The function estimates solar and thermal radiation (W) absorbed by the surface of an animal following (Gates 1980) and (Spotila et al. 1992) .

Qradiation_absorbed(
  a = 0.9,
  A,
  psa_dir,
  psa_ref,
  S_dir,
  S_dif,
  S_ref = NA,
  a_s = NA
)

Arguments

a

numeric solar absorptivity of animal surface (proportion), default value is for reptiles (0-1).

A

numeric surface area ((m2).

psa_dir

numeric proportion surface area exposed to solar radiation (0-1).

psa_ref

numeric proportion surface area exposed to reflected solar radiation (0-1).

S_dir

numeric direct solar radiation (W m-2).

S_dif

numeric diffuse solar radiation (W m-2).

S_ref

numeric reflected solar radiation (W m-2), either provided or estimated if surface albedo is provided instead

a_s

numeric is surface albedo (proportion), optional (not used) if reflected radiation is provided. Values available in (Gates 1980) Table 8.2.

Value

numeric solar radiation absorbed (W)

References

Gates DM (1980). Biophysical Ecology. Springer-Verlag, New York, NY, USA.

Spotila JR, Feder ME, Burggren WW (1992). “Biophysics of Heat and Mass Transfer.” Environmental Physiology of the Amphibians. https://press.uchicago.edu/ucp/books/book/chicago/E/bo3636401.html.

Examples

  Qradiation_absorbed(a       = 0.9,
                      A       = 1,
                      psa_dir = 0.4,
                      psa_ref = 0.4,
                      S_dir   = 1000,
                      S_dif   = 200,
                      a_s     = 0.5)
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