sufr_weather Module Reference

Procedures to deal with weather. More...

Functions/Subroutines
elemental real(double) function	air_pressure (elev, press0)
	Compute the air pressure for a given elevation and pressure at sea level.
elemental real(double) function	air_density (press, temp)
	Compute the air density for the given temperature and pressure.
elemental real function	air_density_sp (press, temp)
	Compute the air density for the given temperature and pressure, single-precision wrapper for air_density()
elemental integer function	beaufort (speed)
	Derive wind "force" on Beaufort scale from wind speed in m/s.
elemental real(double) function	dew_point (tempc, rh)
	Compute the dew point from the temperature and relative humidity.
elemental real(double) function	water_vapor_saturated_density (tempc)
	Compute the saturated water-vapor density in air for a given temperature.

Detailed Description

Procedures to deal with weather.

Function/Subroutine Documentation

air_density()

elemental real(double) function sufr_weather::air_density	(	real(double), intent(in)	press,
		real(double), intent(in)	temp )

Compute the air density for the given temperature and pressure.

Parameters

press	Pressure (Pa)
temp	Temperature (K)

Return values

air_density

Air density (kg/m^3)

See also

https://en.wikipedia.org/wiki/Density_of_air

Definition at line 63 of file weather.f90.

References air_density(), and sufr_kinds::double.

Referenced by air_density(), air_density_sp(), and sufr_sports::cycling_power().

Here is the call graph for this function:

air_density_sp()

elemental real function sufr_weather::air_density_sp	(	real, intent(in)	press,
		real, intent(in)	temp )

Compute the air density for the given temperature and pressure, single-precision wrapper for air_density()

Parameters

press	Pressure (Pa)
temp	Temperature (K)

Return values

air_density_sp

Air density (kg/m^3)

See also

https://en.wikipedia.org/wiki/Density_of_air

Definition at line 88 of file weather.f90.

References air_density(), and air_density_sp().

Referenced by air_density_sp().

Here is the call graph for this function:

air_pressure()

elemental real(double) function sufr_weather::air_pressure	(	real(double), intent(in)	elev,
		real(double), intent(in), optional	press0 )

Compute the air pressure for a given elevation and pressure at sea level.

Parameters

elev	Elevation w.r.t. sea level (m)
press0	Air pressure at sea level (e.g. mbar)

Return values

air_pressure

Air pressure at the given elevation (same as press0, default: mbar)

See also

https://en.wikipedia.org/wiki/Scale_height

Definition at line 37 of file weather.f90.

References air_pressure(), and sufr_kinds::double.

Referenced by air_pressure().

Here is the call graph for this function:

beaufort()

elemental integer function sufr_weather::beaufort

(

real(double), intent(in)

speed

)

Derive wind "force" on Beaufort scale from wind speed in m/s.

Parameters

speed

Wind speed (m/s)

Return values

wind_speed_2_bft

Wind "force" on the Beaufort scale

See also

https://en.wikipedia.org/wiki/Beaufort_scale#Modern_scale

Definition at line 107 of file weather.f90.

References beaufort(), and sufr_kinds::double.

Referenced by beaufort().

Here is the call graph for this function:

dew_point()

elemental real(double) function sufr_weather::dew_point	(	real(double), intent(in)	tempc,
		real(double), intent(in)	rh )

Compute the dew point from the temperature and relative humidity.

Parameters

tempc	Air temperature (degrees Celsius)
RH	Relative humidity (fraction)

Return values

dew_point

Dew point (degrees Celsius)

See also

https://en.wikipedia.org/wiki/Dew_point

Definition at line 159 of file weather.f90.

References dew_point(), and sufr_kinds::double.

Referenced by dew_point().

Here is the call graph for this function:

water_vapor_saturated_density()

elemental real(double) function sufr_weather::water_vapor_saturated_density

(

real(double), intent(in)

tempc

)

Compute the saturated water-vapor density in air for a given temperature.

Parameters

tempc

Air temperature (degrees Celsius)

Return values

water_vapor_saturated_density

Saturated water-vapor density (g/m^3)

Note

• uses data from https://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/relhum.html#c3:
  • for T= -10 - +60°C.
• drops to 0 below T~-25°C;
• significantly better results than original fit (3rd order polynomial):
  • for T<~-15°C and T>~45°C: by eye;
  • for -10°C < T < 60°C (range original fit -0°C < T < 40°C):
    • typical sigma 0.116 (T=0-40°C) -> 0.030 g/m^3 (T=-10-60°C);
    • max. abs. deviation: 0.168 g/m^3 (T=0-40°C; @T=0°C) -> 0.0445 g/m^3 (T=-10-60°C; @T=25°C)
    • max. rel. deviation: 3.46 % (T=0-40°C; @T=0°C) -> 0.194 % (T=-10-60°C; @T=25°C)

Definition at line 193 of file weather.f90.

References sufr_kinds::double, and water_vapor_saturated_density().

Referenced by water_vapor_saturated_density().

Here is the call graph for this function: