Level 4 data (shear probes): Difference between revisions

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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. 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 [[Quality_control_coding | QC flags]]) at that depth.
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 [[Quality_control_coding | QC flags]]) at that depth.




=Dimensions=
=Dimensions=
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<br>
<br>
{| class="wikitable sortable"
{| class="wikitable sortable"
! Dimension short name
! Dimension short name !! description
! description
|-
|-
| TIME_SPECTRA
| TIME_SPECTRA || length of the record of average times of spectral segments
| Time axis for the spectral estimates
|-
|-
|N_SHEAR_SENSORS
|N_SHEAR_SENSORS ||number of shear channels (shear sensors)
|number of shear channels
|}
|}
</div>
</div>


=Required Variables=
=Variables=
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<br>   
<br>   
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimensions
! Variable Name !! Req.<math>^a</math> !! Standard Name !! Units of measurement !! Dimensions
|-
|-
| TIME || time || Days since YYYY-MM-DDT00:00:00Z || TIME_SPECTRA  
| TIME || R || time || [http://cfconventions.org/cf-conventions/cf-conventions CF-Convention]<math>^b</math> || TIME_SPECTRA  
|-
|-
| SECTION_NUMBER || || dimensionless || TIME_SPECTRA
| SECTION_NUMBER || R || unique_identifier_for_each_section _of_data_from_timeseries || - || TIME_SPECTRA
|-
|-
| PSPD_REL || flow_past_sensor || m s-1 || TIME_SPECTRA ||
| PSPD_REL || R || platform_speed_wrt_[sea]<math>^c</math>_water || m s-1 || TIME_SPECTRA ||
|-
|-
| EPSI  || specific_turbulent_kinetic_energy_dissipation_in_water || W kg-1 || [TIME_SPECTRA, N_SHEAR_SENSORS]
| EPSI  || R || specific_turbulent_kinetic_energy_dissipation _in_[sea]<math>^b</math>_water || W kg-1 || TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| EPSI_FINAL || specific_turbulent_kinetic_energy_dissipation_in_water || W kg-1 || TIME_SPECTRA
| EPSI_FINAL || R || specific_turbulent_kinetic_energy_dissipation _in_[sea]<math>^c</math>_water || W kg-1 || TIME_SPECTRA
|-
|-
| KMAX || maximum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation || cpm || [TIME_SPECTRA, N_SHEAR_SENSORS]
| KMAX || R || maximum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation || cpm || TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| EPSI_FLAGS <math>^a</math> || dissipation_qc_flags || dimensionaless || [TIME_SPECTRA, N_SHEAR_SENSORS]
| N_S || R || number_of_spectral_points_used_for_estimating_turbulent_kinetic_energy_dissipation || - || TIME_SPECTRA, N_SHEAR_SENSORS
|}
|-
<math>^a</math> Quality control coding for the final dissipation estimate
| EPSI_FLAGS || R || dissipation_qc_flags || - || TIME_SPECTRA, N_SHEAR_SENSORS
</div>
|-
 
| METHOD || R || method_used_for_estimating_ turbulent_kinetic_energy_dissipation || - || TIME_SPECTRA, N_SHEAR_SENSORS
=Optional Level 4 Variables=
|-
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| PRES || HR || [sea]<math>^c</math>_water_pressure || dbar || TIME_SPECTRA
<br>
{| class="wikitable sortable"
|-
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
| KVISC || HR || kinematic_viscosity_of_[sea]<math>^c</math>_water || m2 s-1 || TIME_SPECTRA
|-
|-
| PSPD_REL || platform_speed_wrt_sea_water || m s-1 || TIME_SPECTRA
| FOM || HR || figure_of_merit || - || TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| PRES || water_pressure || dbar || TIME_SPECTRA  
| EPSI_STD || HR || expected_standard_deviation_of_the_ logarithm_of_the_dissipation_estimate || - ||TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| KVISC || kinematic_viscosity_of_water || m2 s-1 || TIME_SPECTRA
| MAD || O || mean_absolute_deviation || - || TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| FOM || figure_of_merit || dimensionless || [TIME_SPECTRA, N_SHEAR_SENSORS]
| VAR_RESOLVED || O || variance_resolved || - || TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| MAD || mean_absolute_deviation || dimensionless ||[TIME_SPECTRA, N_SHEAR_SENSORS]
| KMIN || O || minimum_wavenumber_used_for_estimating_ turbulent_kinetic_energy_dissipation || cpm ||TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| VAR_RESOLVED || variance_resolved || dimensionless ||[TIME_SPECTRA, N_SHEAR_SENSORS]
| DESPIKE_FRACTION_SH || O || fraction_of_shear_data_modified_by_despiking_algorithm || - ||TIME_SPECTRA, N_SHEAR_SENSORS
|-
|-
| EPSI_STD || standard_deviation_of_kinetic_ energy_dissipation_estimate || dimensionless ||[TIME_SPECTRA, N_SHEAR_SENSORS]
| DESPIKE_PASS_COUNT_SH || O || number_of_despike_passes_for_shear_probes || - ||TIME_SPECTRA, N_SHEAR_SENSORS
|}
|}
<math>^a</math>: Code for the requirement of variable, R: Required, HR: Highly recommended, O: Optional
<br><math>^b</math>: Unit and offset need to be compatible with the Climate and Forecast (CF)-convention
<br><math>^c</math>: User can choose between water or sea_water depending on the environment


</div>
</div>


-----
-----
Return [[Dataset requirements for shear probes]].
Return [[Dataset requirements for shear probes]]<br>
 
go to previous: [[Level 3 data (shear probes)| Level 3 data]].
[[Category:Shear probes]]
[[Category:Shear probes]]

Latest revision as of 19:18, 24 May 2024

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)

Variables


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

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

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