Climate change slowing down, not speeding up, movement of large Arctic rivers: study
They found migration rates of these rivers, rather than increasing, decreased overall by about 20 per cent between 1972 and 2020.“My reaction was ‘Oh boy, it’s going to be hard to convince people about this,’” lead author Alessandro Ielpi said of the findings.“It’s potentially a disruptive idea. It may potentially reshape the way we think about northern environments and the way they are adapting to the changing climate.
Ielpi, an assistant professor in the Department of Earth, Environmental and Geographic Sciences at the University of British Columbia Okanagan, said it has been “almost a core belief” among the scientific community that rising temperatures and permafrost thaw would speed up the rate that rivers change position.
Think about trying to dig a hole in the ground that is frozen. Of course, you’ll spend more energy and it’s going to be more demanding than digging or eroding soil that is not frozen,” he explained. “If the temperature goes up and the frozen ground is progressively melting, the reverse would have found less resistance to erosion.”Scientists have theories about why the migration of these rivers has instead slowed over the past five decades — chiefly Arctic greening.While increasing temperatures and moisture in the Arctic have resulted in permafrost thaw, they have also led to shrubification, where shrubs are growing thicker and taller in areas that were once barren or sparsely vegetated.
Ielpi said the increased vegetation is causing riverbanks to be more stable and less susceptible to erosion, and the plants are also reducing surface run-off by using water.
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