Mesospheric temperatures estimated from the meteor radar observations at Mohe, China

Liu, Libo; Liu, Huixin; Le, Huijun; Chen, Yiding; Sun, Yihe; Ning, Baiqi; Hu, Lianhuan; Wan, Weixing; Li, Na; Xiong, Juan

doi:10.1002/2016ja023776

Cited by 24 publications

(18 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Davis meteor radar is located just within this region. We note that we also find a similar response for densities determined using the Nippon/Norway Tromsø meteor radar [see, e.g., Hall et al ., ; Holmen et al ., ] (69.6°N, 19.2°E; magnetic latitude, 66.73°N) in the Arctic, but an absence of this effect for Mohe meteor radar observations in northern China [see, e.g., Liu et al ., ] (53.5°N, 122.3°E, magnetic latitude, 44°N). This suggests a geomagnetic latitude dependence connected to the outer radiation belts which will be reported in detail in a following paper.…”

Section: Discussion and Summarymentioning

confidence: 99%

Response of neutral mesospheric density to geomagnetic forcing

Xue

Younger

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

We report an analysis of the neutral mesosphere density response to geomagnetic activity from January 2016 to February 2017 over Antarctica. Neutral mesospheric densities from 85 to 95 km are derived using data from the Davis meteor radar (68.5°S, 77.9°E) and the Microwave Limb Sounder on the Aura satellite. Spectral and Morlet wavelet analyses indicate that a prominent oscillation with a periodicity of 13.5 days is observed in the mesospheric density during the declining phase of solar cycle 24 and is associated with variations in solar wind high‐speed streams and recurrent geomagnetic activity. The periodic oscillation in density shows a strong anticorrelation with periodic changes in the auroral electrojet index. These results indicate that a significant decrease in neutral mesospheric density as the geomagnetic activity enhances.

show abstract

Section: Discussion and Summarymentioning

confidence: 99%

Response of neutral mesospheric density to geomagnetic forcing

Xue

Younger

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…With the support of Chinese Meridian Project, four meteor radars were installed at Mohe (53.5°N, 122.3°E), Beijing (40.3°N, 116.2°E), Wuhan (30.5°N, 114.6°E), and Sanya (18.3°N, 109.6°E) in 2011 around the geographic longitude of 120°E. Further details regarding these meteor radars can be found in previous literatures (Liu et al, 2017; Ma et al, 2017; Xiong et al, 2013; Yu et al, 2013, 2015). Besides these four radars, the Kunming meteor radar (25.6°N, 103.8°E), which belongs to the China Research Institute of Radio Wave Propagation, has been operated since year 2011.…”

Section: Meteor Radar Data and Methods Of Analysismentioning

confidence: 99%

Variations of Mesospheric Neutral Winds and Tides Observed by a Meteor Radar Chain Over China During the 2013 Sudden Stratospheric Warming

Luan

Lei

et al. 2020

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

The neutral winds in the mesospheric and lower thermospheric region obtained from a meteor radar chain within the latitudinal range of 18-53°N were decomposed to examine the latitudinal structures of the tides and mean winds during the sudden stratospheric warming (SSW) event in 2013. The zonal wind reversed from eastward to westward and the westward wind was larger at middle latitudes than that at low latitudes during the SSW. Meanwhile, a sharp increase in the northward wind was noticeable at all stations. The amplitudes of the diurnal and semidiurnal tides decreased from 5 to 13 January and increased subsequently. At the same time, the terdiurnal tides increased in amplitude, especially at Beijing, Wuhan, and Kunming, in response to the SSW. Moreover, the tidal phases showed a large shift that corresponded to a great increase in tidal wavelengths in the semidiurnal and terdiurnal components. The wavelet analysis further revealed that the quasi 6-day wave oscillations dominated in the winds at Kunming and Sanya stations, as well as the quasi 16-day wave dominated in the zonal wind, and the quasi 11-day and 16-day waves were prevailing in the meridional winds at Beijing and Wuhan. In the same vein, the quasi 16-day and quasi 11-day waves were prominent in the zonal and meridional winds during 1-18 January at Mohe. Therefore, the tide-planetary wave interactions played a significant role in modulating the behaviors of the mesospheric and lower thermospheric dynamics during the SSW event.LI ET AL.6 of 16 SSW, the structure of daily variabilities was similar at Beijing, Wuhan, Kunming, and Sanya. However, during the 2013 SSW, the semidiurnal amplitude in the zonal wind decreased over Mohe, Beijing, and Wuhan. It decreased further after~9 days and returned to its normal value at around 17 January over Mohe and Beijing. Whereas the semidiurnal amplitude in the zonal wind decreased before the SSW onset and increased during the SSW onset below 90 km at Kunming and below 94 km at Sanya. The variations of semidiurnal amplitude of the zonal wind before and after the 2013 SSW onset were small at all stations. Overall, there were significant fluctuations in the zonal semidiurnal tides over Wuhan, Kunming, and Sanya.The semidiurnal amplitude of the meridional wind was comparable with that of the zonal wind over Mohe. From Wuhan to Sanya, the semidiurnal amplitude of the meridional wind decreased as the latitude decreased. A similar reduction was observed at all stations during the 2013 SSW. Specifically, the reduction of semidiurnal amplitude

show abstract

“…Here, • := e i2π(f • t+m • λ) represents the phase of a wave • (e.g., He et al, 2017). The 16 d PW is a normal wave, and its intrinsic period of 12.5 d is determined by the resonant properties of the atmosphere (e.g., Ahlquist, 1982;Longuet-Higgins, 1968;Madden, 2007;Salby, 1984). Having been Doppler shifted by the prevailing eastward wind during winter, the PW is observed at a period up to 20 d, with an average of 16 d (for the climatology of the 16 d PW, cf.…”

Section: Targeting Waves and Assignment Of Zonal Wave Numbermentioning

confidence: 99%

Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes

Chau

2019

Atmos. Chem. Phys.

View full text Add to dashboard Cite

In the last decades, mesospheric tides have been intensively investigated with observations from both groundbased radars and satellites. Single-site radar observations provide continuous measurements at fixed locations without horizontal information, whereas single-spacecraft missions typically provide global coverage with limited temporal coverage at a given location. In this work, by combining 8 years (2009-2016) of mesospheric winds collected by five specular meteor radars from three different longitudinal sectors at boreal midlatitudes (49 ± 8.5 • N), we develop an approach to investigate the most intense global-scale oscillation, namely at the period T = 12 ± 0.5 h. Six waves are resolved: the semidiurnal westward-traveling tidal modes with zonal wave numbers 1, 2, and 3 (SW1, SW2, SW3), the lunar semidiurnal tide M2, and the upper and lower sidebands (USB and LSB) of the 16 d wave nonlinear modulation on SW2. The temporal variations of the waves are studied statistically with a special focus on their responses to sudden stratospheric warming events (SSWs) and on their climatological seasonal variations. In response to SSWs, USB, LSB, and M2 enhance, while SW2 decreases. However, SW1 and SW3 do not respond noticeably to SSWs, contrary to the broadly reported enhancements in the literature. The USB, LSB, and SW2 responses could be explained in terms of energy exchange through the nonlinear modulation, while LSB and USB might previously have been misinterpreted as SW1 and SW3, respectively. Besides, we find that LSB and M2 enhancements depend on the SSW classification with respect to the associated split or displacement of the polar vortex. In the case of seasonal variations, our results are qualitatively consistent with previous studies and show a moderate cor-relation with an empirical tidal model derived from satellite observations.Published by Copernicus Publications on behalf of the European Geosciences Union.

show abstract

Mesospheric temperatures estimated from the meteor radar observations at Mohe, China

Cited by 24 publications

References 59 publications

Response of neutral mesospheric density to geomagnetic forcing

Response of neutral mesospheric density to geomagnetic forcing

Variations of Mesospheric Neutral Winds and Tides Observed by a Meteor Radar Chain Over China During the 2013 Sudden Stratospheric Warming

Mesospheric semidiurnal tides and near-12 h waves through jointly analyzing observations of five specular meteor radars from three longitudinal sectors at boreal midlatitudes

Contact Info

Product

Resources

About