A Comparison of MLT Wind between Meteor Radar Chain and SD-WACCM Results

Zhou, BaoZhu; Xue, Xianghui; Yi, Wu; Ye, Hailun; Zeng, Jie; Chen, Jinsong; Wu, Jianfei; Chen, Tingdi; Dou, and XianKang

doi:10.26464/epp2022040

Cited by 10 publications

(8 citation statements)

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“…In Zhou et al. (2022) they compare meteor radar wind observations in the MLT and SD‐WACCM version 4 (note that whilst this is different from the WACCM‐X version used in this paper, both versions are nudged to MERRA data) for a variety of low‐ and mid‐latitude meteor radar sites in the Northern Hemisphere in China. Our meteor radar results show some similarity to the highest latitude site (Mohe, 53.5°N, 122.3°E) with the same summertime wind reversal appearing in the zonal winds.…”

Section: Discussionmentioning

confidence: 99%

Interannual Variability of Winds in the Antarctic Mesosphere and Lower Thermosphere Over Rothera (67°S, 68°W) During 2005–2021 in Meteor Radar Observations and WACCM‐X

Noble,

Hindley,

Wright

et al. 2024

JGR Atmospheres

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The mesosphere and lower thermosphere (MLT) plays a critical role in linking the middle and upper atmosphere. However, many General Circulation Models do not model the MLT and those that do remain poorly constrained. We use long‐term meteor radar observations (2005–2021) from Rothera (67°S, 68°W) on the Antarctic Peninsula to evaluate the Whole Atmosphere Community Climate Model with thermosphere‐ionosphere eXtension (WACCM‐X) and investigate interannual variability. We find some significant differences between WACCM‐X and observations. In particular, at upper heights, observations reveal eastwards wintertime (April–September) winds, whereas the model predicts westwards winds. In summer (October–March), the observed winds are northwards but predictions are southwards. Both the model and observations reveal significant interannual variability. We characterize the trend and the correlation between the winds and key phenomena: (a) the 11‐year solar cycle, (b) El Niño Southern Oscillation, (c) Quasi‐Biennial Oscillation and (d) Southern Annular Mode using a linear regression method. Observations of the zonal wind show significant changes with time. The summertime westwards wind near 80 km is weakening by up to 4–5 ms−1 per decade, whilst the eastward wintertime winds around 85–95 km are strengthening at by around 7 ms−1 per decade. We find that at some times of year there are significant correlations between the phenomena and the observed/modeled winds. The significance of this work lies in quantifying the biases in a leading General Circulation Model and demonstrating notable interannual variability in both modeled and observed winds.

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Section: Discussionmentioning

confidence: 99%

Interannual Variability of Winds in the Antarctic Mesosphere and Lower Thermosphere Over Rothera (67°S, 68°W) During 2005–2021 in Meteor Radar Observations and WACCM‐X

Noble,

Hindley,

Wright

et al. 2024

JGR Atmospheres

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“…Comparison of these winds with the winds observed from MRs reveals that the wind patterns are very similar, although the oscillations in the meridional components of the WACCM winds are slightly weaker than those in the MR observations. In the past, WACCMs were compared to other MLT wind data sets, such as MR observations, and discussed agreements and deviations of the seasonal variations in mean winds and tides (e.g., Pancheva et al., 2020; Stober et al., 2021; Zhou et al., 2022). Usually, the MR‐observed tidal amplitudes are slightly larger than those in the WACCM output.…”

Section: Methodsmentioning

confidence: 99%

Coordinated Observations of Migrating Tides by Multiple Meteor Radars in the Equatorial Mesosphere and Lower Thermosphere

Wang

et al. 2022

JGR Space Physics

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We present the migrating tidal winds decomposed jointly from multiple meteor radars in four longitudinal sectors situated in the equatorial mesosphere and lower thermosphere. The radars are located in Cariri, Brazil (7.4°S, 36.5°W), Kototabang, Indonesia (0.2°S, 100.3°E), Ascension Island, United Kingdom (7.9° S, 14.4° W), and Darwin, Australia (12.3°S, 130.8°E). Harmonic analysis was used to obtain amplitudes and phases for diurnal and semidiurnal solar migrating tides between 82 and 98 km altitude during the period 2005–2008. To verify the reliability of the tidal components calculated by the four meteor radar wind measurements, we also present a similar analysis for the Whole Atmosphere Community Climate Model winds, which suggests that the migrating tides are well observed by the four different radars. The tides include the important tidal components of diurnal westward‐propagating zonal wavenumber 1 and semidiurnal westward‐propagating zonal wavenumber 2. In addition, the results based on observations were compared with the Climatological Tidal Model of the Thermosphere (CTMT). In general, in terms of climatic features, our results for the major components of migrating tides are qualitatively consistent with the CTMT models derived from satellite data. In addition, the tidal amplitudes are unusually stronger in January–February 2006. This result is probably because tides were enhanced by the 2006 Northern Hemisphere stratospheric sudden warming event.

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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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A Comparison of MLT Wind between Meteor Radar Chain and SD-WACCM Results

Cited by 10 publications

References 0 publications

Interannual Variability of Winds in the Antarctic Mesosphere and Lower Thermosphere Over Rothera (67°S, 68°W) During 2005–2021 in Meteor Radar Observations and WACCM‐X

Interannual Variability of Winds in the Antarctic Mesosphere and Lower Thermosphere Over Rothera (67°S, 68°W) During 2005–2021 in Meteor Radar Observations and WACCM‐X

Coordinated Observations of Migrating Tides by Multiple Meteor Radars in the Equatorial Mesosphere and Lower Thermosphere

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

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