TrenchR (version 1.1.1)

diurnal_temp_variation_sineexp: Hourly Temperature Variation assuming Sine and Exponential Components

Description

The function estimates temperature across hours using a diurnal temperature variation function incorporating sine and exponential components Parton1981TrenchR.

Usage

diurnal_temp_variation_sineexp(
  T_max,
  T_min,
  t,
  t_r,
  t_s,
  alpha = 2.59,
  beta = 1.55,
  gamma = 2.2
)

Value

numeric temperature (C) at a specified hour.

Arguments

T_max, T_min

numeric maximum and minimum daily temperatures (C).

t

numeric time for temperature estimate (hour).

t_r, t_s

numeric times of sunrise and sunset (hour).

alpha

numeric time difference between t_x (time of maximum temperature) and noon (hour).

beta

numeric time difference between t_x and sunrise (hour).

gamma

numeric decay parameter for rate of t change from sunset to t_n (time of minimum temp).

Details

Default alpha, beta, and gamma values are the average of 5 North Carolina sites Wann1985TrenchR.

Other alpha, beta, and gamma parameterizations include values for Denver, Colorado from Parton1981;textualTrenchR:

• 150 cm air temperature: alpha = 1.86, beta = 2.20, gamma = -0.17

• 10 cm air temperature: alpha = 1.52, beta = 2.00, gamma = -0.18

• soil surface temperature: alpha = 0.50, beta = 1.81, gamma = 0.49

• 10cm soil temperature: alpha = 0.45, beta = 2.28, gamma = 1.83

References

See Also

Other microclimate functions: air_temp_profile_neutral(), air_temp_profile_segment(), air_temp_profile(), degree_days(), direct_solar_radiation(), diurnal_radiation_variation(), diurnal_temp_variation_sinesqrt(), diurnal_temp_variation_sine(), monthly_solar_radiation(), partition_solar_radiation(), proportion_diffuse_solar_radiation(), solar_radiation(), surface_roughness(), wind_speed_profile_neutral(), wind_speed_profile_segment()

Examples

  diurnal_temp_variation_sineexp(T_max = 30, 
                                 T_min = 10, 
                                 t     = 11, 
                                 t_r   = 6, 
                                 t_s   = 18, 
                                 alpha = 2.59, 
                                 beta  = 1.55, 
                                 gamma = 2.2)