Individual chamber flux measurements from 14 flux whole-canopy shrub plots sampled near the shrub LTER sites at Toolik Field Station, Alaska, summer 2012.
Variables
YEAR
- Label: YEAR
- Definition: year of measurement
- Type: Date/time
- Date format: YYYY
- Missing values: None specified
Date
- Label: Date
- Definition: Date of Measurement
- Type: Date/time
- Date format: dd-mmm-yy
- Missing values: None specified
SITE
- Label: SITE
- Definition: Toolik
- Type: Nominal
- Missing values: None specified
GROUP
- Label: GROUP
- Definition: Measurement location in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 =Upland | IVO Block 2 =Outlet
- Type: Nominal
- Missing values: None specified
PLOT
- Label: PLOT
- Definition: Individual plot identifier
- Type: Nominal
- Missing values: None specified
TREAT
- Label: TREAT
- Definition: none or fertilised annually (FERT) (with N and P)
- Type: Nominal
- Missing values: None specified
PHASE
- Label: PHASE
- Definition: Measurement series (round of measurements within each year); Not used for this dataset
- Type: Physical quantity
- Unit: number
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
PLOT SIZE
- Label: PLOT SIZE
- Definition: 1m x 1m chamber size
- Type: Nominal
- Missing values: None specified
CURVE ID
- Label: CURVE ID
- Definition: Light curve identifier; Not used for this dataset
- Type: Nominal
- Missing values: None specified
OBSNUM
- Label: OBSNUM
- Definition: Individual flux measurement identifier
- Type: Physical quantity
- Unit: number
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
START TIME
- Label: START TIME
- Definition: 24-hr time of start of light curve
- Type: Date/time
- Date format: HH24:Mi:SS
- Missing values: None specified
LIGHT TREATMENT
- Label: LIGHT TREATMENT
- Definition: Combination of light treatment (shade cloths and diffuser panels) used for flux measurement
- Type: Nominal
- Missing values: None specified
PRESSURE
- Label: PRESSURE
- Definition: average barometric pressure
- Type: Physical quantity
- Unit: kilopascal
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
CH_AIRTEMP
- Label: CH_AIRTEMP
- Definition: average chamber air temperature (degrees Celsius)
- Type: Physical quantity
- Unit: celsius
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
CO2
- Label: CO2
- Definition: average chamber CO2 concentration (umol CO2 per mole air)
- Type: Physical quantity
- Unit: partPerMillion
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
H20
- Label: H20
- Definition: average chamber H2O concentration (mmol H2o per mole air)
- Type: Physical quantity
- Unit: millimolePerMole
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
PAR
- Label: PAR
- Definition: average incident photosynthetic active radiation (umol PAR per meter squared ground per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
PAR RANGE
- Label: PAR RANGE
- Definition: range of incident PAR values recorded during measurement (umol PAR per meter squared ground per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
NDVI
- Label: NDVI
- Definition: normalised difference vegetation index
- Type: Physical quantity
- Unit: dimensionless
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
NEP
- Label: NEP
- Definition: net ecosystem productivity (umol CO2 per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
H2Oflux
- Label: H2Oflux
- Definition: H2O flux (mmol H2O per meter squared per second)
- Type: Physical quantity
- Unit: millimolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
RE
- Label: RE
- Definition: average measured ecosystem respiration (umol CO2 per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
GEP
- Label: GEP
- Definition: gross ecosystem productivity (umol CO2 per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
uncorrected NEP
- Label: uncorrected NEP
- Definition: uncorrected net ecosystem productivity measured with the LiCor 6200 (umol CO2 per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
DIRECT LAI-5cm
- Label: DIRECT LAI-5cm
- Definition: LAI estimate taken under DIRECT light at 5cm from ground (square meter leaf per square meter ground)
- Type: Physical quantity
- Unit: meterSquaredPerMeterSquared
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
DIFFUSE LAI-5cm
- Label: DIFFUSE LAI-5cm
- Definition: LAI estimate taken under DIFFUSE light at 5cm from ground (square meter leaf per square meter ground)
- Type: Physical quantity
- Unit: meterSquaredPerMeterSquared
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
LiCor FILE NAME
- Label: LiCor FILE NAME
- Definition: LiCor data file name of the original data file for each flux measurement (.xlsx format)
- Type: Nominal
- Missing values: None specified
BF3 TOT IRRAD
- Label: BF3 TOT IRRAD
- Definition: Total irradiation measured with DeltaT Beam Fraction sensor (umol PAR per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
BF3 DIFFUSE IRRAD
- Label: BF3 DIFFUSE IRRAD
- Definition: Total diffuse light measured with DeltaT Beam Fraction sensor (umol diffuse light per meter squared per second)
- Type: Physical quantity
- Unit: micromolePerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
DIRECT:DIFFUSE LIGHT FRACTION
- Label: DIRECT:DIFFUSE LIGHT FRACTION
- Definition: Diffuse light divided by total irradiance (umol diffuse light per umol total irradiance)
- Type: Physical quantity
- Unit: dimensionless
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- NaN = Missing or Not Measured
NATURAL LIGHT CONDITION
- Label: NATURAL LIGHT CONDITION
- Definition: Description of the ambient light condition during the flux measurement
- Type: Nominal
- Missing values: None specified
DOM VEG
- Label: DOM VEG
- Definition: Dominant canopy vegetation
- Type: Nominal
- Missing values: None specified
LIGHT CURVE
- Label: LIGHT CURVE
- Definition: Light curve each flux measurement is associated with
- Type: Nominal
- Missing values: None specified
COMMENTS
- Label: COMMENTS
- Definition: Notes on flux and NDVI measurements
- Type: Nominal
- Missing values: None specified