Comment on “Using an ADCP to Estimate Turbulent Kinetic Energy Dissipation Rate in Sheltered Coastal Waters”
Greene et al. revisit the suggestion that the turbulent kinetic energy dissipation rate could be estimated through a “large-eddy estimate,” employing acoustic measurements of velocity fields associated with the largest energy-containing scales of ocean turbulence. While the large-eddy estimate as or...
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| Published in | Journal of atmospheric and oceanic technology Vol. 34; no. 6; pp. 1387 - 1390 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.06.2017
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| Online Access | Get full text |
| ISSN | 0739-0572 1520-0426 |
| DOI | 10.1175/JTECH-D-16-0091.1 |
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| Abstract | Greene et al. revisit the suggestion that the turbulent kinetic energy dissipation rate could be estimated through a “large-eddy estimate,” employing acoustic measurements of velocity fields associated with the largest energy-containing scales of ocean turbulence. While the large-eddy estimate as originally proposed used vertical velocity and a vertical eddy length scale, Greene et al. chose instead to substitute a horizontal length scale for the latter. This comment argues that combining a horizontal scale for length with a vertical velocity scale produces a large-eddy estimate of the dissipation rate that is accurate only if the
energy-containing
eddies are isotropic, and that this condition is highly unlikely in naturally occurring ocean turbulence, subject as it is to influences of stratification, vertical shear, and/or the presence of horizontal boundaries. The problem is documented using data from a large-eddy simulation of Langmuir supercells. |
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| AbstractList | Greene et al. revisit the suggestion that the turbulent kinetic energy dissipation rate could be estimated through a “large-eddy estimate,” employing acoustic measurements of velocity fields associated with the largest energy-containing scales of ocean turbulence. While the large-eddy estimate as originally proposed used vertical velocity and a vertical eddy length scale, Greene et al. chose instead to substitute a horizontal length scale for the latter. This comment argues that combining a horizontal scale for length with a vertical velocity scale produces a large-eddy estimate of the dissipation rate that is accurate only if the
energy-containing
eddies are isotropic, and that this condition is highly unlikely in naturally occurring ocean turbulence, subject as it is to influences of stratification, vertical shear, and/or the presence of horizontal boundaries. The problem is documented using data from a large-eddy simulation of Langmuir supercells. |
| Author | Gargett, Ann E. |
| Author_xml | – sequence: 1 givenname: Ann E. surname: Gargett fullname: Gargett, Ann E. organization: Institute of Ocean Sciences, Sidney, British Columbia, Canada, and Old Dominion University, Norfolk, Virginia |
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| Cites_doi | 10.1175/JPO-D-13-021.1 10.1357/002224008785837149 10.1175/1520-0485(2001)031<1969:TEOMIT>2.0.CO;2 10.1175/1520-0426(1994)011<1592:OTWAMA>2.0.CO;2 10.1002/qj.200212858307 10.1175/JTECH-D-13-00207.1 10.1080/03091929808203686 10.1175/1520-0426(1999)016<1973:VMOTKE>2.0.CO;2 10.1126/science.1100849 10.1357/002224009791218823 10.1029/96JC00507 10.1017/jfm.2015.225 10.1017/S0022112084001592 10.1017/S0022112006004587 10.1017/S0022112006004575 |
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| Title | Comment on “Using an ADCP to Estimate Turbulent Kinetic Energy Dissipation Rate in Sheltered Coastal Waters” |
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