To improve the management of water resources at the plot to basin size, it is essential to comprehend the spatiotemporal variability of real evapotranspiration (ET). This is especially true in the Sahelian area, which has very little monitoring and is extremely susceptible in terms of agricultural and water resources. Monitoring evapotranspiration (ET) in areas with limited measurements is made easier by the growing variety of ET products. The study compares twenty ET products and collections from two regions in Central Senegal and South-Western Niger in an effort to better understand ET in Sahelian agrosystems. The top-performing products use soil water stress directly in their algorithm for estimating ET. Nevertheless, none of the devices combine strong performance with high spatial and temporal resolutions. Overall, as the solutions that take soil moisture into account often perform better, the comparison emphasizes the necessity of doing so in order to effectively estimate ET in the Sahelian region. It also highlights how the Sahel lacks a high-quality, high-resolution ET product.
https://www.sciencedirect.com/science/article/abs/pii/S0022169424019814