The study, published in the May 17, 2018 issue of the journal Nature, also incorporated satellite precipitation data from the ESSIC-led Global Precipitation Climatology Project; Landsat imagery from NASA and the U.S. Geological Survey; irrigation maps; and published reports of human activities related to agriculture, mining and reservoir operations. The study period spans from 2002 to 2016.
“This is the first time we’ve assessed how freshwater availability is changing, everywhere on Earth, using satellite observations,” said Matt Rodell, lead author of the paper and chief of the Hydrological Sciences Laboratory at NASA’s Goddard Space Flight Center. “A key goal was to distinguish shifts in terrestrial water storage caused by natural variability—wet periods and dry periods associated with El Niño and La Niña, for example—from trends related to climate change or human impacts, like pumping groundwater out of an aquifer faster than it is replenished.”
Freshwater is present in lakes, rivers, soil, snow, groundwater and glacial ice. Its loss in the ice sheets at the poles—attributed to climate change—has implications for sea level rise. On land, it is one of Earth’s most essential resources for drinking water and irrigation. While some regions’ water supplies are relatively stable, others normally experience increases or decreases. But the current study revealed a new and distressing pattern.
“What we are witnessing is major hydrologic change,” said co-author James Famiglietti of NASA’s Jet Propulsion Laboratory. “We see, for the first time, a very distinctive pattern of the wet land areas of the world getting wetter—those are the high latitudes and the tropics—and the dry areas in between getting dryer. Embedded within the dry areas we see multiple hotspots resulting from groundwater depletion.”
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