Level 4 data (shear probes)

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

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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)

Variables

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Variable Name	Req.[math]\displaystyle{ ^a }[/math]	Standard Name	Units of measurement	Dimensions
TIME	R	time	CF-Convention[math]\displaystyle{ ^b }[/math]	TIME_SPECTRA
SECTION_NUMBER	R	unique_identifier_for_each_section _of_data_from_timeseries	-	TIME_SPECTRA
PSPD_REL	R	platform_speed_wrt_[sea][math]\displaystyle{ ^c }[/math]_water	m s-1	TIME_SPECTRA
EPSI	R	specific_turbulent_kinetic_energy_dissipation _in_[sea][math]\displaystyle{ ^b }[/math]_water	W kg-1	TIME_SPECTRA, N_SHEAR_SENSORS
EPSI_FINAL	R	specific_turbulent_kinetic_energy_dissipation _in_[sea][math]\displaystyle{ ^c }[/math]_water	W kg-1	TIME_SPECTRA
KMAX	R	maximum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation	cpm	TIME_SPECTRA, N_SHEAR_SENSORS
N_S	R	number_of_spectral_points_used_for_estimating_turbulent_kinetic_energy_dissipation	-	TIME_SPECTRA, N_SHEAR_SENSORS
EPSI_FLAGS	R	dissipation_qc_flags	-	TIME_SPECTRA, N_SHEAR_SENSORS
METHOD	R	method_used_for_estimating_ turbulent_kinetic_energy_dissipation	-	TIME_SPECTRA, N_SHEAR_SENSORS
PRES	HR	[sea][math]\displaystyle{ ^c }[/math]_water_pressure	dbar	TIME_SPECTRA
KVISC	HR	kinematic_viscosity_of_[sea][math]\displaystyle{ ^c }[/math]_water	m2 s-1	TIME_SPECTRA
FOM	HR	figure_of_merit	-	TIME_SPECTRA, N_SHEAR_SENSORS
EPSI_STD	HR	expected_standard_deviation_of_the_ logarithm_of_the_dissipation_estimate	-	TIME_SPECTRA, N_SHEAR_SENSORS
MAD	O	mean_absolute_deviation	-	TIME_SPECTRA, N_SHEAR_SENSORS
VAR_RESOLVED	O	variance_resolved	-	TIME_SPECTRA, N_SHEAR_SENSORS
KMIN	O	minimum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation	cpm	TIME_SPECTRA, N_SHEAR_SENSORS
DESPIKE_FRACTION_SH	O	fraction_of_shear_data_modified_by_despiking_algorithm	-	TIME_SPECTRA, N_SHEAR_SENSORS
DESPIKE_PASS_COUNT_SH	O	number_of_despike_passes_for_shear_probes	-	TIME_SPECTRA, N_SHEAR_SENSORS

[math]\displaystyle{ ^a }[/math]: Code for the requirement of variable, R: Required, HR: Highly recommended, O: Optional
[math]\displaystyle{ ^b }[/math]: Unit and offset need to be compatible with the Climate and Forecast (CF)-convention
[math]\displaystyle{ ^c }[/math]: User can choose between water or sea_water depending on the environment

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Return Dataset requirements for shear probes
go to previous: Level 3 data.