Publications des scientifiques de l'IRD

Ramarohetra J., Sultan Benjamin. (2018). Impact of ET0 method on the simulation of historical and future crop yields : a case study of millet growth in Senegal. International Journal of Climatology, 38 (2), p. 729-741. ISSN 0899-8418.

Titre du document
Impact of ET0 method on the simulation of historical and future crop yields : a case study of millet growth in Senegal
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000423816900015
Auteurs
Ramarohetra J., Sultan Benjamin
Source
International Journal of Climatology, 2018, 38 (2), p. 729-741 ISSN 0899-8418
The reference evapotranspiration (ET0) is an integrated climatic variable from which many crop models derive simulated crop yields. In most of these models, different equations are parameterized leaving the choice of the equation to the user. However, the impact of the choice of the ET0 equations on crop yield prediction has been little studied. The present study proposes a sensitivity analysis of the impact of the choice of the ET0 equation on simulated millet yields using SARRA-H crop model over 12 Senegalese stations representative of the Sudano-Sahelian climate conditions of West Africa. Priestley-Taylor, a modified Priestley-Taylor and Hargreaves equations lead to simulated yields up to 19% than those calculated using the Penman-Monteith equation. Despite high biases in wind speed, among the tested methods, the Penman-Monteith method remains the most robust to derive ET0 and yield over the major part of Senegal, Hargreaves equation being more appropriated under dry climates. The choice of ET0 formulation introduces uncertainties representing 8% of baseline yield regardless of precipitation changes; for wet conditions these uncertainties approach 30% of the overall climate change impact. The choice of ET0 equation is increasingly important, with local temperature changes out to 4 degrees C, while extreme changes above 6 degrees C depend less on the ET0 equation.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Sciences du milieu [021] ; Bioclimatologie [072] ; Sciences du monde végétal [076]
Description Géographique
SENEGAL
Localisation
Fonds IRD [F B010072067]
Identifiant IRD
fdi:010072067
Contact