### The data
This dataset is being acquired at the Viikki campus of the University of Helsinki, Helsinki, Finland. (lon = 25.01673 E, lat = 60.2253 N)
The weather station, instrumentation and variables are currently described at [a separate website].
Data are available per year as R's .Rda and as .csv files. The data set has gaps, and the standards of calibration and frequency of checking are lower than for weather stations managed according to WMO standards. The special significance of the data is in its high frequeny (1 min) and the multiple wavebands of sunlight being measured simultaneously. WARNING: Winter time data are suspect, due to lack of air blowers in radiation sensors and consequent possible accumulation of snow.
The preprint ["Anticipatory responses to drought by plants: What are the environmental cues?"] describes some of the methods and makes use of some of the data form this project.
[2022-01-03] Added data for UVA1 and UVA2 irradiances. Slightly adjusted the calibrations for red, far-red, blue, UVA and UVB and PAR irradiances for years 2020 and 2021, using additional spectral data. From 2021 onwards PAR data in column `PAR_umol_CS` should be used in preference to `PAR_umol` as the old LI-COR quantum sensor data is more variable than the data from the new sensor.
[2022-01-15] Added data for rain (mm per minute) in column `rain_mm_min`. Only available starting from **2021-06-09 14:00:00**.