norm_humidity: Normalized humidity

Description Usage Arguments Details

Description

norm_humidity returns the normalized humidity, h_{n} [-], given the saturation vapor pressure at the surface of a lake and atmospheric vapor pressure.

Usage

1
norm_humidity(els, ea)

Arguments

els

Saturation vapor pressure at the surface of a lake, e_{ls} (kPa).

ea

Vapor pressure of the atmosphere, e_{a} (kPa).

Details

Normalized humidity is defined by (Horita et al. 2008):

h_{n} = 1 - \frac{(e_{ls} - e_{a})}{e_{ls}}

See Horita et al. (2008) for a discussion concerning the use of relative vs normalized humidity in the Craig-Gordon model. Also note that this formulation of normalized humidity assumes the activity coefficient of water is 1, which is reasonable for most freshwater systems.

Horita J, K Rozanski, S Cohen. 2008. Isotope effects in the evaporation of water: A status report of the Craig-Gordon model. Isotopes in environmental and health studies 44 (1): 23–49. DOI: 10.1080/10256010801887174.


jmerc13/LakeIsodrology documentation built on May 5, 2019, 5:52 p.m.