2009年11月12日

India's lost water

Water resourses are at a premium in many parts of the world, and India is one of them.

Indirect evdence suggests that groundwater in being consumed faster than it is being naturally replenished in northwest Indea, but assessments of large-scale rates of depletion are difficult to construct from ground-based measurements.

Gravity observations from NASA's Gravity Recovery and Climate Experiment (GRACE) satellites, combined with land surface models, have been used to produce a time series of groundwater strage variations in India.

The analysis reveals a progressively more severe reduction in groundwater in Northwestern India between 2002 and 2008.

Groundwater has been depleted at a mean rate of 4.0 cm of water per year averaged over the northern Ibdian states of Rajasthan, Punjab and Haryana.

The authors consider unsustainable consumption of groundwater for irrigation and other anthropogenic uses as the most likely cause.


### DataBace ###
nature Vol.460 925-1050 Issue no.7258 20 August 2009
Letter p999 / Satellite-based estimates of groundwater depletion in India / M Rodell et al.

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