Simulate Dew Point Temperature

Source: R/simulate_dewpoint.R

Generates synthetic dew point temperature series for multiple stations using simulated air temperature and relative humidity.

simulate_dewpoint(
  temperature,
  rh,
  min_dewpoint = -5,
  max_dewpoint = 35,
  noise_sd = 0.5,
  seed = NULL
)

Arguments

temperature

data.frame from simulate_temperature()

rh

data.frame from simulate_rh()

min_dewpoint

Numeric. Minimum allowable dew point (°C). Default = -5

max_dewpoint

Numeric. Maximum allowable dew point (°C). Default = 35

noise_sd

Numeric. Stochastic variability in dew point. Default = 0.5

seed

Optional numeric seed.

Value

data.frame containing:

Station

Station name

LON

Longitude

LAT

Latitude

ELEV

Elevation

DATE

Simulation timestamp

Year

Calendar year

Month

Calendar month

Season

Climatological season

Tmean

Mean air temperature (°C)

RH

Relative humidity (%)

DewPoint

Simulated dew point temperature (°C)

Dewpoint_Depression

Tmean − DewPoint

Details

Dew point is physically linked to:

  • air temperature,

  • atmospheric moisture,

  • rainfall regimes,

  • coastal humidity effects,

  • elevation controls.

The simulation uses a Magnus-type approximation for realistic atmospheric thermodynamics.

Examples

stations <- create_stations(
  n = 3,
  seed = 123
)
#> Generating synthetic station network...
#> Generated 3 synthetic stations within bounding box.
#> Deriving climate-aware station attributes...

tindex <- generate_time_index(
  start_date = "2000-01-01",
  end_date = "2005-12-31",
  frequency = "monthly"
)
#> Generated 72 time steps at monthly resolution.

temp <- simulate_temperature(
  stations,
  tindex
)
#> Temperature simulation complete for 3 stations.

rh <- simulate_rh(
  stations,
  tindex
)
#> Relative humidity simulation complete for 3 stations.

dew <- simulate_dewpoint(
  temperature = temp,
  rh = rh
)
#> Dew point simulation complete for 3 stations.

head(dew)
#>     Station       LON      LAT  ELEV       DATE Year Month  Season Avg.Temp
#> 1 Station_1 -2.062112 10.68112 422.5 2000-01-16 2000     1     Dry    27.74
#> 2 Station_1 -2.062112 10.68112 422.5 2000-02-15 2000     2     Dry    27.61
#> 3 Station_1 -2.062112 10.68112 422.5 2000-03-16 2000     3 Pre-Wet    27.72
#> 4 Station_1 -2.062112 10.68112 422.5 2000-04-15 2000     4 Pre-Wet    27.44
#> 5 Station_1 -2.062112 10.68112 422.5 2000-05-16 2000     5 Pre-Wet    27.52
#> 6 Station_1 -2.062112 10.68112 422.5 2000-06-15 2000     6     Wet    25.51
#>      RH DewPoint Dewpoint_Depression
#> 1 51.92    17.19               10.55
#> 2 61.22    19.04                8.57
#> 3 58.69    19.39                8.33
#> 4 60.54    19.38                8.06
#> 5 59.98    19.43                8.09
#> 6 54.83    15.80                9.71