雾，研究中的“弱者”，获得严肃关注

California effort will study the future of a vital water source in a warming world HANNAH RICHTER E ach summer in California’s Central Valley, the land bakes as temperatures climb past an oppressive 35°C. And then, a wall of fog rolls in from the ocean, cooling the air and moistening the ground with tiny water droplets. For millions living in the most populous U.S. state, the fog spawned where a cold ocean meets a Sun- warmed coast is like “natural air conditioning,” says Peter Weiss- Penzias, an atmospheric chemist at the University of California (UC), Santa Cruz. It also delivers critical water for agriculture and ecosystems. …