Climate Change Increases Risk of Upper Colorado River Basin Snow Droughts
A recent study from the Colorado School of Mines confirms that human-driven climate change has made severe snow droughts in the Upper Colorado River Basin 14 times more likely. Published in the Proceedings of the National Academy of Sciences, the research links current warming trends to a 25% increase in moisture loss from snowpack compared to pre-industrial conditions. Modeling suggests that by the 2090s, low-snow years could occur in nearly 90% of seasons if greenhouse gas emissions remain at current moderate levels.
Linking Short-Term Droughts to Decadal Warming
Climate scientists are increasingly moving beyond the traditional distinction between isolated weather events and long-term climate patterns. Adrienne Marshall, a climate hydrology expert and assistant professor at the Colorado School of Mines, utilized extreme event attribution to analyze the severity of recent snow conditions. By comparing current data against conditions from 1850 to 1900, the study determined that climate change has fundamentally altered the probability of drought. While the Western United States as a whole saw a fourfold increase in risk, the Upper Colorado River Basin—the headwaters for much of the region’s water—faces a 14-fold surge in likelihood.
Did you know?
The moisture lost from snowpack during recent severe drought years is equivalent to the total volume of Lake Mead, the largest reservoir in the United States.
Projecting Water Scarcity Through 2090
The research modeling assumes a continuation of moderate greenhouse gas emissions, a scenario widely accepted by international climate scientists. Under these conditions, the frequency of severe snow droughts is projected to climb steadily. Researchers estimate that in the 2020s, one in 10 years will experience these conditions. That figure is expected to rise to three out of every 10 years by the 2050s, reaching 87% of years by the 2090s. Marshall notes that while long-term emissions reductions are essential to curbing these risks, significant near-term impacts are already locked into the climate system due to existing temperature increases.
Societal Adaptation and Local Water Usage
As municipalities grapple with these projections, the focus is shifting toward large-scale water conservation. Denver Water recently alerted 1.5 million customers that current conservation efforts are insufficient to meet a target reduction of 20% compared to average years. Marshall suggests that individual actions, such as lawn replacement and the adoption of low-water landscaping, represent a necessary shift in societal behavior. She emphasizes that while the data presents a sobering outlook, lower emissions scenarios remain a viable path to reducing the frequency of extreme snow droughts.
Frequently Asked Questions
How much more likely is a snow drought due to climate change?
According to the Colorado School of Mines, climate change has made severe snow droughts in the Upper Colorado River Basin 14 times more likely compared to pre-industrial times.
What does the study suggest for the 2050s?
Modeling indicates that by the 2050s, snowpack droughts similar to those seen in recent years will occur in approximately 32% of years.
Can individual conservation efforts help?
Researchers point to lawn replacement and low-water landscaping as practical steps for households to adapt to a drying climate, though they note that these efforts must be pursued at a societal level.
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