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 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
| Dimension short name |
description
|
| TIME |
length of the record from turbulence (fast) data channels
|
| TIME_*** <math>^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>^b</math> |
number of *** channel (sensors)
|
<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.
<math>^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.
Required Variables
| Parameter Name |
Standard Name |
Units of measurement |
dimension
|
| TIME |
time |
CF-Conventions compatible offset<math>^a</math> |
TIME
|
| SHEAR |
sea_water_velocity_shear
(or water_velocity_shear) |
s-1 |
[TIME, N_SHEAR_SENSORS]
|
<math>^a</math> i.e. "Days since YYYY-MM-DDT00:00:00Z"
Highly-recommended Level 1 Variables
| 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
(water_pressure) |
dbar |
TIME <math>^a</math>
|
| TEMP |
sea_water_temperature
(water_temperature) |
degree_Celsius |
[TIME <math>^a</math>, N_T_SENSORS]
|
<math>^a</math> or TIME_SLOW or TIME_CTD
<math>^b</math> or ACC (see Table for optional variables)
<math>^c</math> for profiling instruments
Optional Level 1 Variables
| 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
(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
<math>^b</math> or TIME_SLOW
<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.
return to Dataset requirements for shear probes
go to next: Level 2 data.
