Velocity point-measurements
Welcome to the velocity point-measurements subgroup!
This subgroup addresses best practices in obtaining turbulent kinetic energy dissipation rate estimates from time series of velocities measured at a point in space. These temporal measurements are converted into spectral observations in the wavenumber (space) domain before being fitted with a model spectrum to obtain turbulent kinetic energy dissipation. Our recommendations are designed for measurements collected by any manufacturer, provided the data quality is sufficient for resolving the turbulence subrange of the velocity spectra.
We will also provide benchmarks for velocity measurements both impacted and unaffected by surface waves. These benchmarks will be a resource for the Ocean Mixing Community to evaluate routines in any programming language.
Scope
The subgroup will provide recommendations and benchmarks for all data processing stages required to obtaining [math]\displaystyle{ \varepsilon }[/math]:
- data processing of raw measurements
- segmenting datasets and decomposing the velocities into the mean, turbulence and surface waves component.
- spectral computations and identifying the appropriate inertial subrange model (e.g., surface wave considerations)
- estimating [math]\displaystyle{ \varepsilon }[/math] and associated quality control measures
These four processing levels coincide with the hierarchal format of the ATOMIX NetCDF velocimeters format for the benchmark datasets. We will not be giving benchmark datasets for moored platforms at this time. However, we will include appropriate references to existing literature.
