Description Usage Arguments Details
norm_humidity
returns the normalized humidity, h_{n} [-],
given the saturation vapor pressure at the surface of a lake and atmospheric
vapor pressure.
1 | norm_humidity(els, ea)
|
els |
Saturation vapor pressure at the surface of a lake, e_{ls} (kPa). |
ea |
Vapor pressure of the atmosphere, e_{a} (kPa). |
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.
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