Ground level solar PAR photon irradiance (measured)
Source:R/example.solar.irrad.data.r
ppfd_LICOR.data.RdDataset containing mean, maximum, minimum and standard deviation values for photosynthetically active radiation expressed as photon irradiance. Values are summaries of 12 consecutive readings acquired once every 5 s. The data set covers 17 consecutive days.
Details
The variables are as follows:
time_EEST POSIXct Local time according to EET coordinates.
UTC POSIXct Local time according to UTC.
ppfd_mean numeric (umol m-2 m-2)
ppfd_min numeric (umol m-2 m-2)
ppfd_max numeric (umol m-2 m-2)
ppfd_sd numeric (umol m-2 m-2)
These data are part of a much larger data set (Aphalo, 2023). Instrument used: LI-COR LI-190 quantum sensor, mounted on permanent tripod at approximately 2 m height. Data collected with a Campbell Scientific CR6 datalogger. Sensor connected through a LI-COR millivolt adaptor (604 ohm). Wavelength sensitivity range of the quantum sensor is 400 nm to 700 nm. Location: Viikki campus of the University of Helsinki. Coordinates: 60.226803 N, 25.019205 E.
References
Aphalo, Pedro J. (2023) High frequency weather data for Viikki, Helsinki, Finland. doi:10.17605/OSF.IO/E4VAU .
Examples
colnames(ppfd_LICOR.data)
#> [1] "UTC" "time_EET" "ppfd_mean" "ppfd_max" "ppfd_min" "ppfd_sd"
nrow(ppfd_LICOR.data)
#> [1] 24479
range(ppfd_LICOR.data$time_EET)
#> [1] "2015-08-22 03:01:00 EEST" "2015-09-08 02:59:00 EEST"
where_measured(ppfd_LICOR.data)
#> # A tibble: 1 × 3
#> lon lat address
#> <dbl> <dbl> <chr>
#> 1 25.0 60.2 Viikki, Helsinki, Finland
how_measured(ppfd_LICOR.data)
#> [1] "Measured with LI-COR LI-190 PAR quantum sensor"
what_measured(ppfd_LICOR.data)
#> [1] "Photosynthetically active radiation, PAR (umol m-2 s-1). One-minute means."
comment(ppfd_LICOR.data)
#> [1] "Small subset of a data set published at https://osf.io/e4vau/ doi:10.17605/OSF.IO/E4VAU."