A source of sea-level rise to rival glaciers
source: http://wwwp.dailyclimate.org/tdc-newsroom/2010/09/irrigation
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- JanforGore
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A new study finds runoff from groundwater pumping is raising sea levels as much as melting from glaciers and ice caps outside of Greenland and Antarctica.
Melting glaciers aren't the only reason coastal cities need to worry about sea-level rise.
Agriculture is pumping groundwater for irrigation at such a rate that the runoff equals the contribution from melting of glaciers and ice caps outside of Greenland and Antarctica, according to a new study looking at groundwater depletion.
It also exceeds or falls into the high-end of previous estimates of groundwater's contribution to sea-level rise, the researchers found.
Most water extracted from underground aquifers ends up in the ocean. The ceaseless pumping contributes about 0.8 millimeters of sea-level rise annually, about a quarter of the 3.1 millimeters per year scientists are observing worldwide, researchers reported.
The study, headed by Marc Bierkens of Utrecht University in Utrecht, the Netherlands, is to be published in an upcoming issue of the journal Geophysical Research Letters, the publication announced Thursday.
The study's main point was to assess the depletion rate of the vast underground stores that billions of people depend on for agriculture and drinking water and that sustain countless streams, wetlands and ecosystems.
The news wasn't good: The depletion rate has more than doubled between 1960 and 2000, with aquifers losing almost 70 cubic miles of water per year.
Because the amount of groundwater is unknown, scientists can't say how fast the global supply will vanish at this point. But if water was siphoned just as rapidly from the Great Lakes, they would go bone-dry in 80 years, according to the study.
cont.
Melting glaciers aren't the only reason coastal cities need to worry about sea-level rise.
Agriculture is pumping groundwater for irrigation at such a rate that the runoff equals the contribution from melting of glaciers and ice caps outside of Greenland and Antarctica, according to a new study looking at groundwater depletion.
It also exceeds or falls into the high-end of previous estimates of groundwater's contribution to sea-level rise, the researchers found.
Most water extracted from underground aquifers ends up in the ocean. The ceaseless pumping contributes about 0.8 millimeters of sea-level rise annually, about a quarter of the 3.1 millimeters per year scientists are observing worldwide, researchers reported.
The study, headed by Marc Bierkens of Utrecht University in Utrecht, the Netherlands, is to be published in an upcoming issue of the journal Geophysical Research Letters, the publication announced Thursday.
The study's main point was to assess the depletion rate of the vast underground stores that billions of people depend on for agriculture and drinking water and that sustain countless streams, wetlands and ecosystems.
The news wasn't good: The depletion rate has more than doubled between 1960 and 2000, with aquifers losing almost 70 cubic miles of water per year.
Because the amount of groundwater is unknown, scientists can't say how fast the global supply will vanish at this point. But if water was siphoned just as rapidly from the Great Lakes, they would go bone-dry in 80 years, according to the study.
cont.
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- Environment, Hunger, Water Scarcity, Sea Level Rise, 4 more
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JanforGore
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You don't miss the water until the well runs dry.
- 1 year ago
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JanforGore
