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  • Presentation | H14E: Advancing Hydrologic Modeling and Prediction Using Large-Domain Meteorological and Hydrologic Datasets III Oral
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  • H14E-04: Refining the Assessment of the “Dry Gets Drier, Wet Gets Wetter” Paradigm Using a Budyko-Based Approach with Global Hydrological Simulation Data
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Author(s):
Kosuke Yamamoto, Japan Aerospace Exploration Agency (First Author, Presenting Author)
Kei Yoshimura, The University of Tokyo
Misako Kachi, Japan Aerospace Exploration Agency


The phrase “dry gets drier, wet gets wetter” (DDWW) is often used to describe how climate change affects the global water cycle. However, some recent studies suggest that this idea may not always apply, especially over land.


In this study, we tested whether the DDWW trend holds true using Today’s Earth, a real-time global hydrological system. This system combines satellite-based rainfall data (GSMaP) with advanced land and river models to simulate how water and energy move across the land surface. It provides detailed estimates at high spatial and temporal resolutions and is currently being upgraded to a finer 0.1-degree resolution.


Using a well-known method called the Budyko framework, we examined long-term relationships between rainfall, evaporation, and climate dryness across the globe. We then analyzed how these patterns have changed over time.


Our results show that the DDWW trend is seen in only 18% of land areas, while the opposite trend—“dry gets wetter, wet gets drier”—is found in 19%. These findings suggest that climate-driven changes in water availability are more complex than previously thought and highlight the value of high-resolution monitoring systems for understanding and managing water resources.




Scientific Discipline
Neighborhood
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Main Session
Discussion