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)Relative humidity in \([\textnormal{\%}]\).
Temperature of air in \([^\circ \textnormal{C}]\).
Dew point of air in \([^\circ \textnormal{C}]\).
Saturation vapour pressure in \([\textnormal{hPa}]\).
When TRUE and arguments are out of range, a warning is thrown.
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 (\(-65^\circ\textnormal{C} <= T <=
0^\circ\textnormal{C}\)).
All vapour pressures correspond to pure water vapour and are not adjusted to water vapour in air.
Guide to Meteorological Instruments and Methods of Observation, WMO, WMO-No. 8, Seventh edition, 2008, updated 2010, 1.4-29 Annex 4.B
# NOT RUN {
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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