Tb_Gates: Operative Environmental Temperature of an Ectotherm Based on...
In trenchproject/TrenchR: Tools for Microclimate and Biophysical Ecology

Tb_Gates

R Documentation

Operative Environmental Temperature of an Ectotherm Based on Gates (1980)

Description

The function predicts body temperatures (C, operative environmental temperature) of an ectotherm using the approximation in \insertCiteGates1980;textualTrenchR. The functions omits evaporative and metabolic heat loss \insertCiteMitchell1976,Kingsolver1983TrenchR.

Usage

Tb_Gates(
  A,
  D,
  psa_dir,
  psa_ref,
  psa_air,
  psa_g,
  T_g,
  T_a,
  Qabs,
  epsilon,
  H_L,
  ef = 1.3,
  K
)

Arguments

`A`	`numeric` surface area (m²).
`D`	`numeric` characteristic dimension for conduction (meters).
`psa_dir`	`numeric` view factor for the proportion surface area exposed to direct radiation from the sky (or enclosure) (0-1).
`psa_ref`	`numeric` view factor for proportion surface area exposed to reflected radiation from the ground (0-1).
`psa_air`	`numeric` proportion surface area exposed to air (0-1).
`psa_g`	`numeric` proportion surface area in contact with substrate (0-1).
`T_g`	`numeric` ground surface temperature (C).
`T_a`	`numeric` ambient air temperature (C).
`Qabs`	`numeric` Solar radiation absorbed (W).
`epsilon`	`numeric` longwave infrared emissivity of skin (proportion), 0.95 to 1 for most animals \insertCiteGates1980TrenchR.
`H_L`	`numeric` Convective heat transfer coefficient (W m^-2 K^-1).
`ef`	`numeric` enhancement factor used to adjust H_L to field conditions using h_L approximation from \insertCiteMitchell1976;textualTrenchR. Approximated as 1.23 by default, but see \insertCiteMitchell1976;textualTrenchR for relationship.
`K`	`numeric` Thermal conductivity (W K^-1 m^-1), K = 0.5 W K^-1 m^-1 for naked skin, K = 0.15 W K^-1 m^-1for insect cuticle \insertCiteGalushko2005;textualTrenchR; conductivity of the ground is generally greater than that of animal tissues, so animal thermal conductivity is generally the rate limiting step.

Value

numeric operative environmental temperature, T_e (C).

References

\insertAllCited

Other biophysical models: Grashof_number_Gates(), Grashof_number(), Nusselt_from_Grashof(), Nusselt_from_Reynolds(), Nusselt_number(), Prandtl_number(), Qconduction_animal(), Qconduction_substrate(), Qconvection(), Qemitted_thermal_radiation(), Qevaporation(), Qmetabolism_from_mass_temp(), Qmetabolism_from_mass(), Qnet_Gates(), Qradiation_absorbed(), Qthermal_radiation_absorbed(), Reynolds_number(), T_sky(), Tb_CampbellNorman(), Tb_Gates2(), Tb_butterfly(), Tb_grasshopper(), Tb_limpetBH(), Tb_limpet(), Tb_lizard_Fei(), Tb_lizard(), Tb_mussel(), Tb_salamander_humid(), Tb_snail(), Tbed_mussel(), Tsoil(), actual_vapor_pressure(), boundary_layer_resistance(), external_resistance_to_water_vapor_transfer(), free_or_forced_convection(), heat_transfer_coefficient_approximation(), heat_transfer_coefficient_simple(), heat_transfer_coefficient(), saturation_vapor_pressure(), saturation_water_vapor_pressure()

Examples

 Tb_Gates (A       = 0.1, 
           D       = 0.025, 
           psa_dir = 0.6, 
           psa_ref = 0.4, 
           psa_air = 0.5, 
           psa_g   = 0.1, 
           T_g     = 30, 
           T_a     = 37, 
           Qabs    = 2, 
           epsilon = 0.95, 
           H_L     = 10, 
           ef      = 1.23, 
           K       = 0.5)

trenchproject/TrenchR documentation built on Oct. 10, 2023, 10:12 p.m.