HQ Team
May 20, 2023: Half of the world’s largest lakes are losing water due to a warming climate, unsustainable human consumption, and sedimentation, a global study revealed.
“This is the first comprehensive assessment of trends and drivers of global lake water storage variability based on an array of satellites and models,” said lead author Fangfang Yao, a CIRES visiting fellow, now a climate fellow at the University of Virginia.
Freshwater lakes and reservoirs store 87% 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.
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.”
Two billion people
The authors estimate roughly one-quarter of the world’s population, two 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.
The researchers were motivated by environmental crises in some of the earth’s largest water bodies, such as the drying of the Aral Sea between Kazakhstan and Uzbekistan.
Yao and his 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% 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, according to an article published in Science.
The group used 250,000 lake-area snapshots captured by satellites between 1992-2020 to survey the area of 1,972 of Earth’s biggest lakes.
Satellite data
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% of lakes globally experienced a decline in water storage. The authors compared this loss with the magnitude of 17 Lake Meads, the largest reservoir in the United States.
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.”
Significant water loss
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. I
In long-established reservoirs—those that filled before 1992—sedimentation was more important than droughts and heavy rainfall years.
According to the study, while the majority of global lakes were shrinking, 24% 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.
‘Not bleak’
Yao 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, he said.
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.
“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,” Livneh said.
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 2000.
