太平洋上的航迹
(原标题: Ship Tracks over the Pacific Ocean)
2022-06-08
浏览次数: 16
那些不寻常的条纹是什么？地球上的一些照片显示，随着船只的轨迹，有清晰明亮的条纹。这些低而窄的波段被称为船舶轨迹，是由船舶的发动机废气造成的。水蒸气在被称为气溶胶的小颗粒废气周围凝结，这些气溶胶很快就会变成漂浮的水滴，有效地反射阳光。1965年，在美国宇航局的TIROS卫星拍摄的地球图像中首次发现了船只的踪迹。在这张2009年由美国国家航空航天局Terra卫星上的MODIS仪器在太平洋上空拍摄的特色图像中，可以看到多条船迹。受航迹的启发，一些科学家建议在世界海洋中部署一个漂浮的浮标网络，向空气中喷洒含有海水的盐气溶胶，这样在风的帮助下，反射阳光的云流也会形成。为什么要这样做？这些人造云可以反射大量的阳光，它们可能有助于对抗全球变暖。今天是世界海洋日
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What are those unusual streaks? Some images of planet Earth show clear bright streaks that follow the paths of ships. Known as ship tracks, these low and narrow bands are caused by the ship's engine exhaust. Water vapor condenses around small bits of exhaust known as aerosols, which soon grow into floating water drops that efficiently reflect sunlight. Ship tracks were first discovered in 1965 in Earth images taken by NASA's TIROS satellites. Multiple ship tracks are visible across the featured image that was captured in 2009 over the Pacific Ocean by the MODIS instrument on NASA's Terra satellite. Inspired by ship-tracks, some scientists have suggested deploying a network of floating buoys in the worlds' oceans that spray salt-aerosol containing sea-water into the air so that, with the help of the wind, streams of sunlight-reflecting clouds would also form. Why do this? These human-made clouds could reflect so much sunlight they might help fight global warming. Today is: World Oceans Day