Converting Humidity Measures into Each Other
Converting dew point (of water in air) into vapor pressure or relative humidity and vice versa.
hr(T, Td, warn = TRUE) pw(Td, warn = TRUE) pw.ai(Td, warn = TRUE) pw.aw(Td, warn = TRUE) Td(pw = NULL, T = NULL, hr = NULL, warn = TRUE) Td.aw(pw = NULL, T = NULL, hr = NULL, warn = TRUE) Tf.ai(pw = NULL, T = NULL, hr = NULL, warn = TRUE)
hr |
Relative humidity in [\textnormal{\%}]. |
T |
Temperature of air in [^\circ \textnormal{C}]. |
Td |
Dew point of air in [^\circ \textnormal{C}]. |
pw |
Saturation vapour pressure in [\textnormal{hPa}]. |
warn |
When |
All vapour pressures correspond to pure water vapour and are not adjusted to water vapour in air.
hr transforms dew point above ice / water at a certain temperature into
relative humidity (-65^\circ\textnormal{C} <= T <=
60^\circ\textnormal{C}).pw transforms dew point into saturation vapour pressure above ice
(-65^\circ\textnormal{C} <= T <=
0^\circ\textnormal{C}) and above water (0^\circ\textnormal{C} < T <=
60^\circ\textnormal{C}) respectively.pw.ai transforms dew point into saturation vapour
pressure above ice (-65^\circ\textnormal{C} <= T <=
0^\circ\textnormal{C}).pw.aw transforms dew point into saturation vapour
pressure above liquid water (-45^\circ\textnormal{C} <= T <=
60^\circ\textnormal{C}).Td transforms vapour pressure or relative humidity and
temperature into frost point above ice (-65^\circ\textnormal{C} <= T <=
0^\circ\textnormal{C}) and dew point above water (0^\circ\textnormal{C} < T <=
60^\circ\textnormal{C}) respectively.Td.aw transforms vapour pressure or relative humidity and
temperature into dew point above water (-45^\circ\textnormal{C} <= T <=
60^\circ\textnormal{C}).Tf.ai transforms vapour pressure or relative humidity and
temperature into frost point above ice (-65^\circ\textnormal{C} <= T <=
0^\circ\textnormal{C}).
Rene Locher
Guide to Meteorological Instruments and Methods of Observation, WMO, WMO-No. 8, Seventh edition, 2008, updated 2010, 1.4-29 Annex 4.B
pw(Td = c(-65, -45, 0, 30, 60)) Td(pw = pw(c(-20, 0, 20))) hr(T = c(20, 30, 40), Td = c(0, 20, 30)) ## [1] 26.20257 55.09561 57.46519 hr(T = seq(0, 60, 5), Td = 0)
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