More than 50 percent of the largest lakes in the world are losing water, according to a new assessment published in Science. The key villains are not surprising: warming climate and unsustainable human consumption.
“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.
A climate fellow at University of Virginia, he 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 added.
Yao 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. These water bodies 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 BalajiRajagopalan, 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 researchers found that 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. 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 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.
While the majority of global lakes are shrinking, 24 percent saw significant increases in water storage. Growing lakes tend to be in under populated 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 that roughly one-quarter of the world’s population, 2 billion people, resides in the basin of a drying lake. This indicates an urgent need to incorporate human consumption, climate change, and sedimentation impacts into sustainable water resources management.
In addition, 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.