用激光雷达探测合肥高空钠层的变化
Atmospheric sodium measurement at Hefei by lidar
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摘要: 介绍了自行设计的钠共振荧光激光雷达系统，并对钠层密度、钠层柱密度、中心高度及均方根宽度进行了计算和分析。计算结果表明:从2005年12月到2006年3月合肥上空钠层变化显著，钠层柱密度从12月平均值5.4×109cm-2变化到3月平均值2.4×109cm-2，下降了50%以上。均方根宽度也下降，中心高度略有波动。合肥钠层的变化趋势与中纬度其它地区具有可比性。Abstract: Sodium resonance fluorescence lidar was used to detect sodium layer at Hefei. The configuration of sodium resonance fluorescence lidar was introduced. The measurement data have been retrieved and analyzed. The results show that the density of sodium varied much during Dec.2005 to Mar.2006: The column abundance of sodium layer changed from 5.4×109cm-2 to 2.4×109cm-2, reduced almost 50%; The mean RMS width also declined, and the centroid height of sodium layer had small fluctuation. The variation trend of sodium layer at Hefei is similar to those in the other mid-latitude places (such as Illinois, Tokyo) in the world.
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Key words:
- lidar /
- resonance fluorescence /
- sodium density /
- column abundance
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