Comparison of Thermal Variance Dissipation Rates from Moored and Profiling Instruments at the Equator
Open accessAbstract
As a quantitative test of moored mixing measurements using χpods, a comparison experiment was conducted at 0°, 140°W in October–November 2008. The following three measurement elements were involved: (i) NOAA’s Tropical Atmosphere Ocean (TAO) mooring with five χpods, (ii) a similar mooring 9 km away with seven χpods, and (iii) Chameleon turbulence profiles at an intermediate location. Dissipation rates of temperature variance and turbulent kinetic energy are compared. In all but 3 of 17 direct comparisons 15-day mean values of χT agreed within 95% bootstrap confidence limits computed with the conservative assumption that individual 1-min χpod averages and individual Chameleon profiles are independent. However, significant mean differences occur on 2-day averages. Averaging in time reduces the range (95%) in the observed differences at two locations from a factor of 17 at 1-day averaging time to less than a factor of 2 at 15 days, presumably reflecting the natural variability in both the turbulence and the small-scale fluid dynamics that lead to instability and turbulence. The motion of χpod on a mooring beneath a surface buoy is complex and requires a complete motion package to define in detail. However, perfect knowledge of the motion of the sensor tip is not necessary to obtain a reasonable measure of χT. A sampling test indicated that the most important motion sensor is a pressure sensor sampled rapidly enough to resolve the surface wave–induced motion.
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Confidence in these measurements is justified by previous comparisons between 16-day averages of ε from shipboard profiling (using shear probes) and multiple χpods on both the TAO mooring and an additional nearby mooring that showed agreement to within a factor of 2.
“Confidence in these measurements is justified by previous comparisons between 16-day averages of ϵ from (i) shipboard profiling (using shear probes) and (ii) multiple χpods on both the TAO mooring and an additional nearby mooring that showed agreement to within a factor of 2 (Perlin & Moum, 2012).”
From Deep Cycle Turbulence in Atlantic and Pacific Cold Tongues (2022) · cites this paper as Perlin & Moum, 2012
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Research works printed but not linked: 3
- --, R.-C. Lien, A. Perlin, J. D. Nash, M. C. Gregg, and P. J. Wiles, 2009: Sea surface cooling at the equator by subsurface mix- ing in tropical instability waves. Nat. Geosci., 2, 761-765, doi:10.1038/NGEO657. · DOI · Paper page
- Walchko, K. J., 2002: Low cost inertial navigation: Learning to integrate noise and find your way. M.S. thesis, Dept. of Electrical and Computer Engineering, University of Florida, 80 pp. [Available online at http://www.mil.ufl.edu/publica- tions/thes_diss/Kevin_Walchko_thesis.pdf.
- Wiles, P. J., T. P. Rippeth, J. H. Simpson, and P. J. Hendricks, 2006: A novel technique for measuring the rate of turbulence dis- sipation in the marine environment. Geophys. Res. Let., 33, L21608, doi:10.1029/2006GL027050. · DOI
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Deep Cycle Turbulence in Atlantic and Pacific Cold Tongues
Moum, J. N., Hughes, K. G., Shroyer, E. L., Smyth, W. D., Cherian, D., Warner, S. J., Bourlès, B., Brandt, P., & Dengler, M. (2022) · Geophysical Research Letters · doi:10.1029/2021gl097345 · Cited by 34 · see citing works
“Moored turbulence measurements using χpods (Moum & Nash, 2009) have time resolution sufficient to resolve property (2) and now also extend over many years at a few sites.”
MethodInfluentialSelf-citation
- Authors
- Perlin, A., & Moum, J. N.
- Affiliations
- Oregon State University (US)
- Corresponding author
- Perlin, A.
- ORCID
- Moum, J. N.
- Venue
- Journal of Atmospheric and Oceanic Technology
- Publisher
- American Meteorological Society
- Published
- 2012-09-01
- Volume
- 29
- Issue
- 9
- Pages
- 1347-1362
- ISSN
- 0739-0572 (ISSN-L)
- 1520-0426
- OpenAlex
- W2132297963
- Cited by
- 47
- References
- 0
- Citations by year
- 2025: 1 · 2024: 2 · 2023: 3 · 2022: 5 · 2021: 5 · 2020: 4 · 2019: 5 · 2018: 1 · 2017: 7 · 2016: 7 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 1
- FWCI
- 1.66
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Atmospheric and Oceanic Technology (publishedVersion)
- Funders
- National Science Foundation (0728375)
- University of Washington
- National Oceanic and Atmospheric Administration
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Engineering › Computational Mechanics › Fluid Dynamics and Turbulent Flows
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Ocean Waves and Remote Sensing
- Keywords
- turbulent kinetic energy dissipation, equatorial ocean, sensor motion
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