surface_df: Surface characteristics
In dKvale/aerscreen: Interface to EPA's air dispersion screening model AERSCREEN

View source: R/surface_df.R

surface_df

R Documentation

Surface characteristics

Description

Create a data frame of AERSCREEN surface characteristics used by MAKEMET.

Usage

surface_df(min_temp_k = 235, max_temp_k = 315, min_wind_speed = 0.5,
  anem_height = 10, surface_profile = 7, climate_profile = 1,
  albedo = as.numeric(NA), bowen = as.numeric(NA),
  z_length = as.numeric(NA))

Arguments

`min_temp_k`	Minimum surface temperature in Kelvin. Defaults to `235`.
`max_temp_k`	Maximum surface temperature in Kelvin. Defaults to `315`.
`min_wind_speed`	Minimum wind speed in units of `m/s`. Requires a value of `0.5` or greater. Defaults to `0.5`.
`anem_height`	Anemometer height in meters. Defaults to `10`.
`surface_profile`	Dominant surface characteristics profile. Accepts integers between [0, 3]. Enter `0` if providing site specific albedo, Bowen ratio and surface roughness. Defaults to `7`. Options: (0) None. User specified characteristics will be used. (1) Water (2) Deciduous forest (3) Coniferous forest (4) Swamp (5) Cultivated land (6) Grassland (7) Urban (8) Desert shrubland
`climate_profile`	Dominant climate moisture profile. Accepts integers between [0, 3]. Enter `0` if providing site specific albedo, Bowen ratio and surface roughness. Defaults to `1`. Options: (0) None. User specified characteristics will be used. (1) Average moisture conditions (2) Wet conditions (3) Dry conditions
`albedo`	Albedo. The average proportion of incident light reflected at noontime. Accepts values between [0, 1]. Ignored by AERSCREEN unless `surface_profile` and `climate_profile` are set to `0`.
`bowen`	Bowen ratio. The average midday ratio of the sensible heat flux (`H`) to the evaporative heat flux (`E`). The greater the value of `H/E` the dryer the conditions. Accepts values between [-10 and 10]. Ignored by AERSCREEN unless `surface_profile` and `climate_profile` are set to `0`.
`z_length`	Surface roughness length. The height at which the mean horizontal wind speed approaches zero. Accepts values between [0.001 and 2]. Ignored by AERSCREEN unless `surface_profile` and `climate_profile` are set to `0`.