Transmittance due to ozone — trans

Calculates transmittance due to atmospheric ozone.

Usage

trans_ozone(...)

# Default S3 method
trans_ozone(datetime, lon, lat, ..., ozone_column = ozone_column_default)

# S3 method for class 'weather_station'
trans_ozone(weather_station, ...)

Arguments

...: Additional arguments.
datetime: POSIXlt object, date and time of the observation.
lon: Longitude in decimal degrees.
lat: Latitude in decimal degrees.
ozone_column: Atmospheric ozone as column in cm, default ozone_column_default.
weather_station: A weather_station object.

Value

Transmittance ratio from 0 to 1, unitless.

Details

The transmittance due to ozone is calculated using the formula: $$T_{ozone} = 1 - (0.1611 \cdot x \cdot (1 + 139.48 \cdot x)^{-0.3035} - 0.002715 \cdot x \cdot (1 + 0.044 \cdot x + 0.0003 \cdot x^2)^{-1})$$ where $x$ is the product of the ozone column and the relative optical air mass. This is an Iqbal-style atmospheric transmittance approximation as presented in the Bendix (2004) appendix material cited for the package.

References

Bendix 2004, p. 245.

Examples

# Calculate transmittance due to ozone
trans_ozone(
  datetime = as.POSIXlt("2023-08-06 12:00:00", tz = "UTC"),
  lon = 8.68, lat = 50.77, ozone_column = 0.3
)
#> [1] 0.9843997