Half of world's largest lakes losing water
Climate change, human consumption and sedimentation contributing to decline
Peer-Reviewed PublicationIMAGE: LOOKING NORTHEAST, THE IMPERIAL VALLEY AND SALTON SEA IN SOUTHERN CALIFORNIA IS PHOTOGRAPHED FROM THE EARTH-ORBITING GEMINI-5 SPACECRAFT. PHOTO CREDIT: NASA. view more
CREDIT: PHOTO CREDIT: NASA
More than 50 percent of the largest lakes in the world are losing water, according to a groundbreaking new assessment published today in Science . The key culprits are not surprising: warming climate and unsustainable human consumption.
But lead author Fangfang Yao, a CIRES visiting fellow, now a climate fellow at University of Virginia, said the news is not entirely bleak. With this new method of tracking lake water storage trends and the reasons behind them, scientists can give water managers and communities insight into how to better protect critical sources of water and important regional ecosystems.
“This is the first comprehensive assessment of trends and drivers of global lake water storage variability based on an array of satellites and models,” Yao said.
He was motivated to do the research by the environmental crises in some of Earth's largest water bodies, such as the drying of the Aral Sea between Kazakhstan and Uzbekistan.
So he and colleagues from the University of Colorado Boulder, Kansas State University, France, and Saudi Arabia created a technique to measure changes in water levels in nearly 2,000 of the world’s biggest lakes and reservoirs, which represent 95 percent of the total lake water storage on Earth.
The team combined three decades of observations from an array of satellites with models to quantify and attribute trends in lake storage globally.
Globally, freshwater lakes and reservoirs store 87 percent of the planet's water, making them a valuable resource for both human and Earth ecosystems. Unlike rivers, lakes are not well monitored, yet they provide water for a large part of humanity – even more than rivers.
But despite their value, long-term trends and changes to water levels have been largely unknown – until now.
“We have pretty good information on iconic lakes like Caspian Sea, Aral Sea and Salton Sea, but if you want to say something on a global scale, you need reliable estimates of lake levels and volume,” said Balaji Rajagopalan, a CIRES fellow, professor of engineering at CU Boulder, and co-author. “With this novel method …we are able to provide insights into global lake level changes with a broader perspective.”
For the new paper, the team used 250,000 lake-area snapshots captured by satellites between 1992-2020 to survey the area of 1,972 of Earth’s biggest lakes. They collected water levels from nine satellite altimeters and used long-term water levels to reduce any uncertainty. For lakes without a long-term level record, they used recent water measurements made by newer instruments on satellites. Combining recent level measurements with longer-term area measurements allowed scientists to reconstruct the volume of lakes dating back decades.
The results were staggering: 53 percent of lakes globally experienced a decline in water storage. The authors compare this loss with the magnitude of 17 Lake Meads, the largest reservoir in the United States.
To explain the trends in natural lakes, the team leveraged recent advancements in water use and climate modeling. Climate change and human water consumption dominated the global net decline in natural lake volume and water losses in about 100 large lakes, Yao said. “And many of the human and climate change footprints on lake water losses were previously unknown, such as the desiccations of Lake Good-e-Zareh in Afghanistan and Lake Mar Chiquita in Argentina.”
Lakes in both dry and wet areas of the world are losing volume. The losses in humid tropical lakes and Arctic lakes indicate more widespread drying trends than previously understood.
Yao and his colleagues also assessed storage trends in reservoirs. They found that nearly two-thirds of Earth’s large reservoirs experienced significant water losses.
“Sedimentation dominated the global storage decline in existing reservoirs,” said Ben Livneh, also a co-author, CIRES fellow, and associate professor of engineering at CU Boulder. In long-established reservoirs—those that filled before 1992—sedimentation was more important than droughts and heavy rainfall years.
While the majority of global lakes are shrinking, 24 percent saw significant increases in water storage. Growing lakes tend to be in underpopulated areas in the inner Tibetan Plateau and Northern Great Plains of North America and in areas with new reservoirs such as the Yangtze, Mekong, and Nile river basins.
The authors estimate roughly one-quarter of the world’s population, 2 billion people, resides in the basin of a drying lake, indicating an urgent need to incorporate human consumption, climate change, and sedimentation impacts into sustainable water resources management.
And their research offers insight into possible solutions, Livneh said. “If human consumption is a large factor in lake water storage decline, then we can adapt and explore new policies to reduce large-scale declines.”
This happened in one of the lakes the team studied, Lake Sevan in Armenia. Lake Sevan has seen an increase in water storage, in the last 20 years, which the authors linked to enforcement of conservation laws on water withdrawal since the early 2000s.
For an interactive map illustrating the findings, click here.
JOURNAL
Science
METHOD OF RESEARCH
Imaging analysis
SUBJECT OF RESEARCH
Not applicable
ARTICLE TITLE
Satellites reveal widespread decline in global lake water storage
ARTICLE PUBLICATION DATE
18-May-2023
Global analysis reveals widespread decline in lake water storage worldwide
Peer-Reviewed PublicationThe amount of water stored in more than half of the largest lakes and reservoirs worldwide is declining, according to a new study. This drying is largely attributable to a warming climate and increased human impacts. The findings underscore the importance of accounting for these impacts in future surface water resources management strategies. Although they cover roughly 3% of the global land area, lakes hold 87% of Earth’s liquid surface fresh water. These features also provide essential ecosystem services and are key components in global biogeochemical processes. Many of these benefits are modulated by lake water storage (LWS), which can naturally fluctuate in response to local precipitation. However, direct human activities, like damming and water consumption, as well as ongoing climate change, increasingly threaten these crucial water resources. While it’s well known that the amount of water stored in some of the world’s largest lakes and human-managed reservoirs has progressively declined over recent years, the drivers behind these losses – particularly those related to human impacts and climate change – are poorly understood at the global scale. Combining global satellite measurements with climate and hydrologic models, Fangfang Yao et al. built a global dataset of decadal-scale trends in LWS from 1992 to 2020 for nearly 2,000 of the world’s largest lakes and reservoirs. Through their analysis, Yao et al. revealed a widespread decline in global LWS; according to the findings, 53% of these water bodies have experienced significant water losses over the last 28 years at a rate of roughly 22 gigatonnes (Gt) per year. The authors attribute much of the net volume loss in natural lakes to climate warming, increased evapotranspiration, and human water consumption, while sedimentation is to blame for storage loss in drying reservoirs. Yao et al. argue that the findings underscore the need for incorporating climate change and sedimentation impacts into sustainable water resources management. “Yao et al. estimated that nearly one-quarter of the world’s population lives in a basin with a large, drying lake,“ writes Sarah Cooley in a related Perspective. “Considering the importance of these lakes for ecosystem services, water supply, irrigation, and/or hydropower, the potential consequences of lake drying are both locally and globally important.”
JOURNAL
Science
ARTICLE TITLE
Satellites reveal widespread decline in global lake water storage
ARTICLE PUBLICATION DATE
19-May-2023
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