potential evapotranspiration by the Penman-Monteith method, Victor Miguel Ponce, San Diego State University

online_penman_monteith: Potential evapotranspiration by the Penman-Monteith method

Formulas

(e_s-e_a) ≅ (e_o-e_a) = e_o[1 + (φ/100)]
E_n = Q_n/(ρλ)
E_a = 86400[(ρ_ac_p)/(ρλγ)](e_s-e_a)(r_s+r_a)^-1

Δ = (0.00815 T_a + 0.8912)⁷
γ∗ = γ [1 + (r_s/r_a)]
E = (Δ E_n + γ∗ E_a) / (Δ + γ∗)

INPUT DATA:

[Description]       [Sample input]

Month:
Air temperature T_a (^oC):

Net radiation Q_n (cal cm^-2 d^-1):

Relative humidity φ (%):

Wind velocity v₂ (km d^-1):

Atmospheric pressure p (mb):

[Leave blank to specify sea-level atmospheric pressure]

ECHO OF INPUT:

Please enter input data and press 'Calculate'.
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