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 Collapse
TIME_SPECTRA
length of the record of average times of spectral segments
N_SHEAR_SENSORS
number of shear channels (shear sensors)
Required Variables Collapse
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
platform_speed_wrt_sea_water
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
KMIN
minimum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation
cpm
[TIME_SPECTRA, N_SHEAR_SENSORS]
KMAX
maximum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation
cpm
[TIME_SPECTRA, N_SHEAR_SENSORS]
N_S
number_of_spectral_points_used_for_estimating_turbulent_kinetic_energy_dissipation
-
[TIME_SPECTRA, N_SHEAR_SENSORS]
EPSI_STD
expected_standard_deviation_of_the_ logarithm_of_the_dissipation_estimate
-
[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 Collapse
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]
DESPIKE_FRACTION_SH
fraction_of_shear_data_modified_by_despiking_algorithm
-
[TIME_SPECTRA, N_SHEAR_SENSORS]
DESPIKE_PASS_COUNT_SH
number_of_despike_passes_for_shear_probes
-
[TIME_SPECTRA, N_SHEAR_SENSORS]
Return Dataset requirements for shear probes Level 3 data .
