@article{fdi:010052907, title = {{A}ssessment of reference evapotranspiration methods in semi-arid regions : can weather forecast data be used as alternate of ground meteorological parameters ?}, author = {{E}r-{R}aki, {S}. and {C}hehbouni, {A}bdelghani and {K}habba, {S}. and {S}imonneaux, {V}incent and {J}arlan, {L}ionel and {O}uldbba, {A}. and {R}odriguez, {J}.{C}. and {A}llen, {R}.}, editor = {}, language = {{ENG}}, abstract = {{I}n this study, the performance of three empirical methods for estimating reference evapotranspiration ({ET}0): {M}akkink ({M}ak) and {P}riestley-{T}aylor ({PT}) (radiation-based) and {H}argreaves-{S}amani ({HARG}) (temperature-based) were assessed in semi-and regions. {T}he values of {ET}0 derived using these three methods were compared to those estimated using the reference {FAO} {P}enman-{M}onteith ({FAO}-{PM}) method under semi-arid conditions of the {T}ensift basin (central of {M}orocco) and the {Y}aqui {V}alley ({N}orthwest {M}exico). {T}he results showed that the {HARG} method is the best one to estimate {ET}0 over both semi-and test sites. {C}onversely, the performance of the other two empirical methods was poor except under humid conditions. {H}owever when the parameters alpha and {C}-m figurate in the {PT} and {M}ak equations are locally calibrated, the performance of these two methods greatly improved. {A}dditionally, this study showed that, when measurements of meteorological parameters needed for estimating {ET}0 (which are not always available especially in developing countries) are lacking, the climatic data generated with numerical weather prediction models provide an alternative and effective solution to estimate {ET}0. {I}n this regard, data generated using a weather forecast model ({ALADIN}) over the {T}ensift basin showed that the {HARG} model is the most accurate one for estimating the spatio-temporal variability of {ET}0.}, keywords = {{ALADIN} model ; {R}eference evapotranspiration ; {S}emi-arid environment ; potential evapotranspiration ; penman-monteith ; model ; crop ; evaporation ; equations ; eto}, booktitle = {}, journal = {{J}ournal of {A}rid {E}nvironments}, volume = {74}, numero = {12}, pages = {1587--1596}, ISSN = {0140-1963}, year = {2010}, DOI = {10.1016/j.jaridenv.2010.07.002}, URL = {https://www.documentation.ird.fr/hor/fdi:010052907}, }