Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A third of the world’s biggest groundwater basins are in distress

17.06.2015

Reserves likely far smaller than previously thought, new studies find

Human consumption is rapidly draining about a third of its largest groundwater basins, despite having little to no accurate data about how much water remains in them, according to two new studies led by the University of California, Irvine, using data from NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites.


Groundwater storage trends for Earth’s 37 largest aquifers from UCI-led study using NASA GRACE data (2003 – 2013). Of these, 21 have exceeded sustainability tipping points and are being depleted, with 13 considered significantly distressed, threatening regional water security and resilience. Credit: UC Irvine / NASA

The result is that significant segments of Earth’s population are consuming groundwater quickly without knowing when it might run out, the researchers conclude. The new findings have been accepted for publication in Water Resources Research, a journal of the American Geophysical Union, and appear online today.

“Available physical and chemical measurements are simply insufficient,” said University of California Irvine professor and principal investigator Jay Famiglietti, who is also the senior water scientist at NASA’s Jet Propulsion Laboratory. “Given how quickly we are consuming the world’s groundwater reserves, we need a coordinated global effort to determine how much is left.”

The studies are the first to characterize groundwater losses via data from space, using readings generated by NASA’s twin Gravity Recovery and Climate Experiment (GRACE) satellites that measure dips and bumps in Earth’s gravity, which is affected by the weight of water.

For the first paper, researchers examined the planet’s 37 largest aquifers between 2003 and 2013. The eight worst off were classified as overstressed, with nearly no natural replenishment to offset usage. Another five aquifers were found, in descending order, to be extremely or highly stressed, depending upon the level of replenishment in each – still in trouble but with some water flowing back into them.

The most overburdened are in the world’s driest areas, which draw heavily on underground water. Climate change and population growth are expected to intensify the problem.

“What happens when a highly stressed aquifer is located in a region with socioeconomic or political tensions that can’t supplement declining water supplies fast enough?” asked the lead author on both studies, Alexandra Richey, who conducted the research as a UCI doctoral student. “We’re trying to raise red flags now to pinpoint where active management today could protect future lives and livelihoods.”

The research team – which included co-authors from NASA, the National Center for Atmospheric Research, National Taiwan University and UC Santa Barbara – found that the Arabian Aquifer System, an important water source for more than 60 million people, is the most overstressed in the world.

The Indus Basin aquifer of northwestern India and Pakistan is the second-most overstressed, and the Murzuk-Djado Basin in northern Africa is third. California’s Central Valley, utilized heavily for agriculture and suffering rapid depletion, was slightly better off but still labeled highly stressed in the first study.

“As we’re seeing in California right now, we rely much more heavily on groundwater during drought,” Famiglietti said. “When examining the sustainability of a region’s water resources, we absolutely must account for that dependence.”

In a companion paper appearing online today in the same journal, the scientists conclude that the total remaining volume of the world’s usable groundwater is poorly known, with often widely varying estimates, but is likely far less than rudimentary estimates made decades ago.

By comparing their satellite-derived groundwater loss rates to what little data exists on groundwater availability, they found major discrepancies in projected “time to depletion.” In the overstressed Northwest Sahara Aquifer System, for example, this fluctuated between 10 and 21,000 years.

“We don’t actually know how much is stored in each of these aquifers. Estimates of remaining storage might vary from decades to millennia,” Richey said. “In a water-scarce society, we can no longer tolerate this level of uncertainty, especially since groundwater is disappearing so rapidly.”

The study notes that the dearth of groundwater is already leading to significant ecological damage, including depleted rivers, declining water quality and subsiding land.

Groundwater aquifers are typically located in soil or deeper rock layers beneath Earth’s surface. The depth and thickness of many make it tough and costly to drill to or otherwise reach bedrock and learn where the moisture bottoms out. But it has to be done, according to the authors.

###

The American Geophysical Union is dedicated to advancing the Earth and space sciences for the benefit of humanity through its scholarly publications, conferences, and outreach programs. AGU is a not-for-profit, professional, scientific organization representing more than 60,000 members in 139 countries. Join the conversation on Facebook, Twitter, YouTube, and our other social media channels.

PDF copies of the articles are available for free by clicking on these links:

http://onlinelibrary.wiley.com/doi/10.1002/2015WR017349/abstract?campaign=wlytk-41855.5282060185

http://onlinelibrary.wiley.com/doi/10.1002/2015WR017351/abstract?campaign=wlytk-41855.5282060185

Or, you may order a copy of the final papers by emailing your request to Nanci Bompey at nbompey@agu.org. Please provide your name, the name of your publication, and your phone number.

Neither the papers nor this press release is under embargo.
Title
“Quantifying renewable groundwater stress with GRACE” and “Uncertainty in global groundwater storage estimates in a total groundwater stress framework”

Authors:

“Quantifying renewable groundwater stress with GRACE”

Alexandra S. Richey: Department of Civil & Environmental Engineering, University of California, Irvine, CA, USA;

Brian F. Thomas: NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;

Min-Hui Lo: Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan;

John T. Reager: NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;

James S. Famiglietti: Department of Civil & Environmental Engineering, University of California, Irvine, CA, USA; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA; and Department of Earth System Science, University of California, Irvine, CA, USA;

Katalyn Voss: Department of Geography, University of California, Santa Barbara, CA, USA;

Sean Swenson: Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, USA;

Matthew Rodell: Hydrologic Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA.

“Uncertainty in global groundwater storage estimates in a total groundwater stress framework”

Alexandra S. Richey: Department of Civil & Environmental Engineering, University of California, Irvine, CA, USA;

Brian F. Thomas: NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;

Min-Hui Lo: Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan;

James S. Famiglietti: Department of Civil & Environmental Engineering, University of California, Irvine, CA, USA; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA; and Department of Earth System Science, University of California, Irvine, CA, USA;

Sean Swenson: Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, USA;

Matthew Rodell: Hydrologic Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA.

Jay Famiglietti, +1 (626) 755-7661, James.Famiglietti@jpl.nasa.gov


AGU Contact:
Nanci Bompey
+1 (202) 777-7524
nbompey@agu.org

University of California Irvine Contact:
Janet Wilson
+1 (949) 824-3969
janethw@uci.edu

NASA JPL Contact:
Alan Buis
+1 (818) 354-0474
alan.buis@jpl.nasa.gov

Nanci Bompey | American Geophysical Union

More articles from Earth Sciences:

nachricht From volcano's slope, NASA instrument looks sky high and to the future
27.04.2017 | NASA/Goddard Space Flight Center

nachricht Penn researchers quantify the changes that lightning inspires in rock
27.04.2017 | University of Pennsylvania

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>