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 Predicting eruptions using satellites and math
28.06.2017 | Frontiers

nachricht NASA sees quick development of Hurricane Dora
27.06.2017 | NASA/Goddard Space Flight Center

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Fraunhofer Researchers Develop High-Pressure Sensors for Extreme Temperature

28.06.2017 | Power and Electrical Engineering

Zeolite catalysts pave the road to decentral chemical processes Confined space increases reactivity

28.06.2017 | Life Sciences

Extensive Funding for Research on Chromatin, Adrenal Gland, and Cancer Therapy

28.06.2017 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>