Scientists have long believed that rapid warming in the Arctic would cause river channels to move faster, but a new study has found the opposite may be true for large, winding rivers in the region.
The paper, published in the scientific journal Nature and Climate Change, details how an international team of researchers tested this theory by analyzing satellite imagery of rivers in Alaska, Yukon and the Northwest Territories over time.They found migration rates of these rivers, rather than increasing, decreased overall by about 20 per cent between 1972 and 2020.
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.
Scientists have theories about why migration of these rivers has instead slowed over the past five decades -- chiefly Arctic greening. The study focuses on 10 sinuous rivers wider than 100 metres in permafrost terrain, including the Mackenzie, Porcupine, and Yukon rivers. Its authors caution the findings may not apply to smaller streams in upland catchments, as they may respond differently to increasing temperatures.
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