Scaling of Moored Surface Ocean Turbulence Measurements in the Southeast Pacific Ocean

Miller, Una Kim; Zappa, Christopher J.; Zippel, Seth F.; Farrar, J. Thomas; Weller, Robert A.

doi:10.1029/2022jc018901

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Scaling of Moored Surface Ocean Turbulence Measurements in the Southeast Pacific Ocean

2022
By Miller, Una Kim ; Zappa, Christopher J. ; Zippel, Seth F. ; ...
Source: Journal of Geophysical Research: Oceans, 128(1)

[PDF-3.59 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Miller, Una Kim ; Zappa, Christopher J. ; Zippel, Seth F. ; Farrar, J. Thomas ; Weller, Robert A.

Miller, Una Kim ; Zappa, Christopher J. ; Zippel, Seth F. ; Farrar, J. Thomas ; Weller, Robert A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Estimates of turbulence kinetic energy (TKE) dissipation rate (ε) are key in understanding how heat, gas, and other climate‐relevant properties are transferred across the air‐sea interface and mixed within the ocean. A relatively new method involving moored pulse‐coherent acoustic Doppler current profilers (ADCPs) allows for estimates of ε with concurrent surface flux and wave measurements across an extensive length of time and range of conditions. Here, we present 9 months of moored estimates of ε at a fixed depth of 8.4 m at the Stratus mooring site (20°S, 85°W). We find that turbulence regimes are quantified similarly using the Obukhov length scale and the newer Langmuir stability length scale , suggesting that ocean‐side friction velocity implicitly captures the influence of Langmuir turbulence at this site. This is illustrated by a strong correlation between surface Stokes drift and that is likely facilitated by the steady Southeast trade winds regime. In certain regimes, , where is the von Kármán constant and is instrument depth, and surface buoyancy flux capture our estimates of well, collapsing data points near unity. We find that a newer Langmuir turbulence scaling, based on and , scales ε well at times but is overall less consistent than . Monin‐Obukhov similarity theory (MOST) relationships from prior studies in a variety of aquatic and atmospheric settings largely agree with our data in conditions where convection and wind‐driven current shear are both significant sources of TKE, but diverge in other regimes.
Keywords:

[+]

Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 128(1)
DOI:

https://doi.org/10.1029/2022jc018901
ISSN:

2169-9275;2169-9291;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4320158
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Library
Main Document Checksum:

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urn:sha256:c4cc344d46ef7435a255f733ef98848932b5a9bcd9b432cf7c55ec04ca25c694
Download URL:

https://repository.library.noaa.gov/view/noaa/58268/noaa_58268_DS1.pdf
File Type:

Machine readable version (XML)

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