Comprehensive Study of the Climatology of the Quasi‐6‐Day Wave in the MLT Region Based on Aura/MLS Observations and SD‐WACCM‐X Simulations

Qin, Yusong; Gu, Sheng‐Yang; Teng, Chen‐Ke‐Min; Dou, Xiankang; Yu, You; Li, Na

doi:10.1029/2020ja028454

Cited by 17 publications

(33 citation statements)

References 53 publications

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“…The results for the W1 component suggest that the Q6DW is predominant at this height, which is in agreement with previous studies (e.g., Qin et al., 2021). The maximum amplitude of the Q6DW (∼250 m) is greater than that of the Q4DW (∼180 m).…”

Section: Resultssupporting

confidence: 93%

“…Quasi‐normal mode oscillations in the middle atmosphere have been studied using global satellite data. Among others, the quasi‐6‐day wave (Q6DW), which is considered to be a manifestation of the (1,1) mode, is most extensively examined (e.g., Forbes & Zhang, 2017; Hirota & Hirooka, 1984; Qin et al., 2021; Riggin et al., 2006; Wu et al., 1994). Tropospheric processes are thought to be a source of the Q6DW (Miyoshi & Hirooka, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2

2021

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This paper describes global characteristics of the westward‐propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi‐4‐day wave (Q4DW), which is considered to be a manifestation of the (2,1) Rossby normal mode. A climatology of the Q4DW is derived from geopotential height measurements by the Aura Microwave Limb Sounder during August 2004–December 2020. In the mesosphere and lower thermosphere (MLT), amplitude maxima occur at mid latitudes in May and August in the Northern Hemisphere, and in February and November in the Southern Hemisphere. With the amplitude exceeding 300 m, the Q4DW sometimes becomes the dominant mode of traveling planetary waves in the MLT. The seasonal variation is largely determined by the zonal mean state. As predicted by previous modeling work, the amplitude grows rapidly with height on the equatorward side of the critical layer, where the zonal mean flow is weakly eastward relative to the wave. The wave growth can be particularly large when there is a region of unstable mean flow across the boundary of the critical layer. This condition is met not only during the seasonal amplification of the Q4DW but also during some Arctic sudden stratospheric warming events, leading to an unseasonal enhancement.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2

2021

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“…Some climatological Q10DW events may be included in the statistic since the Q10DW is originally active during wintertime (Forbes & Zhang, 2015). Moreover, the statistical peak for Q6DW also contains some climatological post-March equinox Q6DW events (Qin et al, 2021) if SSW occurs in late March or April (e.g., 2011), besides secondary wave events during SSWs (e.g., 2005 and2008). However, it should be noted that the results in Figure 10 depend to some extent on the length of the calculation window.…”

Section: Discussionmentioning

confidence: 99%

On the Westward Quasi‐8‐Day Planetary Waves in the Middle Atmosphere During Arctic Sudden Stratospheric Warmings

Qin

Dou

et al. 2021

JGR Atmospheres

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Using the geopotential height measurements from the Aura Microwave Limb Sounder and the Sounding of the Atmosphere using Broadband Emission Radiometry instrument on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics satellite, we found eight westward quasi-8-day wave (Q8DW) events with zonal wavenumber 1 (W1) during the Arctic sudden stratospheric warmings (SSWs) in 2005-2020. The W1 Q8DW perturbations are mainly confined to the middle and high latitudes in the Northern Hemisphere, and peak at ∼50-80 km. Specified Dynamics Whole Atmosphere Community Climate Model eXtended version simulations are utilized to reproduce the Q8DW activities. The diagnostic results indicate that the W1 Q8DWs originate from the high latitudes in the Northern Hemisphere stratosphere. Their excitation, propagation, and amplification are primarily influenced by the critical layers and baroclinic/barotropic instability, which are dependent on the background conditions during SSWs. Our statistical results show that the W1 planetary waves with periods shorter than 12 days during the Arctic SSWs are most frequently observed at the period of ∼8 days, which is significantly different from the climatological periods of the Rossby (1, 1) and (1, 2) normal modes (6.14 and 9.81 days, respectively). These results indicate that the W1 Q8DW may be a new wave mode. Finally, we found that the reversal (or deceleration) and the recovery of the zonal mean flow during SSWs can result in a zonally symmetric Q8DW, and the W1 Q8DW is likely the child wave generated by the nonlinear interaction between the stationary planetary wave with zonal wavenumber 1 and zonally symmetric Q8DW. QIN ET AL.

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“…The WACCM simulations and those reanalysis data showed similar responses of the Brewer-Dobson circulation to the ENSO, the QBO, and the solar cycle. In addition, we conducted other atmospheric studies based on the SD-WACCM-X simulations and compared these results to others based on some observations [54,55]. Therefore, we think the SD-WACCM-X simulations in this work have high reliability and credibility.…”

Section: Model and Methodsmentioning

confidence: 79%

Impact of Solar Activity on Global Atmospheric Circulation Based on SD-WACCM-X Simulations from 2002 to 2019

Teng

Qin

et al. 2021

Atmosphere

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In this study, a global atmospheric model, Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension (SD-WACCM-X), and the residual circulation principle were used to study the global atmospheric circulation from the lower to upper atmosphere (~500 km) from 2002 to 2019. Our analysis shows that the atmospheric circulation is clearly influenced by solar activity, especially in the upper atmosphere, which is mainly characterized by an enhanced atmospheric circulation in years with high solar activity. The atmospheric circulation in the upper atmosphere also exhibits an ~11 year period, and its variation is highly correlated with the temporal variation in the F10.7 solar index during the same time series, with a maximum correlation coefficient of up to more than 0.9. In the middle and lower atmosphere, the impact of solar activity on the atmospheric circulation is not as obvious as in the upper atmosphere due to some atmospheric activities such as the Quasi-Biennial Oscillation (QBO), El Niño–Southern Oscillation (ENSO), sudden stratospheric warming (SSW), volcanic forcing, and so on. By comparing the atmospheric circulation in different latitudinal regions between years with high and low solar activity, we found the atmospheric circulation in mid- and high-latitude regions is more affected by solar activity than in low-latitude and equatorial regions. In addition, clear seasonal variation in atmospheric circulation was detected in the global atmosphere, excluding the regions near 10−4 hPa and the lower atmosphere, which is mainly characterized by a flow from the summer hemisphere to the winter hemisphere. In the middle and low atmosphere, the atmospheric circulation shows a quasi-biennial oscillatory variation in the low-latitude and equatorial regions. This work provides a referable study of global atmospheric circulation and demonstrates the impacts of solar activity on global atmospheric circulation.

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Comprehensive Study of the Climatology of the Quasi‐6‐Day Wave in the MLT Region Based on Aura/MLS Observations and SD‐WACCM‐X Simulations

Cited by 17 publications

References 53 publications

Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2

Quasi‐4‐Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2

On the Westward Quasi‐8‐Day Planetary Waves in the Middle Atmosphere During Arctic Sudden Stratospheric Warmings

Impact of Solar Activity on Global Atmospheric Circulation Based on SD-WACCM-X Simulations from 2002 to 2019

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