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However, some scientists are concerned about the reliability of these estimates. Richard Taylor, a hydrologis DC Sneakers, t at University College London, believes Tiwari and his colleagues may have overestimated the groundwater depletion in northern India, due to a lack of ground-based observations with which to compare air jordan 16, the satellite data.

“Satellite data alone are insufficient and can give erroneous results,” Taylor said.

Nonetheless Taylor still believes GRACE has an important role to play air jordan nu, . “Land-based monitoring is difficult and expensive. GRACE doesn’t replace the need for this monitoring but is an immensely useful tool for integrating borehole observations and detecting regiona air jordan melo m7, l-scale changes in water resources,” he said.

Back in North America …

Back in the North America, GRACE is enabling scientists to monitor aquifers and understand the impact of wa visvim shoes size, ter pumping and various land-use activities.

Jay Famiglietti, a member of the GRACE science team based at the University of California, Irvine, has been using GRACE data to monitor the state’s mens nike cortez, groundwater fluctuations.

“Our results are providing new information on the declining water levels in the Central Valley, where one quarter of the food consumed in the United States is g nike free slippers, rown,” Famiglietti said. “Our studies are revealing rapid depletion rates over the last six years that could ultimately put food production in the region at risk.”

If California nike cortez, does decide to regulate groundwater use, GRACE could prove invaluable in helping authorities to police it, according to experts.

However, GRACE will only be able to do this if its satellites nike air flightposite, remain in the sky. Already the satellites have passed the five-year lifetime of the planned mission, and a follow-up mission is not planned for at least ten years.