The planet’s water cycle is shifting in ways never seen before, and human activities are largely responsible for these changes, according to new NASA research. These shifts could force communities worldwide to rethink how they manage their water resources.
Drawing on nearly two decades of satellite observations, scientists have documented significant changes in how water moves and is stored around the globe, with implications for everything from agriculture to flood control.
“We established with data assimilation that human intervention in the global water cycle is more significant than we thought,” says Sujay Kumar, a research scientist at NASA’s Goddard Space Flight Center and co-author of the study published in the Proceedings of the National Academy of Sciences.
A New Normal for Water Resources
The research reveals that many assumptions about water patterns may no longer hold true. This poses challenges for infrastructure planning and resource management, which have historically relied on the idea that water cycles stay within predictable ranges.
“This may no longer hold true for some regions,” explains lead author Wanshu Nie, a research scientist at NASA Goddard. She emphasizes that their findings could help guide improvements in assessing water resource variability and planning sustainable management strategies.
Complex Changes
The scientists identified three key types of changes in the water cycle: long-term trends, such as declining groundwater levels; shifts in seasonal patterns, like earlier growing seasons or snowmelt; and changes in extreme events, with historically rare floods occurring more frequently.
North China provides a striking example of these complex interactions. Despite ongoing drought conditions, vegetation in many areas continues to thrive because farmers keep pumping groundwater for irrigation. This human intervention creates ripple effects throughout the local water cycle.
A Global View from Space
To track these changes, the research team combined data from multiple NASA satellite missions collected between 2003 and 2020. This included precipitation measurements from the Global Precipitation Measurement mission, soil moisture data from the European Space Agency, and groundwater observations from the Gravity Recovery and Climate Experiment satellites.
“This paper combines several years of our team’s effort in developing capabilities on satellite data analysis, allowing us to precisely simulate continental water fluxes and storages across the planet,” notes Augusto Getirana, a NASA Goddard research scientist and study co-author.
Looking Ahead
The findings suggest that climate models used to predict future water cycles need updating to better account for human activities. With more accurate data and improved models, communities could better understand and plan for their “new normal” water situations.
As regions worldwide grapple with shifting precipitation patterns and water availability, this research provides crucial insights for adapting water management strategies to an increasingly unpredictable future.
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