Removal of Meteoric Iron on Polar Mesospheric Clouds
Removal of Meteoric Iron on Polar Mesospheric Clouds
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DOI：
10.1126/science.1093236
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发表时间：
2004-04
期刊：
影响因子：
56.9
通讯作者：
J. Plane;B. Murray;X. Chu;C. Gardner
中科院分区：
文献类型：
--
作者：
J. Plane;B. Murray;X. Chu;C. Gardner
极地中间层云是由纳米大小的冰粒组成的薄层，出现在高纬度夏季中间层海拔82至87公里之间。这些云在高度上与进入大气层的流星体烧蚀产生的铁原子层重叠。仲夏在南极用激光雷达对铁层和云层的同时观测表明，铁原子基本上可以在云层中完全去除。室内实验和大气模拟表明，这种现象可以用冰粒子表面对铁的有效吸收来解释。
Polar mesospheric clouds are thin layers of nanometer-sized ice particles that occur at altitudes between 82 and 87 kilometers in the high-latitude summer mesosphere. These clouds overlap in altitude with the layer of iron (Fe) atoms that is produced by the ablation of meteoroids entering the atmosphere. Simultaneous observations of the Fe layer and the clouds, made by lidar during midsummer at the South Pole, demonstrate that essentially complete removal of Fe atoms can occur inside the clouds. Laboratory experiments and atmospheric modeling show that this phenomenon is explained by the efficient uptake of Fe on the ice particle surface.