scholarly journals Rayleigh Lidar Observations and Comparisons with TIMED/SABER of Typical Case Studies in Beijing (40.5° N, 116.2° E), China

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1237
Author(s):  
Xu Zou ◽  
Guotao Yang ◽  
Linxiang Chen ◽  
Jihong Wang ◽  
Lifang Du
Keyword(s):  
Layer Thickness ◽  
North China ◽  
Middle Atmosphere ◽  
Temperature Inversion ◽  
Seasonal Distribution ◽  
Typical Case ◽  
Rayleigh Lidar ◽  
Beijing China ◽  
Lidar Observations ◽  
Average Layer Thickness

Based on 139 nights of observational data of the Rayleigh lidar site in Beijing, China (40.5° N, 116.2° E), typical lower MIL cases and their temperature inversion evolution process were reported and compared with the SABER data from the same time. Meanwhile, the seasonal distribution of lower MIL cases over North China was also statistically analyzed. The average inversion temperature of the low MIL is 23.4 K, and the average layer thickness is 4.78 km with an average MIL bottom altitude of 68.2 km. Meanwhile, 65% of the MIL propagates vertically, most of which goes downward. These results show the temperature behavior properties of the lower MIL over North China, which may be helpful for us to further understand middle atmosphere chemical and dynamics processes.

scholarly journals Statistical analysis of the mesospheric inversion layers over two symmetrical tropical sites: Réunion (20.8° S, 55.5° E) and Mauna Loa (19.5° N, 155.6° W)

2017 ◽  
Vol 35 (6) ◽  
pp. 1177-1194 ◽  
Author(s):  
Nelson Bègue ◽  
Nkanyiso Mbatha ◽  
Hassan Bencherif ◽  
René Tato Loua ◽  
Venkataraman Sivakumar ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Mean Amplitude ◽  
Temperature Inversion ◽  
Tropical Region ◽  
Height Range ◽  
Tropical Regions ◽  
Mauna Loa ◽  
Annual Component ◽  
Rayleigh Lidar ◽  
Lidar Observations

Abstract. In this investigation a statistical analysis of the characteristics of mesospheric inversion layers (MILs) over tropical regions is presented. This study involves the analysis of 16 years of lidar observations recorded at Réunion (20.8° S, 55.5° E) and 21 years of lidar observations recorded at Mauna Loa (19.5° N, 155.6° W) together with SABER observations at these two locations. MILs appear in 10 and 9.3 % of the observed temperature profiles recorded by Rayleigh lidar at Réunion and Mauna Loa, respectively. The parameters defining MILs show a semi-annual cycle over the two selected sites with maxima occurring near the equinoxes and minima occurring during the solstices. Over both sites, the maximum mean amplitude is observed in April and October, and this corresponds to a value greater than 35 K. According to lidar observations, the maximum and minimum mean of the base height ranged from 79 to 80.5 km and from 76 to 77.5 km, respectively. The MILs at Réunion appear on average ∼ 1 km thinner and ∼ 1 km lower, with an amplitude of ∼ 2 K higher than Mauna Loa. Generally, the statistical results for these two tropical locations as presented in this investigation are in fairly good agreement with previous studies. When compared to lidar measurements, on average SABER observations show MILs with greater amplitude, thickness and base altitudes of 4 K, 0.75 and 1.1 km, respectively. Taking into account the temperature error by SABER in the mesosphere, it can therefore be concluded that the measurements obtained from lidar and SABER observations are in significant agreement. The frequency spectrum analysis based on the lidar profiles and the 60-day averaged profile from SABER confirms the presence of the semi-annual oscillation where the magnitude maximum is found to coincide with the height range of the temperature inversion zone. This connection between increases in the semi-annual component close to the inversion zone is in agreement with most previously reported studies over tropics based on satellite observations. Results presented in this study confirm through the use of the ground-based Rayleigh lidar at Réunion and Mauna Loa that the semi-annual oscillation contributes to the formation of MILs over the tropical region.

Rayleigh lidar observations of quasi-sinusoidal waves in the tropical middle atmosphere

2003 ◽  
Vol 108 (D24) ◽  
pp. n/a-n/a ◽  
Author(s):  
K. Rajeev ◽  
K. Parameswaran ◽  
M. N. Sasi ◽  
Geetha Ramkumar ◽  
B. V. Krishna Murthy
Keyword(s):  
Middle Atmosphere ◽  
Rayleigh Lidar ◽  
Lidar Observations

Rayleigh lidar observations of gravity wave characteristics in the middle atmosphere at Gadanki, India (13.5 degrees N, 79.2 degreesE.)

2002 ◽  
Author(s):  
K. Parameswaran ◽  
K. Rajeev ◽  
M. N. Sasi ◽  
Geetha Ramkumar ◽  
B. V. Krishna Murthy ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Middle Atmosphere ◽  
Wave Characteristics ◽  
Rayleigh Lidar ◽  
Lidar Observations

Rayleigh lidar observations of planetary waves in the middle atmosphere over Gadanki (13.5°N, 79.2°E)

2006 ◽  
Vol 68 (8) ◽  
pp. 901-910 ◽  
Author(s):  
P. Kishore ◽  
S.P. Namboothiri ◽  
K. Igarashi ◽  
V. Sivakumar ◽  
S. Thulasiraman ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Planetary Waves ◽  
Rayleigh Lidar ◽  
Lidar Observations

scholarly journals Middle atmosphere temperature trend and solar cycle revealed by long-term Rayleigh lidar observations

2011 ◽  
Vol 116 ◽  
Author(s):  
Tao Li ◽  
Thierry Leblanc ◽  
I. Stuart McDermid ◽  
Philippe Keckhut ◽  
Alain Hauchecorne ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Middle Atmosphere ◽  
Temperature Trend ◽  
Atmosphere Temperature ◽  
Rayleigh Lidar ◽  
Lidar Observations

Gravity waves in the middle atmosphere observed by Rayleigh lidar: 2. Climatology

1991 ◽  
Vol 96 (D3) ◽  
pp. 5169 ◽  
Author(s):  
R. Wilson ◽  
M. L. Chanin ◽  
A. Hauchecorne
Keyword(s):  
Gravity Waves ◽  
Middle Atmosphere ◽  
Rayleigh Lidar

scholarly journals 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America

2019 ◽  
Vol 124 (2) ◽  
pp. 451-467 ◽  
Author(s):  
P. Llamedo ◽  
J. Salvador ◽  
A. Torre ◽  
J. Quiroga ◽  
P. Alexander ◽  
...  
Keyword(s):  
South America ◽  
Gravity Wave ◽  
Wave Activity ◽  
Rayleigh Lidar ◽  
Lidar Observations

scholarly journals Recent Dynamic Studies on the Middle Atmosphere at Mid- and Low-Latitudes Using Rayleigh Lidar and Other Technologies

2018 ◽  
pp. 757-776
Author(s):  
Alain Hauchecorne ◽  
Sergey Khaykin ◽  
Philippe Keckhut ◽  
Nahoudha Mzé ◽  
Guillaume Angot ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Dynamic Studies ◽  
Low Latitudes ◽  
Rayleigh Lidar

scholarly journals Long-term Lidar Observations of the Gravity Wave Activity near the Mesopause at Arecibo

2018 ◽  
Author(s):  
Xianchang Yue ◽  
Jonathan S. Friedman ◽  
Qihou Zhou ◽  
Xiongbin Wu ◽  
Jens Lautenbach
Keyword(s):  
Potential Energy ◽  
Gravity Wave ◽  
Inversion Layer ◽  
Lower Thermosphere ◽  
Temperature Inversion ◽  
Temperature Structure ◽  
Mean Temperature ◽  
The Mean ◽  
Highly Correlated ◽  
Lidar Observations

Abstract. 11-years long K Doppler lidar observations of temperature profiles in the mesosphere and lower thermosphere (MLT) between 85 and 100 km, conducted at the Arecibo Observatory, Puerto Rico (18.35° N, 66.75° W), are used to estimate seasonal variations of the mean temperature, the squared Brunt-Väisälä frequency, and the gravity wave potential energy in a composite year. The following unique features are obtained: (1) The mean temperature structure shows similar characteristics as a prior report based on a smaller dataset: (2) The profiles of the squared Brunt-Väisälä frequency usually reach the maxima at or just below the temperature inversion layer when that layer is present. The first complete range-resolved climatology of potential energy of temperature fluctuations in the tropical MLT exhibits an altitude dependent combination of annual oscillation (AO) and semiannual oscillation (SAO). Between 88 to 96 km altitude, the amplitudes of AO and SAO are comparable, and their phases are almost the same and quite close to day of year (DOY) 100. Below 88 km, the SAO amplitude is significantly larger than AO and the AO phase shifts to DOY 200 and after. At 97 to 98 km altitude, the amplitudes of AO and SAO reach their minima, and both phases shift significantly. Above that, the AO amplitude becomes greater. The annual mean potential energy profile reaches the minimum at 91 to 92 km altitude. The altitude-dependent SAO of the potential energy is found to be highly correlated with the satellite observed mean zonal winds reported in the literature.

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