永利游戏登录:Biggest sand dunes set to grow as Earth warms

 作者:庾唇     |      日期:2019-03-09 05:14:02
AT 500 metres tall, Earth’s largest sand dunes are already monsters – yet they are set to grow bigger as the world warms. Giant sand dunes are thought to form when smaller dunes crash into each other and pile up. To investigate if anything limits their size, Bruno Andreotti at the Denis Diderot University, Paris, and colleagues calculated what the atmospheric flow looks like around giant dunes. They found that the thickness of the lowest layer of the atmosphere – the boundary layer – controls dune size, with a thicker layer leading to larger dunes (Nature, vol 457,