First Simultaneous Lidar Observations of Thermosphere-Ionosphere Sporadic Ni and Na (TISNi and TISNa) Layers (∼105–120 km) Over Beijing (40.42°N, 116.02°E)

Wu, Fuju; Chu, Xinzhao; Du, Lina; Jiao, Jing; Zheng, Huinan; Xu, Jiyao; Feng, Wuhu; Plane, J. M. C.; Yang, Guotao

doi:10.5194/egusphere-egu23-16212

Cited by 1 publication

(2 citation statements)

References 28 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fe resonance fluorescence lidar systems used in this work were built by Chinese Meridian Project Phase II [2,32,33]. Both the Beijing and Mohe stations were configured using the same laser emission system which can generate a laser with a wavelength of 371.9937 nm in air.…”

Section: Lidar Systemmentioning

confidence: 99%

“…The mesosphere and lower thermosphere (MLT) is the region of the atmosphere from 50 to 120 km above the Earth's surface. Meteors and extraterrestrial dust are injected into the Earth's atmosphere and then ionize, ablate or sputter to produce metal vapors that form metal layers covering the global atmosphere in the MLT [1,2]. The metal layers are composed of various species of metal atoms, ions and oxides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lidar Observations of the Fe Layer in the Mesopause and Lower Thermosphere over Beijing (40.5° N, 116.0° E) and Mohe (53.5° N, 122.4° E)

Wang,

et al. 2024

Atmosphere

View full text Add to dashboard Cite

Lidar observations of metal layers play a significant role in research on the chemistry and dynamics of the mesosphere and lower thermosphere. This work reports on Fe lidar observations conducted in Beijing and Mohe. Utilizing the same laser emission system, a 1064 nm seed laser was injected into an Nd: YAG laser to generate a single longitudinal-mode pulse 532 nm laser, which pumped a dye laser to produce a 572 nm laser. The 572 nm laser and the remaining 1064 nm fundamental frequency laser passed through a sum–frequency module to generate a 372 nm laser to detect the Fe layer. According to a total of 52.6 h of observations for 10 nights in Beijing, the Fe layer has an average column density of 1.24 × 1010 cm−2, an RMS width of 4.4 km and a centroid altitude of 89.4 km. In Mohe, observed for 16 nights and a total of 91.5 h, the Fe layer has an average column density of 1.08 × 1010 cm−2, an RMS width of 4.6 km and a centroid altitude of 89.5 km. The probability of the occurrence of sporadic Fe layers was 42.4% in Beijing and 29.4% in Mohe. Compared to simultaneously observed Na layers, the occurrence probabilities of sporadic Fe layers were higher than those of sporadic Na layers in both stations. Based on the two cases observed in Beijing, it is conjectured that the formation mechanism of sporadic metal layers above approximately 100 km has a more significant influence on sporadic Fe layers than on sporadic Na layers. The lower thermospheric Fe layers with densities significantly larger than those of the main layer were observed during two nights in Mohe. This work contributes to the refinement of the global distribution of Fe layers and provides abundant observational data for the modeling and study of the metal layers.

show abstract

Section: Lidar Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%