科学素养与生活应用·英语30篇（4）
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Why Certain Clouds Glow Bright Green at Night
为何某些云层在夜间发出明亮的绿光
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Noctilucent clouds form high in the mesosphere, about 80–85 km above Earth’s surface.夜光云形成于距地表约80–85公里的中间层高空。
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They glow because tiny ice crystals scatter sunlight from below the horizon at twilight.它们在暮色中发光，是因为微小的冰晶散射了地平线以下的阳光。
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Their greenish hue comes from excited oxygen atoms emitting light during chemical reactions.其青绿色调源于化学反应中受激氧原子发出的光。
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These clouds only appear near polar regions during summer months due to cold temperatures.这些云仅在夏季极地附近因低温而出现。
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Scientists monitor them using satellites and ground-based lidar instruments worldwide.科学家通过全球卫星和地面激光雷达设备监测它们。
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An increase in their frequency may signal changes in upper-atmosphere water vapor or temperature.其出现频率增加可能预示着高层大气水汽或温度的变化。
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Methane emissions indirectly boost noctilucent cloud formation through oxidation chemistry.甲烷排放通过氧化反应间接促进夜光云的形成。
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Amateur astronomers often photograph them using DSLR cameras with long exposures.业余天文学家常用单反相机长时间曝光拍摄它们。
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They serve as natural indicators of atmospheric dynamics and climate-linked processes.它们是大气动力学及气候相关过程的天然指示器。
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Studying them helps improve models of Earth’s entire atmospheric system.研究它们有助于改进地球整体大气系统的模型。