Lidar observation campaigns on diurnal variations of the sodium layer in Beijing and Wuhan, China

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• 作者：ShaoHua Gong ; GuoTao Yang ; XueWu Cheng ; ShunSheng Gong…
• 关键词：daytime lidar ; diurnal variations of the sodium layer ; photochemistry effects ; tidal perturbations
• 刊名：Science China Earth Sciences
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：58
• 期：8
• 页码：1377-1386
• 全文大小：2,161 KB
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• 作者单位：ShaoHua Gong (1) (2)
  GuoTao Yang (2)
  XueWu Cheng (3)
  ShunSheng Gong (3)
  JiYao Xu (2)
  FaQuan Li (3)
  Wei Gong (4)
  JiHong Wang (2)
  
  1. School of Physics and Electronics Engineering, Hainan Normal University, Haikou, 571158, China
  2. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, 100190, China
  3. Laboratory of Optoelectronics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430072, China
  4. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430072, China
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1897

文摘

Based on observations from daytime lidars in eastern China, diurnal cycles of the sodium layer over Wuhan (30.5°N, 114.6°E) and Beijing (40.5°N, 116°E) are investigated. Diurnal variations of Na density, root mean square (RMS) layer width, and centroid height of the sodium layer are analyzed. Results reveal that the large diurnal cycles of the sodium layer are controlled mainly by 24-hr oscillations at the two observation sites. The diurnal variation of the sodium layer over Wuhan was modulated mainly by tidal perturbations during the lidar observation campaign. Conversely, the diurnal variation over Beijing was controlled principally by photoionization and photochemistry effects during another campaign, and there was little evidence of direct tidal perturbations. These comparisons suggest that the diurnal variation of the sodium layer perhaps has obvious regional characteristics across China. The variation can be either controlled mainly by tidal perturbations or by photoionization and photochemistry effects in different seasons.