neptoon.corrections.theory

air_humidity_corrections¶

Functions:

humidity_correction_rosolem2013
calc_absolute_humidity
calc_saturation_vapour_pressure
calc_vapour_pressure_from_dewpoint_temp
calc_relative_humidity_from_dewpoint_temperature
calc_actual_vapour_pressure

Functions related neutron corrections for changes to air humidity

Functions in this module:

humidity_correction_rosolem2013
saturation_vapour_pressure
calc_absolute_humidity
calc_vapour_pressure_from_dewpoint_temp
calc_relative_humidity_from_temperature

humidity_correction_rosolem2013 ¶

humidity_correction_rosolem2013(absolute_humidity, reference_absolute_humidity=0)

Calculate the correction factor for neutron counts based on the difference in absolute humidity between current and reference conditions.

Parameters:

Name	Type	Description	Default
`absolute_humidity`	`float`	Current absolute humidity in grams per cubic meter (g/m^3).	required
`reference_absolute_humidity`	`float`	Reference absolute humidity in grams per cubic meter (g/m^3).	`0`

Returns:

Name	Type	Description
`c_humidity`	`float`	Correction factor to be multiplied with neutron counts.

calc_absolute_humidity ¶

calc_absolute_humidity(vapour_pressure, temperature)

Calculate absolute humidity using air temperature and vapour pressure.

Parameters:

Name	Type	Description	Default
`vapour_pressure`	`float`	Vapour pressure in pascals (hPa)	required
`temperature`	`float`	Air temperature in Celsius (C)	required

Returns:

Name	Type	Description
`absolute_humidity`	`float`	Absolute humidity in grams per cubic meter (g/m^3)

calc_saturation_vapour_pressure ¶

calc_saturation_vapour_pressure(temperature)

Calculate saturation vapour pressure (hPA) using average temperature Can be used to calculate actual vapour pressure (hPA) if using dew point temperature

Parameters:

Name	Type	Description	Default
`temperature`	`float`	temperature (C)	required

Returns:

Type	Description
`float`	saturation vapour pressure (hPA)

calc_vapour_pressure_from_dewpoint_temp ¶

calc_vapour_pressure_from_dewpoint_temp(dewpoint_temp)

Calculate vapour pressure from the dewpoint temperature, particularly useful when using ERA5-Land data.

Parameters:

Name	Type	Description	Default
`dewpoint_temp`	`float`	Dewpoint temperature in degrees Celsius (C)	required

Returns:

Name	Type	Description
`vapour_pressure`	`float`	Vapour pressure in hectopascals (hPa).

Example

calc_vapour_pressure_from_dewpoint_temp(12) 1.40

calc_relative_humidity_from_dewpoint_temperature ¶

calc_relative_humidity_from_dewpoint_temperature(temperature, dewpoint_temperature)

Calculate relative humidity from temperature and dewpoint temperature

Parameters:

Name	Type	Description	Default
`temperature`	`float`	Temperature in Celsius (C)	required
`dewpoint_temperature`	`float`	Dewpoint temperature in Celsius (C)	required

Returns:

Name	Type	Description
`relative_humidity`	`float`	Relative humidity (%)

calc_actual_vapour_pressure ¶

calc_actual_vapour_pressure(saturation_vapour_pressure, relative_humidity)

Calculates actual vapour pressure

Parameters:

Name	Type	Description	Default
`saturation_vapour_pressure`	`float`	Saturation Vapour Pressure (hPa)	required
`relative_humidity`	`float`	Relative Humdity (%)	required

Returns:

Type	Description
`actual vapour pressure: float`	The actual vapour pressure (hPa)