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US Southwest could be heading for a megadrought

发布时间:2019-02-26 10:15:10来源:未知点击:

By Ivan Semeniuk in Tucson, Arizona IS THE American Southwest heading for a megadrought? A projection based on climate models suggests this could be the outcome as global warming alters the Pacific weather patterns that normally bring rain to the region (Science, vol 316, p 1181). Now tree rings are revealing just how dry things could get. In a warren of rooms wedged under the University of Arizona’s football stadium, the Laboratory of Tree-Ring Research conjures up the past in more ways than one. It was here, in 1937,