全球约五分之一海洋出现“变暗”现象

“Roughly one-fifth of the world’s oceans have darkened in some way” Less light is penetrating the ocean’s surface all over the planet, reshaping ecosystems. Oceanographer Tim Smyth tells Thomas Lewton what we know about this ocean “darkening” and why there is still hope we can reverse it A T DUSK, the greatest migration of biomass on Earth unfolds through the oceans in near silence, largely unnoticed. Trillions of often tiny creatures – zooplankton, krill, lanternfish – rise from the depths, drawn by blooms of phytoplankton in the uppermost layers of water. They feast through the night, safe from predators that hunt by sight, then retreat as the sun rises. …