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. It is saved in the NetCDF group "L4_dissipation". 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 |
CF-Conventions compatible offset[math]\displaystyle{ ^c }[/math] |
TIME_SPECTRA
|
| SECTION_NUMBER |
unique_identifier_for_each_section _of_data_from_timeseries |
- |
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.
[math]\displaystyle{ ^c }[/math] i.e. "Days since YYYY-MM-DDT00:00:00Z"
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.
