Tb_lizard: Operative Environmental Temperature of a Lizard

In trenchproject/TrenchR: Tools for Microclimate and Biophysical Ecology

Operative Environmental Temperature of a Lizard

Description

The function estimates body temperature (C, operative environmental temperature) of a lizard based on \insertCiteCampbell1998;textualTrenchR. The function was designed for Sceloporus lizards and described in \insertCiteBuckley2008;textualTrenchR.

Usage

Tb_lizard(
  T_a,
  T_g,
  u,
  svl,
  m,
  psi,
  rho_s,
  elev,
  doy,
  sun = TRUE,
  surface = TRUE,
  a_s = 0.9,
  a_l = 0.965,
  epsilon_s = 0.965,
  F_d = 0.8,
  F_r = 0.5,
  F_a = 0.5,
  F_g = 0.5
)

Arguments

T_a	numeric air temperature (C).
T_g	numeric surface temperature (C).
u	numeric wind speed (m s-1).
svl	numeric lizard snout vent length (mm).
m	numeric lizard mass (g); note that it can be estimated as in mass_from_length: 3.55 x 10-5 x length3
psi	numeric solar zenith angle (degrees).
rho_s	numeric surface albedo (proportion). ~ 0.25 for grass, ~ 0.1 for dark soil, > 0.75 for fresh snow \insertCiteCampbell1998TrenchR.
elev	numeric elevation (m).
doy	numeric day of year (1-366).
sun	logical indicates whether lizard is in sun (TRUE) or shade (FALSE).
surface	logical indicates whether lizard is on ground surface (TRUE) or above the surface (FALSE, e.g. in a tree).
a_s	numeric lizard solar absorptivity (proportion), a_s = 0.9 \insertCiteGates1980TrenchR (Table 11.4).
a_l	numeric lizard thermal absorptivity (proportion), a_l = 0.965 \insertCiteBartlett1967TrenchR.
epsilon_s	numeric surface emissivity of lizards (proportion), epsilon_s = 0.965 \insertCiteBartlett1967TrenchR.
F_d	numeric the view factor between the surface of the lizard and diffuse solar radiation (proportion). i.e., the portion of the lizard surface that is exposed to diffuse solar radiation \insertCiteBartlett1967TrenchR.
F_r	numeric the view factor between the surface of the lizard and reflected solar radiation (proportion).
F_a	numeric the view factor between the surface of the lizard and atmospheric radiation (proportion).
F_g	numeric the view factor between the surface of the lizard and ground thermal radiation (proportion).

Details

The proportion of radiation that is direct is determined following \insertCiteSears2011;textualTrenchR.

Boundary conductance uses a factor of 1.4 to account for increased convection \insertCiteMitchell1976TrenchR.

Value

T_e numeric predicted body (operative environmental) temperature (C).

References

\insertAllCited

See Also

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_Gates(), Tb_butterfly(), Tb_grasshopper(), Tb_limpetBH(), Tb_limpet(), Tb_lizard_Fei(), 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_lizard(T_a       = 25, 
            T_g       = 30, 
            u         = 0.1, 
            svl       = 60, 
            m         = 10, 
            psi       = 34, 
            rho_s     = 0.24, 
            elev      = 500, 
            doy       = 200, 
            sun       = TRUE, 
            surface   = TRUE, 
            a_s   = 0.9, 
            a_l   = 0.965, 
            epsilon_s = 0.965, 
            F_d       = 0.8, 
            F_r       = 0.5, 
            F_a       = 0.5, 
            F_g       = 0.5)

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