Retrieving air humidity, global solar radiation, and reference evapotranspiration from daily temperatures: development and validation of new methods for Mexico. Part III: reference evapotranspiration
We evaluated two methods to estimate evapotranspiration ( ETo ) from minimal weather records (daily maximum and minimum temperatures) in Mexico: a modified reduced set FAO-Penman-Monteith method (Allen et al. 1998 , Rome, Italy) and the Hargreaves and Samani (Appl Eng Agric 1(2): 96–99, 1985 ) metho...
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Published in | Theoretical and applied climatology Vol. 133; no. 3-4; pp. 787 - 797 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Vienna
Springer Vienna
01.08.2018
Springer Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | We evaluated two methods to estimate evapotranspiration (
ETo
) from minimal weather records (daily maximum and minimum temperatures) in Mexico: a modified reduced set FAO-Penman-Monteith method (Allen et al.
1998
, Rome, Italy) and the Hargreaves and Samani (Appl Eng Agric 1(2): 96–99,
1985
) method. In the reduced set method, the FAO-Penman-Monteith equation was applied with vapor pressure and radiation estimated from temperature data using two new models (see first and second articles in this series): mean temperature as the average of maximum and minimum temperature corrected for a constant bias and constant wind speed. The Hargreaves-Samani method combines two empirical relationships: one between diurnal temperature range Δ
T
and shortwave radiation
Rs
, and another one between average temperature and the ratio
ETo/Rs
: both relationships were evaluated and calibrated for Mexico. After performing a sensitivity analysis to evaluate the impact of different approximations on the estimation of
Rs
and
ETo
, several model combinations were tested to predict
ETo
from daily maximum and minimum temperature alone. The quality of fit of these models was evaluated on 786 weather stations covering most of the territory of Mexico. The best method was found to be a combination of the FAO-Penman-Monteith reduced set equation with the new radiation estimation and vapor pressure model. As an alternative, a recalibration of the Hargreaves-Samani equation is proposed. |
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ISSN: | 0177-798X 1434-4483 |
DOI: | 10.1007/s00704-017-2213-7 |