Level 3 data (shear probes): Difference between revisions

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Level 3 data contains the raw (and optionally cleaned) [[Spectrum|spectra]] derived from level 2 time series. Level 3 parameters are defined along a new TIME [[Netcdf dimensions (shear probes)|dimension]], which is the average time of the individual spectral segments. The length of the TIME dimension equals the number of spectral segments. Parameter for the calculation of the spectra, e.g. segment length, are provided in the [[Netcdf meta data (shear probes)|meta data]].
Level 3 data contains the raw (and optionally cleaned) [[Spectrum|spectra]] derived from level 2 time series and is saved in the NetCDF group "L3_spectra". Level 3 parameters are defined along a new TIME [[Netcdf dimensions (shear probes)|dimension]], which is the average time of the individual spectral segments. The length of the TIME dimension equals the number of spectral segments. Parameter for the calculation of the spectra, e.g. segment length, are provided in the [[Netcdf meta data (shear probes)|meta data]].




Revision as of 08:47, 27 September 2022

Level 3 data contains the raw (and optionally cleaned) spectra derived from level 2 time series and is saved in the NetCDF group "L3_spectra". Level 3 parameters are defined along a new TIME dimension, which is the average time of the individual spectral segments. The length of the TIME dimension equals the number of spectral segments. Parameter for the calculation of the spectra, e.g. segment length, are provided in the meta data.


Dimensions


Dimension name description
TIME_SPECTRA length of the record of average times of spectral segments. This also equals time of dissipation estimates.
WAVENUMBER length of the wavenumber array
N_SHEAR_SENSORS number of shear channels (shear sensors)
N_***_SENSORS number of *** channels (such as ACC and VIB)

Required Variables


Parameter Name Standard Name Units of measurement dimension
TIME time CF-Conventions compatible offset[math]\displaystyle{ ^b }[/math] TIME_SPECTRA
SECTION_NUMBER - TIME_SPECTRA
PSPD_REL platform_speed_wrt_sea_water m s-1 TIME_SPECTRA
SH_SPEC shear_probe_by spectrum s-2 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS]
KCYC Cyclic wavenumber cpm [TIME_SPECTRA, WAVENUMBER]
DOF degrees_of_freedom_of_spectrum - 1
SH_SPEC_CLEAN[math]\displaystyle{ ^a }[/math] shear_probe_spectrum_clean s-2 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS]

[math]\displaystyle{ ^a }[/math] SH_SPEC_CLEAN must be included in the file if these spectra were used to compute [math]\displaystyle{ \varepsilon }[/math]

[math]\displaystyle{ ^b }[/math] i.e. "Days since YYYY-MM-DDT00:00:00Z"

Optional Level 3 Variables


Parameter Name Standard Name Units of measurement dimension
PRES water_pressure dbar TIME_SPECTRA
ACC_SPEC acceleration_sensor_spectrum m2 s-4 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS]
VIB_SPEC vibration_sensor_spectrum - [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS]
SH_VIB_SPEC shear_and_vibration_cross-spectral_matrix - [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS]
SH_ACC_SPEC shear_and_acceleration_cross-spectral_matrix - [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]

Return Dataset requirements for shear probes
go to previous: Level 2 data
go to next: Level 4 data.

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