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Drying Lakes Emit Carbon: A Climate Tipping Point?
17 Jul
Summary
- Drying lakes are releasing significant amounts of stored carbon into the atmosphere.
- The Aral Sea alone emitted 748 million metric tons of carbon dioxide since 1960.
- Protecting remaining lake carbon offers a potential climate change reversal opportunity.
Researchers are raising concerns that emissions from drying lakes, such as the Aral Sea, could indicate a critical climate tipping point.
The Aral Sea, once a massive inland body of water, has shrunk dramatically due to irrigation. New research reveals that its evaporation has released an estimated 748 million metric tons of carbon dioxide into the atmosphere between 1960 and 2022.
This phenomenon, termed "dry flux," occurs as stored carbon in lake sediments is exposed and released. Wind blowing sediment also contributes significantly to these emissions, a factor previously understudied.
The study highlights that other lakes globally, including Lake Chad and the Great Salt Lake, are exhibiting similar "dry flux" emissions, adding a substantial "blind spot" to climate change calculations.
While these emissions are alarming, scientists see a unique opportunity. Protecting the approximately 605 million metric tons of carbon dioxide still stored in the Aral Sea's lakebed could provide a pathway to mitigating climate change and reversing current trends.
Addressing this issue requires innovative solutions, potentially involving carbon credits, to incentivize preserving the carbon stored in these drying lakebeds and other water bodies worldwide.
