Level 4 data (velocity point-measurements)
From Atomix
| Page status: Draft | |
|---|---|
| Author(s): | Cynthia |
| Reviewer(s): | |
| Comment: | |
This will dictate the data required at the final processing level, where we store the estimated dissipation estimates [math]\displaystyle{ \varepsilon }[/math] along with quality metrics.
Only a few attributes for each variable are listed since the page's purpose is to describe the information layout within each NetCDF file. Please refer to the complete list for the additional attributes related to each variable (e.g., units, bounds, cell_methods).
Dimensions
The number of velocity instruments (N_VEL_INSTRUMENT) is here for completeness, but the benchmarks examples will have measurements only from one instrument stored.
| Short name | Standard name | Dimensions | Comments |
|---|---|---|---|
| TIME | time | TIME | Units in Days since 1950-01-01T00:00:00Z, time-centred. Provide "bounds" attribute to designate the variable containing the limits of each segment (see CF-compliant example). |
| N_VEL_COMPONENT | unique_identifier_for_each_velocity_component | N_VEL_COMPONENT | Maximum of 3 for u,v, w (east, north, up) velocities |
| Optional variables [math]\displaystyle{ \ddagger }[/math] | |||
| N_VEL_INSTRUMENT | unique_identifier_for_each_velocity_instrument | N_VEL_INSTRUMENT | Required only if storing multiple synchronized instruments in the same file |
Variables
| Short name | Standard name | Dimensions | Comment |
|---|---|---|---|
| EPSI | specific_turbulent_kinetic_energy_dissipation
_in_water |
TIME, N_VEL_COMPONENT, N_VEL_INSTRUMENT | Dissipation rate of turbulent kinetic energy per unit mass of water [W/kg] estimated from each velocity component. |
| EPSI_FINAL | specific_turbulent_kinetic_energy_dissipation
_in_water |
TIME, N_VEL_INSTRUMENT | Final dissipation rate of turbulent kinetic energy per unit mass of water. Typically the vertical component, unless anisotropy precludes from its use. |
| KVISC | kinematic_viscosity_of_water | [Scalar i.e., 1 value], or TIME, R_DIST | This variable is used for assessing length scales against Kolmogorov length scale |
| Quality-control metrics | |||
| EPSI_FLAGS | specific_turbulent_kinetic_energy_dissipation
_in_water_status_flag |
TIME, N_VEL_COMPONENT, N_VEL_INSTRUMENT | Status boolean flags (0-255, 8-bit) that designates one of 8 reasons for rejecting an estimate. |
| Enter remaining entries once this bridge is crossed | |||
Return to: Level 3 spectra
