Data dictionary

The data dictionary describes variable names from the files and how those variables are displayed in SoilFluxPro.

LI-8250 Multiplexer variables

Table A‑1. LI-8250 Multiplexer Measured definitions. The device for these variables will be LI-8250.
Interface variable Units Data file variable Description
DOY   DOY Decimal day of year at start of measurement
Date Time YYYY-MM-DD HH:MM:SS   Combined date and time timestamps
Date YYYYMMDD DATE Timestamp of year-month-day
Time HHMMSS TIME Timestamp of hours-minutes-seconds
Temperature C T_CASE Internal temperature of the multiplexer
Pressure kPa PA Atmospheric pressure
Pressure Temperature C T_PA Atmospheric pressure sensor temperature
Pump Positive Pressure kPa PUMP_POSITIVE_PRESSURE Pressure sensor on the positive pressure side of the sampling pump
Pump Negative Pressure kPa PUMP_NEGATIVE_PRESSURE Pressure sensor on the negative pressure side of the sampling pump
Flow L M-1 FLOW Flow rate through the LI-8250 Multiplexer to the active port.
Pump Time H PUMP_TIME Hours of sampling pump operation
Pump Setpoint   PUMP_SETPOINT Drive setting for the sampling pump
Pump Current A PUMP_CURRENT Current draw by the sampling pump
Subsample Pressure kPa SUB_PRESSURE Ambient to subsample loop pressure differential
Subsample Flow L M-1 SUB_FLOW Flow through the subsample loop
VSO Flow Setpoint1   VSO_FLOW_SETPOINT Setting for the the inlet side of the subsample loop
VSO Pressure Setpoint   VSO_PRESSURE_SETPOINT Setting for the outlet side of the subsample loop
Port n Current A PORTn_CURRENT Current draw through the port number listed
Solenoid Current A SOL_CURRENT Current supplied to valves and VSOs
12 VDC Current A 12VDC_CURRENT Current draw on the 12 VDC power output supply
Voltage V VIN Input voltage to multiplexer
Voltage Out V VOUT Output voltage on the nominal 24 VDC supply
VSO Flow Control Voltage V   Flow control voltage to VSO
VSO Pressure Control Voltage V   Pressure control voltage to VSO
5 VDC Voltage V 5VDC_VOLTAGE 5 V supply voltage
12 VDC Voltage V 12VDC_VOLTAGE 12 V supply voltage
Flow Pressure kPa FLOW_PRESSURE Pressure measurement used to determine flow rate
Subsample Flow Pressure kPa SUB_FLOW_PRESSURE Pressure measurement used to determine subsample flow rate
Latitude ° LATITUDE Latitude reported by GPS
Longitude ° LONGITUDE Longitude reported by GPS
Satellites   SATELLITES Number of satellites
Altitude m ALTITUDE Altitude reported by GPS
Table A‑2. LI-8250 Multiplexer Metadata definitions. The device for these variables will be LI-8250. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Port Label   PORT_LABEL User entered description associated with the port
Port   PORT Port number the observation was made on
Latitude ° LATITUDE Multiplexer latitude in decimal degrees
Longitude ° LONGITUDE Multiplexer longitude in decimal degrees

8250-01 Extension Manifold variables

Table A‑3. 8250-01 Extension Manifold data definitions. The DEVICE for these variables will be 8250-01.
Interface
variable		 Units Data file
variable		 Description
Temperature C T_CASE Internal temperature of the extension manifold
Pump Time H PUMP_TIME Hours of sampling pump operation
Pump Setpoint   PUMP_SETPOINT Drive setting for the sampling pump
Pump Current A PUMP_CURRENT Current draw by the sampling pump
Port n Current A PORTn_CURRENT Current draw through the port number listed
Solenoid Current A SOL_CURRENT Current supplied to valves and VSOs
Voltage V VIN Input voltage to multiplexer
12VDC_VOLTAGE V 12VDC_VOLTAGE 12 V supply voltage
5VDC_VOLTAGE V 5VDC_VOLTAGE 5 V supply voltage
3.3VDC_VOLTAGE V 3.3VDC_VOLTAGE 3.3 V supply voltages
Diagnostic   DIAG_CODE Diagnostic flag bits
Table A‑4. 8250-01 Extension Manifold Metadata definitions. The device for these variables will be 8250-01.. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Port   PORT Port number the observation was made on
Tube Length cm TUBE_LENGTH Volume of extension tubing

8200-01S Smart Chamber variables

Table A‑5. 8200-01S Smart Chamber Measured definitions. The device for these variables will be LI-8200.
Interface
variable		 Units Data file
variable		 Description
DOY   DOY Decimal day of year at start of measurement
Date Time YYYY-MM-DD HH:MM:SS   Combined date and time timestamps
Pressure kPa PA Atmospheric pressure
Pressure Temperature C T_PA Atmospheric pressure sensor temperature
Altitude m ALTITUDE Altitude reported by GPS
Satellites   SATELLITES Number of satellites
Table A‑6. 8200-01S Smart Chamber Measured definitions. The device for these variables will be CHAMBER.
Interface
variable		 Units Data file
variable		 Description
Elapsed Time s   Elapsed time since the chamber has closed
Temperature C TA Chamber air temperature
TS_1 C TS_1 Soil temperature from the thermocouple probe
EC_2 # EC_2 Electrical conductivity from the Stevens HydraProbe in S m-1
SWC_2 m3 m-3 SWC_2 Soil moisture from the Stevens HydraProbe
TS_2 C TS_2 Soil temperature from the Stevens HydraProbe
Table A‑7. 8200-01S Smart Chamber Metadata definitions. The device for these variables will be LI-8200. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Rep   REP Replicate for repeated observations
Remark   REMARK Remark
Label   LABEL Measurement label
Table A‑8. 8200-01S Smart Chamber Metadata definitions. The device for these variables will be CHAMBER. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Collar Height cm COLLAR_HEIGHT Collar height
Area cm2 AREA Soil area
Tube Length cm TUBE_LENGTH Volume of extension tubing
Park   PARK_POSITION Chamber park position
Latitude ° LATITUDE Chamber latitude in decimal degrees
Longitude ° LONGITUDE Chamber longitude in decimal degrees

LI-COR long-term chamber variables

Table A‑9. LI-COR chamber Measured definitions. The device for these variables will be CHAMBER. Depending on configuration, there may be other variables in this group as defined by the user.
Interface
variable		 Units Data file
variable		 Description
Elapsed Time s   Elapsed time since the chamber has closed
Temperature C TA Chamber air temperature
Board Temperature C TB Chamber control board temperature
Voltage V VIN Chamber input voltage
Motor Current A MOTOR_CURRENT Current draw by chamber drive motor
State   STATE Chamber states: 1 = closing, 2 = opening, 3 = parking, 4 = manual move, 5 = closed, 6 = open, 7 = parked, and 8 = unknown
Diagnostic   DIAGNOSTIC Indicates quality of the data and state of the instrument
Table A‑10. LI-COR chamber Metadata definitions. The device for these variables will be CHAMBER. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number or chamber type
Firmware   FIRMWARE Device firmware version
Collar Height cm COLLAR_HEIGHT Collar height
Area cm2 AREA Soil area
Closing Time s CLOSE_TIME Time it took the chamber to close
Tube Length cm TUBE_LENGTH Length of tubing associated with the chamber used to calculate total volume
Park Position ° PARK Chamber park position
Latitude ° LATITUDE Chamber latitude in decimal degrees
Longitude ° LONGITUDE Chamber longitude in decimal degrees

LI-6800 Portable Photosynthesis System and 6800-09 Soil CO2 Flux Chamber variables

Table A‑11. LI-6800 Portable Photosynthesis System and 6800-09 Soil CO2 Flux Chamber Measured definitions. The device for these variables will be LI-6800.
Interface
variable		 Units Data file
variable		 Description
DOY   DOY Decimal day of year at start of measurement
Date Time YYYY-MM-DD HH:MM:SS   Combined date and time timestamps
CO2 μmol mol-1 CO2 Carbon dioxide mole fraction
CO2 Dry μmol mol-1 CO2_DRY Carbon dioxide dry mixing ratio
H2O mmol mol-1 H2O Water vapor mole fraction
Pressure kPa PA Atmospheric pressure
Date YYYYMMDD DATE Timestamp of year-month-day
Time HHMMSS TIME Timestamp of hours-minutes-seconds
Table A‑12. LI-6800 Portable Photosynthesis System and 6800-09 Soil CO2 Flux Chamber Measured definitions. The device for these variables will be CHAMBER.
Interface
variable		 Units Data file
variable		 Description
Elapsed Time s   Elapsed time since the chamber has closed
SWC m3 m-3 SWC Soil moisture from the Stevens HydraProbe
Temperature C TA Chamber air temperature
TS C TS Soil temperature from the Stevens HydraProbe
State   STATE  
Table A‑13. LI-6800 Portable Photosynthesis System and 6800-09 Soil CO2 Flux Chamber Metadata definitions. The device for these variables will be LI-6800. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Label   LABEL Measurement label
Table A‑14. LI-6800 Portable Photosynthesis System and 6800-09 Soil CO2 Flux Chamber Metadata definitions. The device for these variables will be CHAMBER. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Collar Height cm COLLAR_HEIGHT Collar height
Area cm2 AREA Soil area
Tube Length cm TUBE_LENGTH Volume of extension tubing
Park   PARK_POSITION Chamber park position
Latitude ° LATITUDE Chamber latitude in decimal degrees
Longitude ° LONGITUDE Chamber longitude in decimal degrees

LI-870 CO2/H2O Analyzer variables

Table A‑15. LI-870 CO2/H2O Analyzer Measured definitions. The device for these variables will be LI-870.
Interface
variable		 Units Data file
variable		 Description
CO2 μmol mol-1 CO2 Carbon dioxide mole fraction
CO2 Dry μmol mol-1 CO2_DRY Carbon dioxide dry mixing ratio
H2O mmol mol-1 H2O Water vapor mole fraction
Cell Temperature C T_CELL Optical bench temperature
Cell Pressure kPa PA_CELL Pressure in the optical bench
CO2 Absorption   CO2_ABS Absorption by carbon dioxide
H2O Absorption   H2O_ABS Absorption by water vapor
Dewpoint C   Dew point temperature
Voltage V VIN Input voltage to the LI-870
Flow L M-1 FLOW Flow rate through the LI-870
Table A‑16. LI-870 Metadata definitions. The device for these variables will be LI-870. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Tube Length cm TUBE_LENGTH Length of tubing associated with the analyzer used to calculate total volume

LI-78xx Trace Gas Analyzer variables

Table A‑17. LI-78xx Trace Gas Analyzer Measured definitions. The device for these variables will be LI-7810, LI-7815, or LI-7820.
Interface
variable		 Units Data file
variable		 Description
Diagnostic   DIAGNOSTIC Diagnostic value indicating the quality of the data and state of the instrument
CO2 Dry μmol mol-1 CO2_DRY Carbon dioxide dry mixing ratio (LI-7810 and LI-7815 only)
H2O mmol mol-1 H2O Water vapor mole fraction
CH4 Dry nmol mol-1 CH4_DRY Methane dry mixing ratio (LI-7810 only)
N2O Dry nmol mol-1 N2O_DRY Nitrous oxide dry mixing ratio (LI-7820 only)
Cavity Temperature C T_CAVITY Optical cavity temperature
Cavity Pressure kPa PA_CAVITY Optical cavity pressure
Laser Pressure kPa PA_LASER_PHASE Pressure used to control the laser phase
Laser Temperature C T_LASER Temperature of the laser
Residual   RESIDUAL Residual of absorption spectrum fit
Ring Down μs RING_DOWN Ring down time
Enclosure Temperature C T_THERMAL_ENCLOSURE Temperature of the optical cavity enclosure
Phase Error   PHASE_ERROR Error between setpoint and actual laser phase in counts
Shift Temperature C T_LASER_SHIFT Difference between factory set laser temperature and operating laser temperature
Voltage V VIN Input voltage to the LI-78xx
Table A‑18. LI-78xx Metadata definitions. The device for these variables will be LI-7810, LI-7815, or LI-7820. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Tube Length cm TUBE_LENGTH Length of tubing associated with the analyzer used to calculate total volume

LI-8100A Automated Soil CO2 Flux System and LI-8150 Multiplexer variables

Table A‑19. LI-8100A Automated Soil CO2 Flux System Measured definitions. The device for these variables will be LI-8100.
Interface
variable		 Units Data file
variable		 Description
DOY   DOY Decimal day of year at start of measurement
Date YYYY-MM-DD HH:MM:SS   Combined date and time timestamps
Pressure kPa PA Atmospheric pressure
H2O mmol mol-1 H2O Water vapor mole fraction
CO2 μmol mol-1 CO2 Carbon dioxide mole fraction
CO2 Dry μmol mol-1 CO2_DRY Carbon dioxide dry mixing ratio
Cell Temperature C T_CELL Optical bench temperature
RH % RH Relative humidity
Board Temperature C T_BOARD Control board temperature
Voltage V VIN Input voltage to LI-8100A
CO2 Absorption   CO2_ABS Absorption by carbon dioxide
H2O Absorption   H2O_ABS Absorption by water vapor
Hour H HOUR Hour of the day
CO2 Raw   RAWCO2 Raw CO2 signal
CO2 Raw Reference   RAWCO2REF Optical amplitude of CO2 channel
H2O Raw   RAWH2O Raw H2O signal
H2O Raw Reference   RAWH2OREF Optical amplitude of H2O channel
Table A‑20. LI-8150 Multiplexer Measured definitions. The device for these variables will be LI-8150.
Interface
variable		 Units Data file
variable		 Description
Flow L M-1 FLOW Flow rate through the LI-8150 Multiplexer to the active port.
Table A‑21. LI-8100A Automated Soil CO2 Flux System Metadata definitions. The device for these variables will be LI-8100. For a list of Metadata variables common to all devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Serial Number   SERIAL_NUMBER Device serial number
Firmware   FIRMWARE Device firmware version
Tube Length cm TUBE_LENGTH Volume of extension tubing
Comment   COMMENT  
Table A‑22. LI-8150 Multiplexer Metadata definitions. The device for these variables will be LI-8150. For a list of Metadata variables common to all LI-COR devices, see Table A‑23.
Interface
variable		 Units Data file
variable		 Description
Volume cm3 VOLUME Device volume
Port   PORT Port number the observation was made on
Latitude ° LATITUDE Multiplexer latitude in decimal degrees
Longitude ° LONGITUDE Multiplexer longitude in decimal degrees

Metadata variables

Table A‑23. All LI-COR devices share the metadata variables shown below.
Interface
variable		 Units Data file
variable		 Description
Start Time YYYYMMDD
HHMMSS		 TIMESTAMP_START Timestamp at the start of an observation
Total Volume cm3 VOLUME_TOTAL Total volume used in flux calculations
Prepurge s PREPURGE Prepurge length
Observation Length s OBSERVATION Observation length
Post Purge s POST_PURGE Post purge length
Horizontal   HORIZONTAL Numerical value of H from chamber's HVR field
Vertical   VERTICAL Numerical value of V from chamber's HVR field

Flux variables

Table A‑24. Flux variable definitions. The device for these variables will reflect the analyzer used and gas measured.
Interface
variable		 Units Data file
variable		 Description
Deadband s DEADBAND Deadband length
Stop Time s STOP_TIME Length of data used for the flux computation
Replicate   REPLICATE Numerical value of R from the chamber's HVR field
Dilution Source   DILUTION_SOURCE Name of the device that provided the water vapor measurement used for dilution correction (NONE for a dry gas)
Dilution Units   DILUTION_UNIT Units of water vapor measurement (NONE for a dry gas)
Gas   GAS Name of the gas species the flux was computed for
Gas Source   GAS_SOURCE Name of the device that measured the gas for which the flux was computed
Temperature   TEMPERATURE Label of the temperature measurement used in flux calculation
Temperature Source   T_SOURCE Device of temperature measurement used in flux calculation
Table A‑25. Exponential flux calculation variable definitions. The device for these variables will reflect the analyzer used and gas measured. The nmol units vary depending on the units the gas was measured in (e.g., nmol, μmol, or mmol).
Interface
variable		 Units Description
Flux nmol m-2 s-1 Area-based flux of gas species based on exponential fit
Flux nmol kg-1 s-1 Mass-based flux of gas species based on exponential fit
dC/dt nmol mol-1 s-1 Slope used to compute flux
R2   Regression coefficient of fit to accumulation curve
CV   Coefficient of variation for flux calculation
C0 nmol mol-1 Gas concentration at time zero
Cx nmol mol-1 Asymptotic gas concentration
a   Curvature parameter of exponential fit
T0 s Time zero for fitting accumulation curve
SEI   Standard error for the intercept
SES   Standard error for the slope
Table A‑26. Linear flux calculation variable. The device for these variables will reflect the analyzer used and gas measured. The nmol units vary depending on the units the gas was measured in (e.g., nmol, μmol, or mmol).
Interface
variable		 Units Description
Flux nmol m-2 s-1 Area-based flux of gas species based on linear fit
Flux nmol kg-1 s-1 Mass-based flux of gas species based on linear fit
dC/dt nmol mol-1 s-1 Slope used to compute flux
R2   Regression coefficient of fit to accumulation curve
CV   Coefficient of variation for flux calculation
SE   Standard error
SSN   Normalized sum of squares