Interpretation of the mesospheric and lower thermospheric mean winds observed by MF radar at about 30°N with the 2D-SOCRATES model

Xiao, Chunsheng; Hu, Xiong; Zhang, X. X.; Zhang, D. Y.; Wu, Xinke; Gong, Xiaoyan; Igarashi, K.

doi:10.1016/j.asr.2006.12.035

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…The eastward flow during winter period can be related to the mesospheric westerly jet of winter hemisphere. The eastward wind prevailing in winter decreases with increasing height, which is consistent with that reported by Xiao et al [2007]. Inspection of the composite monthly variations of M‐100 rocket, HRDI, and MST radar observations, which belongs to different time spans, imposes a surprising result that the eastward flow during winter months decreases with time.…”

Section: Resultssupporting

confidence: 88%

Low‐latitude mesospheric mean winds observed by Gadanki mesosphere‐stratosphere‐troposphere (MST) radar and comparison with rocket, High Resolution Doppler Imager (HRDI), and MF radar measurements and HWM93

Kumar¹,

Ratnam

Patra

et al. 2008

J. Geophys. Res.

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[1] Low-latitude mesospheric winds are investigated using data collected from 1995 to 2006 (11 years) by Indian MST radar located at Gadanki (13.5°N, 79.2°E). Clear eastward and westward flow in zonal wind is noticed during solstices and equinoxes, respectively. The meridional wind shows equatorward flow below 75 km and poleward flow above 75 km quite consistent with that observed with other techniques. The winds show a clear semiannual oscillation (SAO) with maxima during equinoxes. The strength of the SAO during spring is larger than that of fall equinox, and the first peak occurs at higher altitudes than the second peak. The observed features are compared with other techniques, namely, rocket, High Resolution Doppler Imager (HRDI), and medium frequency (MF) radar and also with horizontal wind model HWM93. In general, good comparison is seen among various techniques, with some discrepancy observed in amplitudes. Interestingly, decrease in eastward wind with time during winter months is noticed. The significance of the present results lies in showing the consistency/ inconsistency of various experimental techniques to measure the middle atmospheric winds, which are very important to assess the climate variability.

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Section: Resultssupporting

confidence: 88%

Low‐latitude mesospheric mean winds observed by Gadanki mesosphere‐stratosphere‐troposphere (MST) radar and comparison with rocket, High Resolution Doppler Imager (HRDI), and MF radar measurements and HWM93

Kumar¹,

Ratnam

Patra

et al. 2008

J. Geophys. Res.

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“…Typically, eastward winds (Figure 3a) dominate in the undisturbed winter MLT, both at Esrange (ER) [54] and the mid-latitude stations (KR and CR) [65]. However, in the tropical region during winter, dominant eastward winds exist between 70 and 85 km [41,66], while above 85 km, they are westward [67][68][69]. Hence, any westward winds or wind reversals that occurred above 85 km over the TR station will not be due to SSW and The panels show the wind field time series from the polar to tropical regions (from top to bottom).…”

Section: Mesospheric Mean Wind Structurementioning

confidence: 98%

“…However, a peak wind reversal (−18 m/s) occurred two days after the peak SSW (16 February). In the tropical region, typically, the upper mesospheric winds are westward [66][67][68][69]; hence, in the upper mesosphere of the tropical region, the effect of SSW is less significant.…”

Section: Polar Stratosphere-mesosphere Connectionmentioning

confidence: 99%

Intriguing Aspects of Polar-to-Tropical Mesospheric Teleconnections during the 2018 SSW: A Meteor Radar Network Study

Eswaraiah,

Seo,

Kumar

et al. 2023

Atmosphere

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Using a network of meteor radar observations, observational evidence of polar-to-tropical mesospheric coupling during the 2018 major sudden stratosphere warming (SSW) event in the northern hemisphere is presented. In the tropical lower mesosphere, a maximum zonal wind reversal (−24 m/s) is noted and compared with that identified in the extra-tropical regions. Moreover, a time delay in the wind reversal between the tropical/polar stations and the mid-latitudes is detected. A wide spectrum of waves with periods of 2 to 16 days and 30–60 days were observed. The wind reversal in the mesosphere is due to the propagation of dominant intra-seasonal oscillations (ISOs) of 30–60 days and the presence and superposition of 8-day period planetary waves (PWs). The ISO phase propagation is observed from high to low latitudes (60° N to 20° N) in contrast to the 8-day PW phase propagation, indicating the change in the meridional propagation of winds during SSW, hence the change in the meridional circulation. The superposition of dominant ISOs and weak 8-day PWs could be responsible for the delay of the wind reversal in the tropical mesosphere. Therefore, this study has strong implications for understanding the reversed (polar to tropical) mesospheric meridional circulation by considering the ISOs during SSW.

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“…The 2D-SOCRATES model is a theoretical model whose wind velocities are the result of a numerical solution to a partial differential equation with middle-atmosphere boundary conditions. The model is populated with a mix of chemical species, mostly hydrocarbons and chlorofluorocarbons [22] [23]. Therefore, there are no oxygen species present in this model to compare with the ozone and green line data.…”

Section: D-socrates Cira-72 Hwm and Pwmmentioning

confidence: 99%

Enhancing Low-Cost Ozone Spectrometers to Measure Mesospheric Winds and Tides

Alam,

Rogers

2015

Preprint

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Ground-based spectrometers have been developed to measure the concentration, velocity, and temperature of ozone in the mesosphere and lower thermosphere (MLT) using low-cost satellite television electronics to observe the 11.072 GHz spectral line of ozone. A two-channel spectrometer has been engineered to yield various performance improvements, including a doubling of the signal-to-noise ratio, improved data processing efficiency, and lower power consumption at 15 W. Following 2009 and 2012 observations of the seasonal and diurnal variations in ozone concentration near the mesopause, the ozone line was observed at an altitude near 95 km and latitude of 38 degrees north using three single-channel spectrometers located at the MIT Haystack Observatory (Westford, MA), Chelmsford High School (Chelmsford, MA), and Union College (Schenectady, NY) pointed south at 8 degrees. Observations from 2009 through 2014 are used to derive the nightly-averaged seasonal variation in meridional velocity, as well as the seasonally-averaged variation with local solar time. The results indicate a seasonal trend in which the winds at 95 km come from the north at about 10 ms −1 in the summer of the northern hemisphere, and from the south at about 10 ms −1 in the winter. Nighttime data from -5 to +5 hours local solar time show a gradual transition of the meridional wind velocity from about -20 ms −1 to +20 ms −1 . These two trends correlate with nighttime wind measurements from the Millstone Hill High-Resolution Fábry-Perot Interferometer (FPI) in Westford, MA, which uses the 557.7 nm green line nightglow from atomic oxygen centered at 95 km. The results have also been compared with average meridional winds measured with meteor radar.

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Interpretation of the mesospheric and lower thermospheric mean winds observed by MF radar at about 30°N with the 2D-SOCRATES model

Cited by 9 publications

References 43 publications

Low‐latitude mesospheric mean winds observed by Gadanki mesosphere‐stratosphere‐troposphere (MST) radar and comparison with rocket, High Resolution Doppler Imager (HRDI), and MF radar measurements and HWM93

Low‐latitude mesospheric mean winds observed by Gadanki mesosphere‐stratosphere‐troposphere (MST) radar and comparison with rocket, High Resolution Doppler Imager (HRDI), and MF radar measurements and HWM93

Intriguing Aspects of Polar-to-Tropical Mesospheric Teleconnections during the 2018 SSW: A Meteor Radar Network Study

Enhancing Low-Cost Ozone Spectrometers to Measure Mesospheric Winds and Tides

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