New Research Highlights Importance of Climate Modeling in Understanding Seasonal Precipitation Variability

Investigations conducted by Wollo University have provided valuable insights into the importance of climate modeling in analyzing seasonal and annual variability of precipitation. According to the research, projected climate data plays a vital role in comprehending the trends of precipitation in the Abbay and Awash river basins, Ethiopia. The study evaluated the performance of three regional climate models (RCMs) using five bias correction techniques, indicating that RACMO has good performance in both basins compared to RCA4 and RCA. The results showed that the seasonal and annual variability trend of future precipitation in the Abbay river will be decreased by 0.45% from 2026 to 2067 and increased by 1.31% from 2068 to 2100, whereas in the Awash river basin, it will be decreased by 28.88% and 24.7% from 2026 to 2067 and 2068 to 2100, respectively, compared to the historical precipitation trend from 1973 to 2014.

Key Takeaways:

• The study highlights the significance of climate modeling in understanding the seasonal and annual variability of precipitation in the Abbay and Awash river basins, Ethiopia.
• The research used three regional climate models (RCMs) and five bias correction techniques to evaluate their performance in simulating seasonal variability of precipitation.
• The results indicated that RACMO performed well in both basins compared to RCA4 and RCA, with R2 and MAPE values of 0.9999 and 1.67 for Abbay and 0.9999 and 1.44 for Awash river basins, respectively.
• The study found that the seasonal and annual variability trend of future precipitation in the Abbay river will be decreased by 0.45% from 2026 to 2067 and increased by 1.31% from 2068 to 2100.
• In contrast, the Awash river basin will experience a decrease in precipitation by 28.88% and 24.7% from 2026 to 2067 and 2068 to 2100, respectively, compared to the historical precipitation trend from 1973 to 2014.
• The research emphasized the need for policymakers and the Ethiopian Ministry of Water and Energy to develop effective water resource management strategies to balance demand and supply variability in the Abbay and Awash river basins.

Statistics:

• 29 rainfall stations were selected to evaluate the models based on long-term observed data (1973-2014) and projected data.
• The study used five bias correction techniques: linear scaling, power transformation, and three other techniques.
• The R2 and MAPE values for RACMO in the Abbay river basin were 0.9999 and 1.67, respectively.
• The R2 and MAPE values for RACMO in the Awash river basin were 0.9999 and 1.44, respectively.
• The seasonal and annual variability trend of future precipitation in the Abbay river will be decreased by 0.45% from 2026 to 2067.
• The seasonal and annual variability trend of future precipitation in the Awash river will be decreased by 28.88% and 24.7% from 2026 to 2067 and 2068 to 2100, respectively.

Sources:

• Evaluating the performance of regional climate models to simulate seasonal variability of precipitation in Abbay and Awash river basins, Ethiopia. Discover Water, 2025, 5(1):1-18.
• Kassa Abera Tareke, Department of Hydraulics and Water Resource Engineering, Kombolcha Institute of Technology (KioT), Wollo University.