turnerStabilityClass: Turner stability class

In simulariatools: Simularia Tools for the Analysis of Air Pollution Data

Turner stability class

Description

Computes PGT stability class using Turner method, based on the local wind speed, cloud cover, ceiling height and solar elevation.

Usage

turnerStabilityClass(
  datetime,
  longitude,
  latitude,
  ws,
  cloud_cover,
  ceiling_height
)

Arguments

datetime	datetime object (class POSIXct). Either a single value or a vector
longitude, latitude	geographical coordinates (in degrees) of the point of interest
ws	wind speed at 10 m (in m/s)
cloud_cover	Total cloud cover in the range 1...8
ceiling_height	Ceiling height in metres

Details

If datetime is a vector, an equal length vector for the other input parameters is expected. It is also possible to provide a single value for the other parameters; in that case the value is kept constant along all the deadlines.

Value

A numeric value (or vector) in the range 1 to 6, where 1 = A, 2 = B, ..., 6 = F.

See Also

stabilityClass() which computes stability class with other methods. plotStabilityClass() to produce graphical outputs with stability class.

Examples

# Single value example:
turnerStabilityClass(
    datetime = as.POSIXct("2024-12-01 13:00", tz = "ETC/GMT-1"),
    longitude = 7.12,
    latitude = 45.10,
    ws = 3,
    cloud_cover = 3,
    ceiling_height = 3000
)

# datetime vector with constant values
deadlines <- seq(
    from = as.POSIXct("2024-12-01 00:00"),
    to = as.POSIXct("2024-12-31 23:00"),
    length.out = 24 * 31
)
turnerStabilityClass(
    datetime = deadlines,
    longitude = 7.12,
    latitude = 45.10,
    ws = 3,
    cloud_cover = 3,
    ceiling_height = 3000
)

simulariatools documentation built on Jan. 8, 2026, 1:06 a.m.