Influence of sudden stratospheric warming on the mesosphere/lower thermosphere from the hydroxyl emission observations and numerical simulations

Медведева, И. В.; Semenov, A. I.; Pogoreltsev, Alexander; Tatarnikov, A. V.

doi:10.1016/j.jastp.2019.02.005

Cited by 19 publications

(9 citation statements)

References 31 publications

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“…The maximum positive ΔNmF2 value in the tidal range was ~2.5 times higher than mean seasonal value obtained for the February night period (table 2). Note, that the increase in tidal components during SSW was considered as an ionospheric response to SSW in recent studies [3]. During the final stratospheric warming in March 2016, the disturbances in NmF2 were similar to the observed in the early February ( figure 6).…”

Section: Resultssupporting

confidence: 55%

“…Winter sudden stratospheric warming (SSW) is one of the most significant phenomena in the lower and middle atmosphere. SSW can cause disturbances in a wide range of atmospheric heights, from the troposphere to the thermosphere, and influence on the upper neutral atmosphere and ionosphere parameters [1][2][3][4][5]. During SSWs, activity of atmospheric waves with different time scales can increase significantly.…”

Section: Introductionmentioning

confidence: 99%

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Manifestation of wave activity in the upper atmosphere during winter sudden stratospheric warmings

Медведева¹,

Ratovsky²

2020

Sovr. Probl. DZZ Kosm.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Manifestation of wave activity in the upper atmosphere during winter sudden stratospheric warmings

Медведева¹,

Ratovsky²

2020

Sovr. Probl. DZZ Kosm.

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“…Note these modeled low‐to‐middle‐latitudes increases in H abundance during a SSW and MC could be more a result of the time periods we selected for our differences, as SABER H between 30°N and 35°N does not show that large of an increase in the 2012–2013 winter (see Figure S5). However, Medvedeva et al (2019) reported local increases in [O] from spectrometric observations between ∼50°N and 55°N during the January 2013 SSW. Given these observational differences, our numerical experiments may offer some insight into the cause of such discrepancies.…”

Section: Resultsmentioning

confidence: 99%

Coupling From the Middle Atmosphere to the Exobase: Dynamical Disturbance Effects on Light Chemical Species

et al. 2020

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This paper characterizes the impacts of sudden stratospheric warmings (SSWs) and mesospheric coolings (MCs) on the light species distribution (i.e., helium [He], and atomic hydrogen [H]) of the thermosphere using a combined data-modeling approach. Performing a set of numerical experiments with a general circulation model whose middle atmospheric dynamical and thermodynamical fields were constrained using a numerical weather prediction system, we simulate the effects of SSWs and MCs on light chemical species, and via comparisons with two data sets taken from the mesosphere and thermosphere, we quantify the associated variability in light species abundances and mass density. Large depletions in the observed and modeled polar H abundance in the mesosphere and lower thermosphere (MLT) occur with MC onset, as opposed to SSW onset. Depletions in all light thermospheric species at high northern latitudes extend up to the exobase in our model simulations during the January 2013 SSW/MC period, with the largest depletions simulated for the lightest species. Further, our modeling work substantiates the paradigm of increased mixing in the MLT driven by a meridional residual circulation during SSWs resulting from enhanced small-scale gravity wave and migrating semidiurnal tidal forcing; the former being the primary driver and the latter of secondary but notable importance in our model simulations. SSW/MC induced light species variability then gets projected upward into the thermosphere through molecular diffusion. Modeled light species variability during the January 2013 SSW/MC event suggests SSW/MC signatures could be present in the topside ionosphere and plasmasphere. Plain Language Summary Sudden stratospheric warmings (SSWs) and mesospheric coolings (MCs) are episodic polar middle atmospheric (∼12-80 km or ∼7-50 miles altitude) dynamical weather events driven by increased wave forcing from the troposphere. These events are known to have global effects on the meteorology of the upper atmosphere (i.e., the thermosphere and ionosphere). Observational and modeling evidence presented in this study demonstrate that SSWs and MCs in the middle atmosphere act to drive changes in the chemical composition of the upper atmosphere through an intricate series of processes, set in motion by SSW/MC enhancements in lower and middle atmospheric wave forcing. Our results show that SSW/MC driven changes in particularly light species like hydrogen extend well into the transition region between Earth's atmosphere and outer space. This implies that middle atmospheric weather may have an impact on the plasma populations several Earth radii above Earth's surface (∼10,000 miles or more away).

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“…Since the first observational evidence of the mesosphere response to the SSWs (Quiroz, 1969), numerous studies have been made on the mesosphere coupling with the polar stratosphere during the SSW in the NH high and midlatitudes (e.g., Charlton & Polvani, 2007; de Wit et al, 2015; Medvedeva et al, 2019). However, similar studies for the SH are by far fewer than for the NH (Eswaraiah et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Unusual Changes in the Antarctic Middle Atmosphere During the 2019 Warming in the Southern Hemisphere

Eswaraiah

Kim

Lee

et al. 2020

Geophysical Research Letters

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A rare sudden stratosphere warming (SSW) occurred in the Southern Hemisphere polar region in 2019. The polar stratosphere temperature and planetary wave (PW) enhancements are found to be unusual from the history for 40 years; hence, it is an "Extremely-Rare" SSW. The distinct features of the mesosphere winds were observed during the SSW, in association with the traveling PWs in the stratosphere. The mesosphere zonal winds reversed for about 20 days before the peak SSW. Meteor radar (MR) and Modern-Era Retrospective Analysis for Research and Applications (MERRA)-2 observations indicate that the zonal wind reversal was descended with time, and the reversal was larger over~72°S than the MR site (62°S). The MR detected the PWs of 14-22 days before and 8-12 days following the SSW in the mesosphere. We further noticed the enhancement of wavenumber 1 signature in the mesosphere during the peak SSW over the polar region. Thus, the polar middle-atmosphere is greatly affected by the SSW.

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Influence of sudden stratospheric warming on the mesosphere/lower thermosphere from the hydroxyl emission observations and numerical simulations

Cited by 19 publications

References 31 publications

Manifestation of wave activity in the upper atmosphere during winter sudden stratospheric warmings

Manifestation of wave activity in the upper atmosphere during winter sudden stratospheric warmings

Coupling From the Middle Atmosphere to the Exobase: Dynamical Disturbance Effects on Light Chemical Species

Unusual Changes in the Antarctic Middle Atmosphere During the 2019 Warming in the Southern Hemisphere

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