Scientists finally know where the Colorado River’s missing water is going

New research reveals that a lack of spring rain, not just snowpack, is the primary driver of the Colorado River's alarming water shortfall. | Contesto: cronaca

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• Scientists finally know where the Colorado River’s missing water is going

Contesto

A critical piece of the Colorado River's water puzzle has been solved, with scientists identifying a lack of spring rain as the dominant cause of the river's persistent and unexpected shortfalls. For years, water managers have watched with growing concern as the river delivered less water than forecasts predicted, even following winters with seemingly adequate mountain snowpack. New research now attributes nearly 70% of this deficit to a shift in seasonal patterns: warmer, drier springs are causing plants to consume more snowmelt and increasing evaporation, preventing that water from ever reaching the river's tributaries. The findings provide a direct scientific link between the river's declining yield and the broader, long-running 'Millennium Drought' that has gripped the southwestern United States for over two decades. The research moves beyond the traditional focus on total winter snowfall, highlighting how changing conditions during the critical spring runoff season are fundamentally altering the hydrological equation. Sunny, rainless springs are creating a double-whammy: they provide ideal growing conditions for vegetation, which draws more heavily on soil moisture from melting snow, while also driving higher rates of direct evaporation from the land surface. This process, often called 'evapotranspiration,' is now seen as the primary thief siphoning water away from the Colorado River system. "The missing piece was spring rain," explained one researcher involved in the study. The analysis shows that when spring is dry, the vast network of plants across the river's basin acts as a massive sponge, absorbing the snowmelt that water managers and downstream users depend on. This biological demand, supercharged by clearer skies and warmer temperatures, has been systematically reducing the river's flow in a way that snowfall measurements alone could not predict. The implications for water policy across seven U.S. states and Mexico are profound. For decades, river management has relied heavily on snowpack surveys to allocate water. This new understanding suggests that forecasts must now rigorously account for spring weather patterns and ecosystem water use to be...

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Categoria: cronaca