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.
"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," Wang said. "This includes, for example, the desiccating Aral Sea, the depleting Arabian aquifer and the retreating Tibetan 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 of 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 sensitive 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, 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 this study. "When water storage in endorheic basins is in deficit, the reduced water mass doesn't disappear. It was reallocated through vapor flux to the exorheic system. Once this water is no longer landlocked, it has a 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," Wang said. "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, most 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. 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 and Canada 150 Research Chair in Hydrology and Remote Sensing at the University of Saskatchewan, Canada..
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 and Famiglietti, this 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; Hannes Müller Schmied from the Institute of Physical Geography at Goethe University in Frankfurt, Germany, and Senckenberg Biodiversity and Climate Research Center in Germany; and Yoshihide Wada from the International Institute for Applied Systems Analysis in Laxenburg, Austria.
This research was supported by Kansas State University faculty start-up fund, NASA Surface Water and Ocean Topography (SWOT) Grant, China’s Thousand Young Talents Program, and the NASA Sea Level Change team. A portion for this research was conducted at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.