Along with a warming climate and intensified human activities, recent water storage in global landlocked basins has undergone a widespread decline. A new study reveals this decline has aggravated local water stress and caused potential sea level rise.
The study, "Recent Global Decline in Endorheic Basin Water Storage," was carried out by a team of scientists from six countries and appears in the current issue of Nature Geoscience.
This illustration shows terrestrial water storage changes in global endorheic basins from GRACE satellite observations, April 2002 to March 2016. In the top image, terrestrial water storage trends -- in millimeters of equivalent water thickness per year -- for each endorheic unit are highlighted, followed by animated monthly terrestrial water storage anomalies, also in millimeters. The bottom image shows monthly net terrestrial water storage anomalies in gigatonnes, in global endorheic and exorheic systems -- excluding Greenland, Antarctica and the oceans -- and linkage to the El Niño-Southern Oscillation, right axis. Terrestrial water storage anomalies are relative to the time-mean baseline in each unit or system, with removal of seasonality. For comparison, 360 gigatonnes of terrestrial water storage equals 1 millimeter of sea level equivalent. Courtesy of Jida Wang.
Credit: Kansas State University
"Water resources are extremely limited in the continental hinterlands where streamflow does not reach the ocean. Scientifically, these regions are called endorheic basins," said Jida Wang, a Kansas State University geographer and the study's lead author.
"Over the past few decades, we have seen increasing evidence of perturbations to the endorheic water balance," said Wang, an assistant professor of geography.
"This includes, for example, the desiccating Aral Sea, the depleting Arabian aquifer and the retreating Eurasian glaciers. This evidence motivated us to ask: Is the total water storage across the global endorheic system, about one-fifth of the continental surface, undergoing a net decline?"
Using gravity observations from NASA/German Aerospace Center's Gravity Recovery and Climate Experiment, or GRACE, satellites, Wang and his colleagues quantified a net water loss in global endorheic basins of approximately 100 billion tons of water per year since the start of the current millennium. This means a water mass equivalent to five Great Salt Lakes or three Lake Meads is gone every year from the arid endorheic regions.
Surprisingly, this amount of endorheic water loss is double the rate of concurrent water changes across the remaining landmass except Greenland and Antarctica, Wang said.
Opposite to endorheic basins, the remaining regions are exorheic, meaning streamflow originating from these basins drains to the ocean. Exorheic basins account for most of the continental surface and are home to many of the world's greatest rivers, such as the Nile, Amazon, Yangtze and Mississippi.
Wang noted that the signature of water storage changes in exorheic basins resembles some prominent oscillations of the climate system, such as El Niño and La Niña in multiyear cycles. However, the water loss in endorheic basins appears less responsive to such short-term natural variability.
This contrast may suggest a profound impact of longer-term climate conditions and direct human water management, such as river diversion, damming and groundwater withdrawal, on the water balance in the dry hinterlands.
This endorheic water loss has dual ramifications, according to the researchers. Not only does it aggravate water stress in the arid endorheic regions, but it could also contribute to a significant factor of global environmental concern: sea level rise.
Sea level rise is a result of two main causes: thermal expansion of sea water as a result of increased global temperature, and additional water mass to the ocean.
"The hydrosphere is mass conserved," said Chunqiao Song, researcher with the Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, and a co-lead author of the study.
"When water storage in endorheic basins is in deficit, the reduced water mass doesn't disappear. It was reallocated chiefly through vapor flux to the exorheic system. Once this water is no longer landlocked, it has the potential to affect the sea level budget."
Despite an observation period of 14 years, the endorheic water loss equals an additional sea level rise of 4 millimeters, the study found. The researchers said this impact is nontrivial. It accounts for approximately 10 percent of the observed sea level rise during the same period; compares to nearly half of the concurrent loss in mountain glaciers, excluding Greenland and Antarctica; and matches the entire contribution of global groundwater consumption.
"We are not saying the recent endorheic water loss has completely ended up in the ocean," said Yoshihide Wada, deputy director of the water program at the International Institute for Applied Systems Analysis in Austria and a co-author of the study. "Instead, we are showing a perspective of how substantial the recent endorheic water loss has been. If it persists, such as beyond the decadal timescale, the water surplus added to the exorheic system may signify an important source of sea level rise."
By synergizing multi-mission satellite observations and hydrological modeling, Wang and his colleagues attributed this global endorheic water loss to comparable contributions from the surface -- such as lakes, reservoirs and glaciers -- as well as soil moisture and aquifers.
"Such comparable losses are, however, an aggregation of distinct regional variations," Wang said. "In endorheic Central Eurasia, for instance, about half of the water loss came from the surface, particularly large terminal lakes such as the Aral Sea, the Caspian Sea and Lake Urmia, and retreating glaciers in High Mountain Asia."
While glacial retreat was a response to warming temperature, water losses in the terminal lakes were a combined result of meteorological droughts and long-term water diversions from the feeding rivers.
The net water loss in endorheic Sahara and Arabia, on the other hand, was dominated by unsustainable groundwater withdrawal, according to the researchers. In endorheic North America, including the Great Basin of the U.S., a drought-induced soil moisture loss was likely responsible for most of the regional water loss. Despite a lesser extent, the surface water loss in the Great Salt Lake and the Salton Sea was at a substantial rate of 300 million tons per year, which was partially induced by mineral mining and diversion-based irrigation.
"The water losses from the world's endorheic basins are yet another example of how climate change is further drying the already dry arid and semi-arid regions of the globe. Meanwhile, human activities such as groundwater depletion are significantly accelerating this drying," said Jay Famiglietti, director of the Global Institute of Water Security, Canada 150 research chair in hydrology and remote sensing at the University of Saskatchewan, Canada and co-author of the study.
Wang said the team wants to convey three takeaway messages from their research.
"First, water storage in the endorheic system, albeit limited in total mass, can dominate the water storage trend in the entire land surface during at least decadal timescales," Wang said. "Second, the recent endorheic water loss is less sensitive to natural variability of the climate system, suggesting a possible response to longer-term climate conditions and human water management.
"Third, such a water loss in the endorheic system has dual ramifications, both to regional water sustainability and to global sea level rise," he said. "These messages highlight the underrated importance of endorheic basins in the water cycle and the need for an improved understanding of water storage changes in the global hinterlands."
Along with Wang, Song, Wada and Famiglietti, the research team also includes John T. Reager from the Jet Propulsion Laboratory at the California Institute of Technology;Fangfang Yao, doctoral student in geography, and Richard Marston, university distinguished professor emeritus of geography, both from Kansas State University; Yongwei Sheng from the geography department, and Glen MacDonald, geography and the ecology and evolutionary biology departments, both at the University of California at Los Angeles; Fanny Brun from the University of Grenoble Alpes, Grenoble, France, and LEGOS in Toulouse, France; and Hannes Müller Schmied from the Institute of Physical Geography at Goethe University in Frankfurt,Germany, and Senckenberg Biodiversity and Climate Research Center in Germany.
This research was supported by Kansas State University faculty start-up fund, NASA Surface Water and Ocean Topography, or SWOT, Grant; China's Thousand Young Talents Program; and the NASA Sea Level Change team. A portion of this research was conducted at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.
Jida Wang | EurekAlert!
Saltier waterways are creating dangerous 'chemical cocktails'
03.12.2018 | University of Maryland
Quirky glacial behavior explained
30.11.2018 | University of Colorado at Boulder
Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.
The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.
Process engineers at Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) have developed a method which allows the size and shape of nanoparticles in dispersions to be determined considerably quicker than ever before. Based on gold nanorods, they demonstrated how length and diameter distributions can be measured accurately in just one step instead of the complicated series of electron microscopic images which have been needed up until now. Nanoparticles from precious metals are used, for example, as catalysts and contrast agents for diagnosing cancer. The results have been published in the renowned journal Nature Communications (doi: 10.1038/s41467-018-07366-9).
Even in the Middle Ages, gold particles were used to create vibrant red and blue colours, for example to illustrate biblical scenes in stained glass windows....
The experiments conducted from July until November at the Wendelstein 7-X fusion device at the Max Planck Institute for Plasma Physics (IPP) in Greifswald have achieved higher values for the density and the energy content of the plasma and long discharge times of up to 100 seconds – record results for devices of the stellarator type. Meanwhile, the next round of the step-by-step upgrading of Wendelstein 7-X has begun. It is to equip the device for greater heating power and longer discharges. Wendelstein 7-X, the world’s largest fusion device of the stellarator type, is to investigate the suitability of this configuration for use in a power plant.
During the course of the step-by-step upgrading of Wendelstein 7-X, the plasma vessel was fitted with inner cladding since September of last year.
Advances in environmental technology: You don’t need complex filters and laser systems to destroy persistent pollutants in water. Chemists at Martin Luther University Halle-Wittenberg (MLU) have developed a new process that works using mere sunlight. The process is so simple that it can even be conducted outdoors under the most basic conditions. The chemists present their research in the journal “Chemistry - a European Journal”.
The chemists at MLU rely on electrons moving freely in water, so-called hydrated electrons, to degrade dissolved pollutants.
The experimental investigation of ultracold quantum matter makes it possible to study quantum mechanical phenomena that are otherwise hardly accessible. A team led by the Innsbruck physicist Francesca Ferlaino has now succeeded for the first time in mixing quantum gases of the strongly magnetic elements Erbium and Dysprosium and creating a dipolar quantum mixture.
Only a few years ago it seemed unfeasible to extend the techniques of atom manipulation and deep cooling in the ultracold regime to many-valence-electron...
28.11.2018 | Event News
23.11.2018 | Event News
19.11.2018 | Event News
03.12.2018 | Earth Sciences
03.12.2018 | Physics and Astronomy
03.12.2018 | Physics and Astronomy