Level 3 data (shear probes): Difference between revisions

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Level 3 data contains the raw and cleaned [[Spectrum|spectra]] derived from level 2 data. 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 cleaned [[Spectrum|spectra]] derived from level 2 data. 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]].
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'''Dimensions'''


{| class="wikitable sortable"
{| class="wikitable sortable"
! Short name
! Standard name
! description
|-
|-
! Parameter Name !!  Standard Name !! Units of measurement !! dimension !! Comment
| TIME
| Days since YYYY-MM-DDT00:00:00Z
| Time axis for the microstructure sampling rate
|-
|-
| FLOWPS || flow_past_sensor || m s-1 || TIME ||
| TIME_CTD
| Days since YYYY-MM-DDT00:00:00Z
| Time axis for the CTD sampling rate.
|-
|-
| PRES ||  water_pressure || dbar || TIME ||
| TIME_***
| Days since YYYY-MM-DDT00:00:00Z
| Time axis for the *** sensor sampling rate
|-
|-
| TIME || time || days since 1950-01-01 00:00:00 UTC || TIME ||
|N_SHEAR_SENSORS
|number of shear channel
|
|-
|-
| TEMP ||  water_temperature || degree_Celsius || TIME ||
|N_***_SENSORS
|number of *** channel
|
|-
|-
| SECTION_NUMBER || || dimensionless || TIME ||
|}
 
 
'''Required Variables'''
{| class="wikitable sortable"
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
|-
| TIME || time || YYYY-MM-DDT00:00:00Z || TIME
|-
| SECTION_NUMBER || || dimensionless || TIME
|-
| SH_SPEC || shear_probe_spectrum || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS]
|-
| KCYC || Cyclic wavenumber || cpm || WAVENUMBER
|}
 
'''Optional Level 1 Variables'''
{| class="wikitable sortable"
|-
|-
| SH_SPEC || shear_probe_spectrum || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS] || from shear probes (dirty)
! Parameter Name !! Standard Name !! Units of measurement !! dimension
|-
|-
| SH_SPEC_CLEAN || shear_probe_spectrum_clean || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS] || cleaned using [[Goodman algorithm]]
| PSPD_REL || platform_speed_wrt_sea_water || m s-1 || TIME
|-
|-
| A_SPEC || acceleration_sensor_spectrum || m2 s-4 cpm-1 || [TIME, WAVENUMBER, N_ACCEL_SENSORS] ||
| PRES || water_pressure || dbar || TIME  
|-
|-
| AP_SPEC || vibration_sensor_spectrum || NA || [TIME, WAVENUMBER, N_VIB_SENSORS] ||
| SH_SPEC_CLEAN || shear_probe_spectrum_clean || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS]  
|-
|-
| SH_A_SPEC ||shear_and_acceleration_cross-spectral_matrix || || [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS] ||
| A_SPEC || acceleration_sensor_spectrum || m2 s-4 cpm-1 || [TIME, WAVENUMBER, N_ACCEL_SENSORS]  
|-
|-
| SH_AP_SPEC || shear_and_vibration_cross-spectral_matrix || || [TIME, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS] ||
| AP_SPEC || vibration_sensor_spectrum || NA || [TIME, WAVENUMBER, N_VIB_SENSORS]  
|-
|-
| KCYC || Cyclic wavenumber || cpm || WAVENUMBER ||
| SH_A_SPEC ||shear_and_acceleration_cross-spectral_matrix || || [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]
|-
|-
| KMAX || maximum_wavenumber || cpm || TIME || maximum wavenumber for integration of shear spectrum
| SH_AP_SPEC || shear_and_vibration_cross-spectral_matrix || || [TIME, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS] 
|}
|}
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Revision as of 10:24, 7 May 2022

Level 3 data (shear probes)

Level 3 data contains the raw and cleaned spectra derived from level 2 data. 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

Short name Standard name description
TIME Days since YYYY-MM-DDT00:00:00Z Time axis for the microstructure sampling rate
TIME_CTD Days since YYYY-MM-DDT00:00:00Z Time axis for the CTD sampling rate.
TIME_*** Days since YYYY-MM-DDT00:00:00Z Time axis for the *** sensor sampling rate
N_SHEAR_SENSORS number of shear channel
N_***_SENSORS number of *** channel


Required Variables

Parameter Name Standard Name Units of measurement dimension
TIME time YYYY-MM-DDT00:00:00Z TIME
SECTION_NUMBER dimensionless TIME
SH_SPEC shear_probe_spectrum s-2 cpm-1 [TIME, WAVENUMBER, N_SHEAR_SENSORS]
KCYC Cyclic wavenumber cpm WAVENUMBER

Optional Level 1 Variables

Parameter Name Standard Name Units of measurement dimension
PSPD_REL platform_speed_wrt_sea_water m s-1 TIME
PRES water_pressure dbar TIME
SH_SPEC_CLEAN shear_probe_spectrum_clean s-2 cpm-1 [TIME, WAVENUMBER, N_SHEAR_SENSORS]
A_SPEC acceleration_sensor_spectrum m2 s-4 cpm-1 [TIME, WAVENUMBER, N_ACCEL_SENSORS]
AP_SPEC vibration_sensor_spectrum NA [TIME, WAVENUMBER, N_VIB_SENSORS]
SH_A_SPEC shear_and_acceleration_cross-spectral_matrix [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]
SH_AP_SPEC shear_and_vibration_cross-spectral_matrix [TIME, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS]

Return Dataset requirements for shear probes.

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