Top
Begin typing your search above and press return to search.
exit_to_app
Outlook for BJP in Kerala
access_time 2021-05-06T11:21:07+05:30
Not Covid deaths, but mass murder
access_time 2021-05-05T10:52:36+05:30
Poll results that carry lessons
access_time 2021-05-04T10:39:06+05:30
The whistles of danger that must be heard
access_time 2021-04-30T11:44:21+05:30
DEEP READ
Iran and the revival of JCPOA
access_time 2021-04-23T13:21:09+05:30
A model mosque in Gujarat
access_time 2021-04-12T17:13:34+05:30
Towards a digital emergency?
access_time 2021-02-27T14:50:41+05:30
The slaughter of democracy in Puducherry
access_time 2021-02-24T11:27:21+05:30
Populist Fascism
access_time 2021-01-31T17:19:29+05:30
Media Freedom
access_time 2021-01-31T15:47:07+05:30
exit_to_app
Homechevron_rightTechnologychevron_rightNASA satellites reveal ...

NASA satellites reveal freshwater decline in India

text_fields
bookmark_border
NASA satellites reveal freshwater decline in India
cancel

Washington: India is among the hotspots where overuse of water resources has caused a serious decline in the availability of freshwater, according to a first-of-its-kind study using an array of NASA satellite observations of Earth.

Scientists led by NASA's Goddard Space Flight Center in the US used data on human activities to map locations where freshwater is changing around the globe and why.

The study, published in the journal Nature, found that Earth's wet land 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 that is already causing problems, 'The Guardian' reported.

In northern India, groundwater extraction for irrigation of crops such as wheat and rice have caused a rapid decline in available water, despite rainfall being normal throughout the period studied, the report said.

"The fact that extractions already exceed recharge during normal precipitation does not bode well for the availability of groundwater during future droughts,” researchers said.

The team 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 have 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.

On land, freshwater is one of the most essential of Earth's resources, for drinking water and agriculture. While some regions' water supplies are relatively stable, others experienced increases or decreases.

"What we are witnessing is major hydrologic change," said Jay Famiglietti of NASA's Jet Propulsion Laboratory (JPL).

"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," said Famiglietti.

He 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.

Show Full Article
TAGS:
Next Story