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Ground level irradiance for wavelength bands

Source: R/example.solar.irrad.data.r
four_days_1min.data.Rd

Dataset containing mean values for observed terrestrial radiation for PAR, UV-B, UV-A2, UV-A1, blue, red, and far-red photon irradiances and global radiation energy irradiance. Values are summaries of 12 consecutive readings acquired once every 5 s. The data set covers 4 consecutive days with different cloud conditions.

Usage

four_days_1min.data

Format

A data frame with 24479 rows and 9 variables. variables.

Details

The variables are as follows:

  • time_EEST POSIXct Local time according to EET coordinates.

  • UTC POSIXct Local time according to UTC.

  • solar_time numeric Local solar time (h)

  • sun_elevation numeric Sun elevation above the astronomical horizon (degrees)

  • PAR_umo numeric (umol m-2 m-2)

  • PAR_diff_fr numeric Fraction of total downwelling PAR that is diffuse (/1)

  • global_watt numeric Global radiation (W m-2)

  • red_umol numeric Red () light (umol m-2 m-2)

  • far_red_umol numeric Far red () light (umol m-2 m-2)

  • blue_umol numeric blue light () (umol m-2 m-2)

  • blue_sellaro_umol numeric blue light () (umol m-2 m-2)

  • UVA_umol numeric UV-A radiation (315-400 nm) (umol m-2 m-2)

  • UVA1_umol numeric UV-A1 radiation (340-400 nm) (umol m-2 m-2)

  • UVA2_umol numeric UV-A2 radiation (315-340 nm) (umol m-2 m-2)

  • UVB_umol numeric UV-B radiation (280-315 nm) (umol m-2 m-2)

  • solar_disk factor Estimate of whether the solar disk was visible or occluded (visible, occluded)

These data are part of a much larger data set (Aphalo, 2023). height. Data collected with a Campbell Scientific CR6 datalogger, using analogue outputs from the sensors. Location: Viikki campus of the University of Helsinki. Coordinates: 60.226803 N, 25.019205 E. Same data were plotted in Fig. 1 of Sellaro et al. (2024).

References

Aphalo, Pedro J. (2023) High frequency weather data for Viikki, Helsinki, Finland. doi:10.17605/OSF.IO/E4VAU .

Sellaro, Romina; Durand, Maaxime; Aphalo, Pedro J., Casal, Jorge J. (2024) Making the most of canopy light: shade avoidance under a fluctuating spectrum and irradiance. Journal of Experimental Botany, erae334. doi:10.1093/jxb/erae334 .

Examples

colnames(four_days_1min.data)
#>  [1] "solar_time"        "sun_elevation"     "PAR_umol"         
#>  [4] "PAR_diff_fr"       "global_watt"       "red_umol"         
#>  [7] "far_red_umol"      "blue_umol"         "blue_sellaro_umol"
#> [10] "UVA_umol"          "UVA1_umol"         "UVA2_umol"        
#> [13] "UVB_umol"          "was_sunny"         "was_day"          
#> [16] "UTC"               "time_EET"         
nrow(four_days_1min.data)
#> [1] 5760
range(four_days_1min.data$time_EET)
#> [1] "2023-07-09 03:00:00 EEST" "2023-07-13 02:59:00 EEST"
where_measured(four_days_1min.data)
#> # A tibble: 1 × 3
#>     lon   lat address                  
#>   <dbl> <dbl> <chr>                    
#> 1  25.0  60.2 Viikki, Helsinki, Finland
how_measured(four_days_1min.data)
#> [1] "Measured with broad-band sensors."
what_measured(four_days_1min.data)
#> [1] "Photon irradiance for different wavebands measured with broadband sensors. One-minute means."
comment(four_days_1min.data)
#> [1] "Small subset of a data set published at https://osf.io/e4vau/ doi:10.17605/OSF.IO/E4VAU."