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NASA study warns of freshwater decline in India

Friday - May 18, 2018 11:30 am , Category : SCIENCE & TECHNOLOGY
 NASA study warns of freshwater decline in India
NASA study warns of freshwater decline in India
Washington May 18 (IANS) Availability of freshwater has declined in the northern and eastern parts of India says a new study that combined an array of NASA satellite observations of Earth with data on human activities to map locations where freshwater is changing around the globe.
The study published in the journal Nature found that Earth s wetland areas are getting wetter and dry areas are getting drier due to a variety of factors including human water management climate change and natural cycles.
Areas in northern and eastern India the Middle East California and Australia are among the hotspots where overuse of water resources has caused a serious decline in the availability of freshwater and without corrective actions by the governments to preserve water the situation is likely to worsen in these areas the Guardian reported this week citing the study.
The first-of-its-kind study used 14 years of observations from the US/German-led Gravity Recovery and Climate Experiment (GRACE) spacecraft mission to track global trends in freshwater in 34 regions around the world.
"This is the first time that we ve used observations from multiple satellites in a thorough assessment of how freshwater availability is changing everywhere on Earth " said Matt Rodell of NASA s Goddard Space Flight Center in Greenbelt Maryland
"A key goal was to distinguish shifts in terrestrial water storage caused by natural variability - wet periods and dry periods associated with El Nino and La Nina for example - from trends related to climate change or human impacts like pumping groundwater out of an aquifer faster than it is replenished " Rodell added.
Freshwater is found in lakes rivers soil snow groundwater and ice. Freshwater loss from the ice sheets at the poles - attributed to climate change - has implications for sea level rise.
On land freshwater is one of the most essential of Earth s resources for drinking water and agriculture.
The researchers found that while some regions water supplies are relatively stable others experienced increases or decreases.
"What we are witnessing is major hydrologic change " said co-author Jay Famiglietti of NASA s Jet Propulsion Laboratory (JPL) in Pasadena California.
"We see a 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 " Famiglietti warned.
Famiglietti noted that while water loss in some regions like the melting ice sheets and alpine glaciers is clearly driven by warming climate it will require more time and data to determine the driving forces behind other patterns of freshwater change.
However the GRACE satellite observations alone couldn t tell the researchers what was causing the apparent trends.
"We examined information on precipitation agriculture and groundwater pumping to find a possible explanation for the trends estimated from GRACE " said co-author Hiroko Beaudoing of Goddard and the University of Maryland in College Park.

--IANS gb/vm

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