Level 4 data include the final dissipation estimates as time series, as well as indicators for the quality and accuracy of the estimates and additional derived parameters. Each dissipation estimate in level 4 corresponds to a spectrum in the level 3 data. Consequently, the level 3 and 4 TIME dimensions are the same. Parameter EPSI_FINAL is the final dissipation rate estimate, averaged of the selected estimates (using the QC flags) at that depth.
| Dimension short name | description |
|---|---|
| TIME_SPECTRA | length of the record of average times of spectral segments |
| N_SHEAR_SENSORS | number of shear channels (shear sensors) |
| Parameter Name | Standard Name | Units of measurement | dimensions | |
|---|---|---|---|---|
| TIME | time | Days since YYYY-MM-DDT00:00:00Z | TIME_SPECTRA | |
| SECTION_NUMBER | - | TIME_SPECTRA | ||
| PSPD_REL | flow_past_sensor | m s-1 | TIME_SPECTRA | |
| EPSI | specific_turbulent_kinetic_energy_dissipation_in_water | W kg-1 | [TIME_SPECTRA, N_SHEAR_SENSORS] | |
| EPSI_FINAL | specific_turbulent_kinetic_energy_dissipation_in_water | W kg-1 | TIME_SPECTRA | |
| KMAX | maximum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation | cpm | [TIME_SPECTRA, N_SHEAR_SENSORS] | |
| EPSI_FLAGS [math]\displaystyle{ ^a }[/math] | dissipation_qc_flags | - | [TIME_SPECTRA, N_SHEAR_SENSORS] | |
| METHOD [math]\displaystyle{ ^b }[/math] | method used to make dissipation estimate | - | [TIME_SPECTRA, N_SHEAR_SENSORS] |
[math]\displaystyle{ ^a }[/math] Quality control coding for the final dissipation estimate.
[math]\displaystyle{ ^b }[/math] 0 for spectral integration, 1 for fitting to the inertial subrange.
| Parameter Name | Standard Name | Units of measurement | dimension |
|---|---|---|---|
| PRES | water_pressure | dbar | TIME_SPECTRA |
| KVISC | kinematic_viscosity_of_water | m2 s-1 | TIME_SPECTRA |
| FOM | figure_of_merit | - | [TIME_SPECTRA, N_SHEAR_SENSORS] |
| MAD | mean_absolute_deviation | - | [TIME_SPECTRA, N_SHEAR_SENSORS] |
| VAR_RESOLVED | variance_resolved | - | [TIME_SPECTRA, N_SHEAR_SENSORS] |
| KMIN | minimum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation | cpm | [TIME_SPECTRA, N_SHEAR_SENSORS] |
| EPSI_STD | standard_deviation_of_kinetic_ energy_dissipation_estimate | - | [TIME_SPECTRA, N_SHEAR_SENSORS] |
