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Open AccessArticle

Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China

1
State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2
Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
3
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
4
University of Chinese Academy of Science, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 118; https://doi.org/10.3390/atmos11010118
Received: 21 November 2019 / Revised: 15 January 2020 / Accepted: 17 January 2020 / Published: 20 January 2020
Based on application of the atomic filter technology in a signal detection system of lidar, the diurnal observation of sodium lidar were obtained using the system at the National Space Science Center of the Chinese Academy of Sciences at Beijing Yanqing station (40.5° N, 116° E) in April 2014. During the lidar observation period, among the 103 cases of continuous daytime observations, the longest time was 181 h. In the case of a continuous observation period of 5 days (13–18 October 2014), the signal-to-noise ratio reached to 19:1 at 12:00–13:00 Local Time of the daytime, when the spatial and time resolutions were respectively set to 96 m of 167 s. The improvements resulted in the highest detection level of any existing diurnal lidars in China. Some interesting phenomena such as the sporadic sodium layer have also been observed during the daytime. The daytime capability extended the observing time range of the earlier systems that were limited to only nighttime observations. This innovation provides a useful method for the studies of diurnal tides, photochemistry, gravity waves, and correlative modeling studies. View Full-Text
Keywords: sodium fluorescent lidar; daytime observation; atomic resonance filter technique; sporadic sodium layer; continuous diurnal observation sodium fluorescent lidar; daytime observation; atomic resonance filter technique; sporadic sodium layer; continuous diurnal observation
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Du, L.; Wang, J.; Yang, Y.; Xun, Y.; Li, F.; Wu, F.; Gong, S.; Zheng, H.; Cheng, X.; Yang, G.; Lu, Z. Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China. Atmosphere 2020, 11, 118.

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