期刊
JOURNAL OF FLUID MECHANICS
卷 831, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2017.679
关键词
internal waves; stratified turbulence; turbulent mixing
资金
- Stanford Graduate Fellowship
- ONR [N0001408-1-0904, N00014-16-1-2256]
- LLNL [DE-AC52-07NA27344]
- Division Of Ocean Sciences
- Directorate For Geosciences [1151838] Funding Source: National Science Foundation
Most commonly used models for turbulent mixing in the ocean rely on a background stratification against which turbulence must work to stir the fluid. While this background stratification is typically well defined in idealized numerical models, it is more difficult to capture in observations. Here, a potential discrepancy in ocean mixing estimates due to the chosen calculation of the background stratification is explored using direct numerical simulation data of breaking internal waves on slopes. Two different methods for computing the buoyancy frequency N, one based on a three-dimensionally sorted density field (often used in numerical models) and the other based on locally sorted vertical density profiles (often used in the field), are used to quantify the effect of N on turbulence quantities. It is shown that how N is calculated changes not only the flux Richardson number R-f, which is often used to parameterize turbulent mixing, but also the turbulence activity number or the Gibson number Gi, leading to potential errors in estimates of the mixing efficiency using Gi-based parameterizations.
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