Simulating planetary wave propagation to the upper atmosphere during stratospheric warming events at different mountain wave scenarios

Гаврилов, Н. М.; Koval, A. V.; Pogoreltsev, Alexander; Savenkova, Elena N.

doi:10.1016/j.asr.2017.08.022

Cited by 21 publications

(21 citation statements)

References 85 publications

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“…The EP flux directed upward corresponds to the PW heat flux directed to the north, although the southward EP flux corresponds to the northward wave momentum flux. Used formulas were discussed by Gavrilov, Koval, et al (). In addition, EP flux divergence was calculated, which determines the acceleration of zonal‐mean stream produced by PWs (Andrews et al, ).…”

Section: Numerical Model and Methodologymentioning

confidence: 99%

Reactions of the Middle Atmosphere Circulation and Stationary Planetary Waves on the Solar Activity Effects in the Thermosphere

et al. 2019

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Using numerical simulations of the general atmospheric circulation during boreal winter, statistically confident evidences are obtained for the first time, demonstrating that changes in the solar activity (SA) in the thermosphere at heights above 100 km can influence propagation and reflection conditions for stationary planetary waves (SPWs) and can modify the middle atmosphere circulation below 100 km. A numerical mechanistic model simulating atmospheric circulation and SPWs at heights 0-300 km is used. To achieve sufficient statistical confidence, 80 pairs of 15-day intervals were extracted from an ensemble of 16 pairs of model runs corresponding to low and high SA. Results averaged over these intervals show that impacts of SA above 100 km change the mean zonal wind and temperature up to 10% at altitudes below 100 km. The statistically confident changes in SPW amplitudes due to SA impacts above 100 km reach up to 50% in the thermosphere and 10-15% in the middle atmosphere depending on zonal wavenumber. Changes in wave amplitudes correspond to variations of the Eliassen-Palm flux and may alter dynamical and thermal SPW impacts on the mean wind and temperature. Thus, variable conditions of SPW propagation and reflection at thermospheric altitudes may influence the middle atmosphere circulation, thermal structure, and planetary waves. Plain Language SummaryAtmospheric large-scale disturbances, for instance planetary waves, play a valuable role in atmospheric general circulation, influencing its dynamical and thermal conditions. Solar activity might significantly change the mean temperature at heights above 100 km and alter conditions of wave propagation and reflection in the thermosphere. In the present study, we perform numerical simulations to obtain statistically confident results showing noticeable response of atmospheric circulation at altitudes below 100 km to impacts of solar activity above 100 km.

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Section: Numerical Model and Methodologymentioning

confidence: 99%

Reactions of the Middle Atmosphere Circulation and Stationary Planetary Waves on the Solar Activity Effects in the Thermosphere

et al. 2019

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“…The behavior of planetary-scale oscillations in the mesosphere and lower thermosphere (MLT) region during SSW events has been studied extensively via optical methods (e.g., Reisin et al, 2014;Takahashi et al, 2006), satellite (e.g., Pancheva et al, 2009), numerical simulations (e.g., Gavrilov et al, 2018;Limpasuvan et al, 2012Limpasuvan et al, , 2016Liu et al, 2004), and meteor radars (e.g., Gong, Li, et al, 2018;Lima et al, 2011;Ma et al, 2017;Stray et al, 2015;Xiong et al, 2018). Based on the Whole Atmosphere Community Climate Model, Limpasuvan et al (2012) suggested that the planetary-scale oscillations in the MLT region could be generated during an SSW and an elevated stratopause event (ESE).…”

Section: Introductionmentioning

confidence: 99%

Study of a Quasi 4‐Day Oscillation During the 2018/2019 SSW Over Mohe, China

Gong

Zhang

et al. 2020

JGR Space Physics

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We present an analysis of planetary‐scale oscillations during sudden stratospheric warming (SSW) events based on data obtained from a meteor radar located at Mohe (MH, 53.5°N, 122.3°E), the Aura satellite and Modern‐Era Retrospective analysis for Research and Applications, Version 2 data (MERRA2). The planetary‐scale oscillations in the mesosphere and lower thermosphere (MLT) region during eight SSW events from 2012 to 2019 have been statistically investigated. Our analysis reveals that the enhancement or the generation of westward propagating quasi 16‐day oscillation with wavenumber 1 (W1) is a common feature during SSWs over MH. A strong enhancement of the quasi 4‐day oscillation during the 2018/2019 SSW is captured by both radar and satellite observations. The amplified quasi 4‐day oscillation has a period of ~4.3 days in both meridional and zonal winds and with a wavenumber of W2 in the zonal component. Using the meteor radar and MERRA2 data, the vertical structure of the quasi 4‐day oscillation from the stratosphere to the lower thermosphere is derived. The upward propagating feature of the quasi 4‐day oscillation in the meridional component indicates that the oscillation is very likely generated in the lower mesosphere. The mesospheric zonal wind reversal after an elevated stratopause event is observed during the SSW, which results in a negative meridional gradient of the quasi‐geostrophic potential vorticity. Our results not only reveal that the amplified quasi 4‐day oscillation in the MLT region is associated with the 2018/2019 SSW but also suggest that the amplification is originally generated around 60 km due to barotropic/baroclinic instability and propagates upward to MLT region.

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“…Модель может также воспроизводить нормальные атмосферные моды с периодом 2-20 суток [4]. Подробную информацию о процессах, учитываемых в МСВА, а также о стадиях инициализации модели, можно найти в [1,13,19].…”

Section: методы и подходыunclassified

Calculation of the Residual Mean Meridional Circulation According to the Middle and Upper Atmosphere Model

Koval¹

2019

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Проведено численное моделирование общей циркуляции атмосферы с использованием модели средней и верхней атмосферы (МСВА) для января. Рассмотрены формулы для расчета остаточной меридиональной циркуляции на основе полей ветра и температуры воздуха, полученных из МСВА. Полученные распределения эйлеровой средней и остаточной меридиональной циркуляции согласуются с результатами расчетов, проводившихся ранее как на базе наблюдений, так и в результате модельных экспериментов. Волновой вклад в меридиональную циркуляцию в средней атмосфере может превышать 100 % от соответствующих компонент средней меридиональной скорости и оказывать влияние на меридиональный перенос газовых составляющих атмосферы. Ключевые слова: атмосферная циркуляция, численное моделирование, остаточная циркуляция.

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Simulating planetary wave propagation to the upper atmosphere during stratospheric warming events at different mountain wave scenarios

Cited by 21 publications

References 85 publications

Reactions of the Middle Atmosphere Circulation and Stationary Planetary Waves on the Solar Activity Effects in the Thermosphere

Reactions of the Middle Atmosphere Circulation and Stationary Planetary Waves on the Solar Activity Effects in the Thermosphere

Study of a Quasi 4‐Day Oscillation During the 2018/2019 SSW Over Mohe, China

Calculation of the Residual Mean Meridional Circulation According to the Middle and Upper Atmosphere Model

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