E_Thornthwaite: Lake evaporation (Thornethwaite method)
In jmerc13/LakeIsodrology: Lake isotope hydrology

E_Thornthwaite returns the daily evaporation, E (mm day^{-1}) using temperature data.

1 2	E_Thornthwaite(Ta, I, day, a = 1.6, b = 6.75e-07, c = 7.71e-05, d = 0.0179, e = 0.49, conv = 10)

`Ta`	Air temperature, T_{a} (C).
`I`	Annual heat index, I (-).
`day`	Number of days in a month, day (days).
`a`	An emperical coefficient, assumed to be 1.6.
`b`	An emperical coefficient, assumed to be 6.75e-7.
`c`	An emperical coefficient, assumed to be 7.71e-5.
`d`	An emperical coefficient, assumed to be 1.79e-2.
`e`	An emperical coefficient, assumed to be 0.49.
`conv`	A multiplier that converts base units to mm/day. It is assumed to be 10, but will need to be adjust for alternative units.

E is determined via (Thornthwaite 1948, Rosenberry et al. 2007):

E = \bigg(a \bigg(\frac{10 T_{a}}{I} \bigg)^{b I^{3} - c I^{2} + d I + e} \bigg) \frac{10}{day}

Thornthwaite CW. 1948. An approach toward a rational classification of climate. Geographical Review 38 (1): 55. DOI: 10.2307/210739.

Rosenberry DO, Winter TC, Buso DC, Likens GE. 2007. Comparison of 15 evaporation methods applied to a small mountain lake in the northeastern USA. Journal of Hydrology 340 (3–4): 149–166. DOI: 10.1016/j.jhydrol.2007.03.018.

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