FAO-56 Penman-Monteith Daily ET_𝑜 from Linear Regression Calibrated Hargreaves Equation with Wind Terms in Tropics with Limited Data

Table 2

Numerical highlights of Figure 3; Δ = Optimum − Nadir value of the test parameter.

Test; parameter	LHGu					LHG (calibrated at 𝑢2 = 2 m/s)
	Optimum	𝑢^opt2 (m/s)	Nadir	𝑢^nadir2 (m/s)	Δ	Optimum	𝑢^opt2 (m/s)	Nadir	𝑢^nadir2 (m/s)	Δ
𝐸1	0.98	1.4	0.83	6.0	0.14	0.95	2.0	0.14	6.0	0.81
𝑟^2	1.0	1.4	0.97	6.0	0.07	1.0	1.4	0.97	6.0	0.97
Slope	0.99̇	1.8	0.93	6.0	0.07	0.99	2.0	0.68	6.0	0.68
MAE (mm/d)	0.01	1.4	0.12	6.0	−0.11	0.02	2.0	0.63	6.0	−0.60
MBE (mm/d)	0.01	1.3	−0.03	6.0	0.04	0.01	1.9	−0.63	6.0	0.64
MxAE (mm/d)	0.08	1.3	0.86	6.0	−0.78	0.15	2.0	2.1	6.0	−1.93