View source for Level 1 data (shear probes)



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".

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=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br>

{| class="wikitable sortable"
! Dimension short name !! description
|-
| 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) 
|-
|N_SHEAR_SENSORS ||number of shear channel (shear 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.
<br>
<math>^b</math> Please use these examples for related sensors:<br>
N_VIB_SENSORS for vibration (piezo-acceleration) sensors, <br>
N_ACC_SENSORS for vibration acceleration sensors, <br>
N_GRADT_SENSORS for thermistors, <br>
N_GRADC_SENSORS for microconductivity sensors. <br>
</div>

=Required Variables=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br>

{| class="wikitable sortable"
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension 
|-
| TIME || time || [http://cfconventions.org/cf-conventions/cf-conventions#time-coordinate CF-Conventions compatible offset]<math>^a</math> || TIME 
|-
| SHEAR || sea_water_velocity_shear<br /> (or 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=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<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] 
|-
| PRES<math>^c</math> || sea_water_pressure<br /> (water_pressure) || dbar || TIME <math>^a</math> 
|-
| 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 
</div>

=Optional Level 1 Variables=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br>

{| class="wikitable sortable"
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension 
|-
| ACC || platform_acceleration || m s-2 || [TIME <math>^b</math>, N_ACC_SENSORS] 
|-
| CNDC || sea_water_electrical_conductivity<br /> (water_electrical_conductivity) || S m-1 || [TIME_CTD <math>^b</math>, N_C_SENSORS] 
|-
| GRADT || derivative_of_seawater_temperature_wrt_z <math>^c</math>||  degree_Celcius m-1 || [TIME, N_GRADT_SENSORS] 
|-
| GRADC || derivative_of_seawater_conductivity_wrt_z <math>^c</math> || Typically not calibrated|| [TIME, N_GRADC_SENSORS]
|-
| PITCH || platform_pitch_angle || degree || TIME <math>^a</math>
|-
| ROLL || platform_roll_angle || degree || TIME <math>^a</math>
|}
<math>^a</math> or TIME_SLOW or TIME_CTD
<br><math>^b</math> or TIME_SLOW
<br><math>^c</math> or wrt_x or wrt_s; spatial derivative. Typically derived from the rate of change of temperature and divided by the profiling speed. 
</div>


------
return to [[Dataset requirements for shear probes]]  <br>
go to next: [[Level 2 data (shear probes)| Level 2 data]].


[[Category: Shear probes]]