical Research Letters |
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2018
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Online Access: | https://eprints.soton.ac.uk/423803/ https://eprints.soton.ac.uk/423803/1/Evans_et_al_2018_Geophysical_Research_Letters.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:423803 2023-08-27T04:10:52+02:00 Annual cycle of turbulent dissipation estimated from Seagliders Evans, Dafydd Lucas, Natasha Sarah Hemsley, Victoria Frajka‐Williams, Eleanor Naveira Garabato, Alberto C. Martin, Adrian Painter, Stuart C. Inall, Mark Palmer, Matthew 2018-10-01 text https://eprints.soton.ac.uk/423803/ https://eprints.soton.ac.uk/423803/1/Evans_et_al_2018_Geophysical_Research_Letters.pdf en English eng https://eprints.soton.ac.uk/423803/1/Evans_et_al_2018_Geophysical_Research_Letters.pdf Evans, Dafydd, Lucas, Natasha Sarah, Hemsley, Victoria, Frajka‐Williams, Eleanor, Naveira Garabato, Alberto C., Martin, Adrian, Painter, Stuart C., Inall, Mark and Palmer, Matthew (2018) Annual cycle of turbulent dissipation estimated from Seagliders. Geophysical Research Letters. (doi:10.1029/2018GL079966 <http://dx.doi.org/10.1029/2018GL079966>). accepted_manuscript Article PeerReviewed 2018 ftsouthampton https://doi.org/10.1029/2018GL079966 2023-08-03T22:23:21Z The rate of dissipation of turbulent kinetic energy is estimated using Seaglider observations of vertical water velocity in the mid‐latitude North Atlantic. This estimate is based on the large‐eddy method (LEM), allowing the use of measurements of turbulent energy at large scales O(1–10 m) to diagnose the rate of energy dissipated through viscous processes at scales O(1 mm). The Seaglider data considered here was obtained in a region of high stratification (1 × 10 −4 < N < 1 × 10 −2 s −1 ), where previous implementations of this method fail. The LEM is generalized to high‐stratification by high‐pass filtering vertical velocity with a cut‐off dependent on the local buoyancy frequency, producing a year‐long time series of dissipation rate spanning the uppermost 1000 m with sub‐daily resolution. This is compared to the dissipation rate estimated from a moored 600 kHz Acoustic Doppler Current Profiler. The variability of the Seaglider‐based dissipation correlates with one‐dimensional scalings of wind and buoyancy driven mixed‐layer turbulence. Article in Journal/Newspaper North Atlantic University of Southampton: e-Prints Soton Geophysical Research Letters 45 19 10,560 10,569 |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
The rate of dissipation of turbulent kinetic energy is estimated using Seaglider observations of vertical water velocity in the mid‐latitude North Atlantic. This estimate is based on the large‐eddy method (LEM), allowing the use of measurements of turbulent energy at large scales O(1–10 m) to diagnose the rate of energy dissipated through viscous processes at scales O(1 mm). The Seaglider data considered here was obtained in a region of high stratification (1 × 10 −4 < N < 1 × 10 −2 s −1 ), where previous implementations of this method fail. The LEM is generalized to high‐stratification by high‐pass filtering vertical velocity with a cut‐off dependent on the local buoyancy frequency, producing a year‐long time series of dissipation rate spanning the uppermost 1000 m with sub‐daily resolution. This is compared to the dissipation rate estimated from a moored 600 kHz Acoustic Doppler Current Profiler. The variability of the Seaglider‐based dissipation correlates with one‐dimensional scalings of wind and buoyancy driven mixed‐layer turbulence. |
format |
Article in Journal/Newspaper |
author |
Evans, Dafydd Lucas, Natasha Sarah Hemsley, Victoria Frajka‐Williams, Eleanor Naveira Garabato, Alberto C. Martin, Adrian Painter, Stuart C. Inall, Mark Palmer, Matthew |
spellingShingle |
Evans, Dafydd Lucas, Natasha Sarah Hemsley, Victoria Frajka‐Williams, Eleanor Naveira Garabato, Alberto C. Martin, Adrian Painter, Stuart C. Inall, Mark Palmer, Matthew Annual cycle of turbulent dissipation estimated from Seagliders |
author_facet |
Evans, Dafydd Lucas, Natasha Sarah Hemsley, Victoria Frajka‐Williams, Eleanor Naveira Garabato, Alberto C. Martin, Adrian Painter, Stuart C. Inall, Mark Palmer, Matthew |
author_sort |
Evans, Dafydd |
title |
Annual cycle of turbulent dissipation estimated from Seagliders |
title_short |
Annual cycle of turbulent dissipation estimated from Seagliders |
title_full |
Annual cycle of turbulent dissipation estimated from Seagliders |
title_fullStr |
Annual cycle of turbulent dissipation estimated from Seagliders |
title_full_unstemmed |
Annual cycle of turbulent dissipation estimated from Seagliders |
title_sort |
annual cycle of turbulent dissipation estimated from seagliders |
publishDate |
2018 |
url |
https://eprints.soton.ac.uk/423803/ https://eprints.soton.ac.uk/423803/1/Evans_et_al_2018_Geophysical_Research_Letters.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://eprints.soton.ac.uk/423803/1/Evans_et_al_2018_Geophysical_Research_Letters.pdf Evans, Dafydd, Lucas, Natasha Sarah, Hemsley, Victoria, Frajka‐Williams, Eleanor, Naveira Garabato, Alberto C., Martin, Adrian, Painter, Stuart C., Inall, Mark and Palmer, Matthew (2018) Annual cycle of turbulent dissipation estimated from Seagliders. Geophysical Research Letters. (doi:10.1029/2018GL079966 <http://dx.doi.org/10.1029/2018GL079966>). |
op_rights |
accepted_manuscript |
op_doi |
https://doi.org/10.1029/2018GL079966 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
19 |
container_start_page |
10,560 |
op_container_end_page |
10,569 |
_version_ |
1775353246141906944 |