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 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]\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.

Required Variables

Parameter Name	Standard Name	Units of measurement	dimension
TIME	time	CF-Conventions compatible offset[math]\displaystyle{ ^a }[/math]	TIME
SHEAR	sea_water_velocity_shear (or water_velocity_shear)	s-1	[TIME, N_SHEAR_SENSORS]

[math]\displaystyle{ ^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]\displaystyle{ ^a }[/math]
VIB[math]\displaystyle{ ^b }[/math]	platform_vibration	NA	[TIME, N_VIB_SENSORS]
PRES[math]\displaystyle{ ^c }[/math]	sea_water_pressure (water_pressure)	dbar	TIME [math]\displaystyle{ ^a }[/math]
TEMP	sea_water_temperature (water_temperature)	degree_Celsius	[TIME [math]\displaystyle{ ^a }[/math], N_T_SENSORS]

[math]\displaystyle{ ^a }[/math] or TIME_SLOW or TIME_CTD
[math]\displaystyle{ ^b }[/math] or ACC (see Table for optional variables)
[math]\displaystyle{ ^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]\displaystyle{ ^b }[/math], N_ACC_SENSORS]
CNDC	sea_water_electrical_conductivity (water_electrical_conductivity)	S m-1	[TIME_CTD [math]\displaystyle{ ^b }[/math], N_C_SENSORS]
GRADT	derivative_of_seawater_temperature_wrt_z [math]\displaystyle{ ^c }[/math]	degree_Celcius m-1	[TIME, N_GRADT_SENSORS]
GRADC	derivative_of_seawater_conductivity_wrt_z [math]\displaystyle{ ^c }[/math]	Typically not calibrated	[TIME, N_GRADC_SENSORS]
PITCH	platform_pitch_angle	degree	TIME [math]\displaystyle{ ^a }[/math]
ROLL	platform_roll_angle	degree	TIME [math]\displaystyle{ ^a }[/math]

[math]\displaystyle{ ^a }[/math] or TIME_SLOW or TIME_CTD
[math]\displaystyle{ ^b }[/math] or TIME_SLOW
[math]\displaystyle{ ^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.