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Ocean turbulence kinetic energy dissipation follows a log-normal distribution, even at large scales. This finding impacts how we model ocean energy budgets and interpret sparse observational data.

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Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Geophysics

Background:

  • Turbulent numerical simulations of the global ocean are crucial for understanding energy dissipation.
  • Traditional theories like Kolmogorov-Yaglom may not apply to large-scale ocean turbulence due to its unique characteristics.

Purpose of the Study:

  • To investigate the distribution of kinetic energy dissipation in the global ocean at large horizontal scales.
  • To assess the applicability of existing turbulence theories to oceanographic phenomena.

Main Methods:

  • Analysis of data from turbulent numerical simulations of the global ocean.
  • Examination of kinetic energy dissipation across various depths, seasons, and regions.
  • Evaluation of different subgrid-scale parameterization schemes.

Main Results:

  • Kinetic energy dissipation exhibits a nearly log-normal distribution, even at horizontal scales of approximately 10 km.
  • This log-normality is robust across different oceanic conditions and simulation schemes.
  • Minor systematic deviations from log-normality were observed with depth and subgrid friction schemes.

Conclusions:

  • The log-normal distribution of energy dissipation suggests localized hotspots dominate energy and enstrophy budgets.
  • Simplified models and sparse observations for inferring global energy budgets must account for this distribution.
  • Findings challenge direct application of 3D homogeneous turbulence theories, favoring quasigeostrophic turbulence models.