Science Source
Robust spring drying in the southwestern U.S. and seasonal migration of wet/dry patterns in a warmer climate
- Compares climate simulations over North America produced by a regional climate model with the driving global climate simulations as well as a multimodel ensemble of global climate simulations to investigate robust changes in water availability (precipitation (P)-evapotranspiration (E))
- Identifies a robust spring-drying signal across multiple models in the Southwest that results from a decrease in P and an increase in E in the future
- Finds the prominent changes in P-E in the boreal winter and summer are associated with a north-south dipole pattern, while in spring, the prominent changes in P-E appear as an east-west dipole pattern
- Finds the progression of the north-south and east-west dipole patterns through the seasons manifests clearly as a seasonal “clockwise” migration of wet/dry patterns, which is a robust feature of water availability changes in North America consistent across regional and global climate simulations
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