Mathematics – Logic
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3618401t&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 18, CiteID L18401
Mathematics
Logic
19
Geodesy And Gravity: Time Variable Gravity (7223, 7230), Hydrology: Groundwater Hydrology, Hydrology: Anthropogenic Effects (4802, 4902)
Scientific paper
Northern India and its surroundings, home to roughly 600 million people, is probably the most heavily irrigated region in the world. Temporal changes in Earth's gravity field in this region as recorded by the GRACE satellite mission, reveal a steady, large-scale mass loss that we attribute to excessive extraction of groundwater. Combining the GRACE data with hydrological models to remove natural variability, we conclude the region lost groundwater at a rate of 54 ± 9 km3/yr between April, 2002 (the start of the GRACE mission) and June, 2008. This is probably the largest rate of groundwater loss in any comparable-sized region on Earth. Its likely contribution to sea level rise is roughly equivalent to that from melting Alaskan glaciers. This trend, if sustained, will lead to a major water crisis in this region when this non-renewable resource is exhausted.
Swenson Sean
Tiwari Virendra M.
Wahr John
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