Level 1 data (shear probes): Difference between revisions

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Level 1 data refers to the full resolution data in physical units, e.g. the regularly sampled time series of [[Convert the shear probe data|converted shear probe data]]. If needed, a transfer function for shear is given. Below, a table with parameters included in the level 1 data set is compiled. The parameter names and definitions fit the [[NetCDF parameter]] attributes and data is stored as a NetCDF group with the name "L1_converted".
Level 1 data refers to the full resolution data in physical units, e.g. the regularly sampled time series of [[Convert the shear probe data|converted shear probe data]]. If needed, a transfer function for shear is given. Below, a table with parameters included in the level 1 data set is compiled. The data are stored as a NetCDF group with the name "L1_converted".


In the standard names, "sea_water" can be replaced with "water" if working in freshwater environments. This is specified in some entries below but not all.
In the standard names, "sea_water" can be replaced with "water" if working in freshwater environments. This is specified in some entries below but not all.
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{| class="wikitable sortable"
{| class="wikitable sortable"
! Dimension short name !! description
! Dimension !! Description
|-
|-
| TIME || length of the record from turbulence (fast) data channels
| TIME || length of the record from turbulence (fast) data channels
|-
|-
| TIME_*** <math>^a</math> || length of the record from the *** sensor (e.g., CTD or SLOW)  
| TIME_*** <math>^a</math> || length of the record from slow data channels (if different from fast)
|-
|-
|N_SHEAR_SENSORS ||number of shear channel (shear sensors)
|N_SHEAR_SENSORS ||number of shear channels (shear sensors)
|-
|-
|N_***_SENSORS <math>^b</math>  ||number of *** channel (sensors)
|N_***_SENSORS <math>^b</math>  ||number of *** channel (sensors)
|-
|-
|}
|}
<math>^a</math> Typically we assume TIME for the fast-sampled microstructure channels, and for example, _SLOW or _CTD for slower sampled channels such as CTD and tilt sensors. If the application requires different time stamps for different sensors, this can be utilized like TIME_PITCH, TIME_ACC etc.
<math>^a</math> Typically TIME is assumed for the fast-sampled microstructure channels. Use, e.g., TIME_SLOW or TIME_CTD for slower sampled channels such as CTD and tilt sensors. If the application requires different time stamps for different sensors, this can be utilized like TIME_PITCH, TIME_ACC etc.
<br>
<br>
<math>^b</math> Please use these examples for related sensors:<br>
<math>^b</math> Please use these examples for related sensors:<br>
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</div>


=Required Variables=
=Variables=
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{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
! Variable Name !! Req.<math>^a</math> !! Standard Name !! Unit !! Dimensions
|-
|-
| TIME || time || [http://cfconventions.org/cf-conventions/cf-conventions#time-coordinate CF-Conventions compatible offset]<math>^a</math> || TIME  
| TIME || R || time || [http://cfconventions.org/cf-conventions/cf-conventions CF-Convention]<math>^b</math> || TIME  
|-
|-
| SHEAR || sea_water_velocity_shear<br /> (or water_velocity_shear)  || s-1 || [TIME, N_SHEAR_SENSORS]  
| SHEAR || R || [sea]<math>^c</math>_water_velocity_shear || s-1 || TIME, N_SHEAR_SENSORS
|}
<math>^a</math> i.e. "Days since YYYY-MM-DDT00:00:00Z"
</div>
 
 
=Highly-recommended Level 1 Variables=
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<br>
 
{| class="wikitable sortable"
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
|-
| PSPD_REL ||  platform_speed_wrt_sea_water || m s-1 || TIME <math>^a</math>
|-
|-
| VIB<math>^b</math> || platform_vibration || NA || [TIME, N_VIB_SENSORS]
| PSPD_REL || HR||  platform_speed_wrt_[sea]<math>^c</math>_water || m s-1 || TIME
|-
|-
| PRES<math>^c</math> || sea_water_pressure<br /> (water_pressure) || dbar || TIME <math>^a</math>
| VIB || HR || platform_vibration || - || TIME, N_VIB_SENSORS
|-
| TEMP || sea_water_temperature<br /> (water_temperature) || degree_Celsius || [TIME <math>^a</math>, N_T_SENSORS]
|}
<math>^a</math> or TIME_SLOW or TIME_CTD
<br><math>^b</math> or ACC (see Table for optional variables)
<br><math>^c</math> for profiling instruments
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=Optional Level 1 Variables=
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<br>
 
{| class="wikitable sortable"
|-
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
| PRES || HR || [sea]<math>^c</math>_water_pressure|| dbar || TIME
|-
|-
| VIB || platform_vibration || NA || [TIME, N_VIB_SENSORS]
| TEMP || HR || [sea]<math>^c</math>_water_temperature || degree_Celsius || TIME, N_T_SENSORS
|-
|-
| ACC || platform_acceleration || m s-2 || [TIME <math>^b</math>, N_ACC_SENSORS]
| ACC || O || platform_acceleration || m s-2 || TIME, N_ACC_SENSORS
|-
|-
| CNDC || sea_water_electrical_conductivity<br /> (water_electrical_conductivity) || S m-1 || [TIME_CTD <math>^b</math>, N_C_SENSORS]
| CNDC || O || [sea]<math>^c</math>_water_electrical_conductivity || S m-1 || TIME_CTD, N_C_SENSORS
|-
|-
| GRADT || temperature_gradient ||  || [TIME, N_GRADT_SENSORS]
| GRADT || O || derivative_of_[sea]<math>^c</math>_water_temperature_wrt_<math>^{*d}</math>||  degree_Celcius m-1 || TIME, N_GRADT_SENSORS  
|-
|-
| GRADC || conductivity_gradient || || [TIME, N_GRADC_SENSORS]
| GRADC || O || derivative_of_[sea]<math>^c</math>_water_conductivity_wrt_<math>^{*d}</math> || - || TIME, N_GRADC_SENSORS
|-
|-
| PITCH || platform_pitch_angle || degree || TIME <math>^a</math>
| PITCH || O || platform_pitch_angle || degree || TIME
|-
|-
| ROLL || platform_roll_angle || degree || TIME <math>^a</math>
| ROLL || O || platform_roll_angle || degree || TIME
|}
|}
<math>^a</math> or TIME_SLOW or TIME_CTD
<math>^a</math>: Code for the requirement of variable, R: Required, HR: Highly recommended, O: Optional
<br><math>^b</math> or TIME_SLOW
<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
<br><math>^d</math>: wrt_x or wrt_s; spatial derivative. Typically derived from the rate of change of temperature and divided by the profiling speed.
</div>
</div>


Latest revision as of 15:13, 6 June 2024


Level 1 data refers to the full resolution data in physical units, e.g. the regularly sampled time series of converted shear probe data. If needed, a transfer function for shear is given. Below, a table with parameters included in the level 1 data set is compiled. The data are stored as a NetCDF group with the name "L1_converted".

In the standard names, "sea_water" can be replaced with "water" if working in freshwater environments. This is specified in some entries below but not all.


Dimensions


Dimension Description
TIME length of the record from turbulence (fast) data channels
TIME_*** [math]\displaystyle{ ^a }[/math] length of the record from slow data channels (if different from fast)
N_SHEAR_SENSORS number of shear channels (shear sensors)
N_***_SENSORS [math]\displaystyle{ ^b }[/math] number of *** channel (sensors)

[math]\displaystyle{ ^a }[/math] Typically TIME is assumed for the fast-sampled microstructure channels. Use, e.g., TIME_SLOW or TIME_CTD for slower sampled channels such as CTD and tilt sensors. If the application requires different time stamps for different sensors, this can be utilized like TIME_PITCH, TIME_ACC etc.
[math]\displaystyle{ ^b }[/math] Please use these examples for related sensors:
N_VIB_SENSORS for vibration (piezo-acceleration) sensors,
N_ACC_SENSORS for vibration acceleration sensors,
N_GRADT_SENSORS for thermistors,
N_GRADC_SENSORS for microconductivity sensors.

Variables


Variable Name Req.[math]\displaystyle{ ^a }[/math] Standard Name Unit Dimensions
TIME R time CF-Convention[math]\displaystyle{ ^b }[/math] TIME
SHEAR R [sea][math]\displaystyle{ ^c }[/math]_water_velocity_shear s-1 TIME, N_SHEAR_SENSORS
PSPD_REL HR platform_speed_wrt_[sea][math]\displaystyle{ ^c }[/math]_water m s-1 TIME
VIB HR platform_vibration - TIME, N_VIB_SENSORS
PRES HR [sea][math]\displaystyle{ ^c }[/math]_water_pressure dbar TIME
TEMP HR [sea][math]\displaystyle{ ^c }[/math]_water_temperature degree_Celsius TIME, N_T_SENSORS
ACC O platform_acceleration m s-2 TIME, N_ACC_SENSORS
CNDC O [sea][math]\displaystyle{ ^c }[/math]_water_electrical_conductivity S m-1 TIME_CTD, N_C_SENSORS
GRADT O derivative_of_[sea][math]\displaystyle{ ^c }[/math]_water_temperature_wrt_[math]\displaystyle{ ^{*d} }[/math] degree_Celcius m-1 TIME, N_GRADT_SENSORS
GRADC O derivative_of_[sea][math]\displaystyle{ ^c }[/math]_water_conductivity_wrt_[math]\displaystyle{ ^{*d} }[/math] - TIME, N_GRADC_SENSORS
PITCH O platform_pitch_angle degree TIME
ROLL O platform_roll_angle degree TIME

[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
[math]\displaystyle{ ^d }[/math]: wrt_x or wrt_s; spatial derivative. Typically derived from the rate of change of temperature and divided by the profiling speed.


return to Dataset requirements for shear probes
go to next: Level 2 data.

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