The following environmental variables were observed at multiple heights in the discovery tree.
Air Temperature/Relative Humidity: Campbell Scientific; HC2S3; Calibration dates unknown; Accuracy Air Temperature +- 0.6 deg C, Relative Humidity between -+3% - 7% depending on temperature and RH, 5-minute average; Heights 1.5m and 56m. Chris Thomas fan aspirated shield.
Dew Point Temperature: Calculation on data logger; deg C.
Vapor Pressure and mean air temperature: Calculation on post processing; mb.
Vapor Pressure at dew point temperature: Calculation on post processing; mb.
Air Temperature: Campbell Scientific; 107; Calibration dates unknown; Accuracy =±0.01°C over measurement range (CR1000), < ±0.5°C over measurement range (CR23X), 5-minute average; Heights 10m, 20m, 30m, 40m. Chris Thomas fan aspirated shield.
Leaf-wetness: Decagon Devices; output range 250 – 1500mV, operating temperature -20 deg C to 60 deg C. No accuracy data given; Heights 1.5m, 10m, 20m, 30m, 40m, 56m, units; mV.
Sonic Wind Speed/Direction: Vaisala, WAS425 (new code WS425); Unknown calibration dates; Accuracy +- 0.135 m/s or 3 % of reading, whichever is greater and +- 2 deg for wind speed over 1 m/s), 5-minute average; Heights 1.5m, 50m.
Instruments were mounted on the north side of the tree, approximately 30cm from the trunk. See field methods description section for a list of instruments deployed.
Dataloggers used: Campbell Scientific Inc,; CR1000, Calibration dates unknown; Accuracy Analog voltage accuracy +- (0.06% of reading + offset) at 0 deg to 40 deg C. Campbell Scientific Inc,; CR23X, Calibration dates unknown; Accuracy Analog voltage accuracy unknown.
The data were checked for erroneous values using automated quality assurance checks. Missing timesteps were added and if gaps were less than 5-minutes, estimated values were added. Duplicate timestamps were identified and the second instance of duplicate row was deleted.
Manual data screening was undertaken using flags created by the GCE toolbox referenced in the processing procedures section. In most cases data records flagged as "Q" (questionable) or "I" (impossible) were replaced with NA values. Any NA value that was introduced into the dataset in the screening process has a corresponding flag value of "R", which stands for removed.