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.
Dimensions
| 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)
|
Required Variables
| 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_for_estimating_ turbulent_kinetic_energy_dissipation |
- |
[TIME_SPECTRA, N_SHEAR_SENSORS]
|
[math]\displaystyle{ ^a }[/math] Quality control coding for the final dissipation estimate.
[math]\displaystyle{ ^b }[/math] METHOD=0 for spectral integration, METHOD=1 for fitting to the inertial subrange.
Optional Level 4 Variables
| 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 |
expected_standard_deviation_of_the_ logarithm_of_the_dissipation_estimate |
- |
[TIME_SPECTRA, N_SHEAR_SENSORS]
|
Return Dataset requirements for shear probes
go to previous: Level 3 data.
