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Ground level solar PAR photon irradiance, direct and diffuse (measured)

Source: R/example.solar.irrad.data.r
ppfd_BF.data.Rd

Dataset containing mean, maximum, minimum and standard deviation values for total, direct and diffuse 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.

Usage

ppfd_BF.data

Format

A data frame with 24479 rows and 9 variables.

Details

The variables are as follows:

  • time_EEST POSIXct Local time according to EET coordinates.

  • UTC POSIXct Local time according to UTC.

  • ppfd_tot_mean numeric (umol m-2 m-2)

  • ppfd_tot_min numeric (umol m-2 m-2)

  • ppfd_tot_max numeric (umol m-2 m-2)

  • ppfd_tot_sd numeric (umol m-2 m-2)

  • ppfd_diff_mean numeric (umol m-2 m-2)

  • ppfd_diff_min numeric (umol m-2 m-2)

  • ppfd_diff_max numeric (umol m-2 m-2)

  • ppfd_diff_sd numeric (umol m-2 m-2)

These data are part of a much larger data set (Aphalo, 2023). Instrument used: Delta-T BF5 "quantum sensor" , mounted on tripod at approximately 2 m height. Data collected with a Campbell Scientific CR6 datalogger, using analogue outputs from the sensor. Wavelength sensitivity range of the quantum sensor is 400 nm to 700 nm, but response is not proportional to energy quanta across wavelengths. Sensor calibrated in site for sunlight. Location: Viikki campus of the University of Helsinki, Finland. 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 .

https://delta-t.co.uk/ https://www.campbellsci.com/

Examples

colnames(ppfd_BF.data)
#>  [1] "UTC"            "time_EET"       "ppfd_tot_mean"  "ppfd_tot_min"  
#>  [5] "ppfd_tot_max"   "ppfd_tot_sd"    "ppfd_diff_mean" "ppfd_diff_min" 
#>  [9] "ppfd_diff_max"  "ppfd_diff_sd"  
nrow(ppfd_BF.data)
#> [1] 24479
range(ppfd_BF.data$time_EET)
#> [1] "2015-08-22 03:01:00 EEST" "2015-09-08 02:59:00 EEST"
where_measured(ppfd_BF.data)
#> # A tibble: 1 × 3
#>     lon   lat address                  
#>   <dbl> <dbl> <chr>                    
#> 1  25.0  60.2 Viikki, Helsinki, Finland
how_measured(ppfd_BF.data)
#> [1] "Measured with Delta-T BF5 Sunshine Sensor"
what_measured(ppfd_BF.data)
#> [1] "Photosynthetically active radiation, PAR (umol m-2 s-1). One-minute means."
comment(ppfd_BF.data)
#> [1] "Small subset of a data set published at https://osf.io/e4vau/ doi:10.17605/OSF.IO/E4VAU."