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

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Dimension short name	description
TIME	length of the record from turbulence (fast) data channels
TIME_*** [math]\displaystyle{ ^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]\displaystyle{ ^b }[/math]	number of *** channel (sensors)

[math]\displaystyle{ ^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]\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

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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

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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

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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.

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