Science, Space and Technology News 2024
Climate change is disrupting the natural seasonality of river flows in northern regions, posing significant threats to ecosystems and water security, with human-induced climate change identified as the primary cause. Credit: SciTechDaily.com
The study used data-based reconstructions and state-of-the-art simulations to show that river flow is now far less likely to vary with the seasons in latitudes above 50°N than previously, and that this could be directly linked to changes to the climate caused by human activity. For the first time ever, they were able to exclude direct human interventions such as reservoir management or water extraction, to show that widespread reduction in river flow seasonality was driven by climate change.
Over two-thirds of the world’s rivers have already been altered by humans even without considering the indirect impacts of increases in greenhouse gases and aerosols. There was a comparable pattern in Europe, with 19% of the river gauging stations experiencing a significant decrease – mainly in northern Europe, western Russia, and the European Alps.
By contrast, the researchers found a significant increase in river flow seasonality in 25% of the gauging stations in southeast Brazil, showing that changes to the water cycle are having a different impact in some parts of the world.eeds, co-authored the research. She said: “The highs and lows of river flow during the different seasons provide vital cues for the“For example, a lot of fish use particular increases in the water as a cue to run to their breeding areas upstream or towards the sea.
France Dernières Nouvelles, France Actualités
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