Comparison of stratospheric evolution during the major sudden stratospheric warming events in 2018 and 2019

Ma, Zenghong; Gong, Yun; Zhang, Shaodong; Luo, Jiahui; Zhou, Qihou; Huang, Chunming; Huang, Kai

doi:10.26464/epp2020044

Cited by 14 publications

(26 citation statements)

References 50 publications

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“…It is quasi-stationary wave 2 that was responsible for the splitting of the polar vortex in SSW 2018, in consistency with other studies (e.g. Ma et al, [14] 2020), and the manifestation of this large-scale polar process was observed in the midlatitudes. This is not surprising, since from the mid-February, zonal wind reversal to the easterlies expanded into the extratropics forming the stratospheric easterly layer between the polar and tropical latitudes (Fig.…”

Section: Discussionsupporting

confidence: 90%

“…The vertical structure of the polar vortex determines the propagation of the planetary waves (Rossby waves) that penetrate into the middle atmosphere from the troposphere [4][5][6][7][8]. At high activity of planetary waves, the polar vortex is weakening or even change the zonal wind direction from westerly to easterly, when sudden stratospheric warming (SSW) event is observed [9][10][11][12][13][14] and the destruction of the vortex is accompanied by a sharp increasing of the polar stratosphere-mesosphere temperature [1,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

Wang¹,

Milinevsky²,

Evtushevsky³

et al. 2021

Preprint

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The planetary wave activity in the stratosphere–mesosphere during the Arctic major Sudden Stratospheric Warming (SSW) in February 2018 is discussed on the basis of the microwave radiometer (MWR) measurements of carbon monoxide (CO) above Kharkiv, Ukraine (50.0° N, 36.3° E) and the Aura Microwave Limb Sounder (MLS) measurements of CO, temperature and geopotential heights. From the MLS data, eastward and westward migrations of wave 1/wave 2 spectral components were differentiated, to which less attention was paid in previous studies. Abrupt changes in zonal wave spectra occur with the zonal wind reversal near 10 February 2018. Eastward wave 1 and wave 2, observed before the SSW onset, disappear during the SSW event, when westward wave 1 becomes dominant. Wavelet power spectra of mesospheric CO variations show statistically significant periods in a band of 20–30 days using both MWR and MLS data. Approximately 10-day periods appear only after the SSW onset. Since the propagation of upward planetary waves is limited in the easterly zonal flow in the stratosphere after the zonal wind reversal during SSW, forced planetary waves in the mid-latitude mesosphere may exist due to the instability of the zonal flow.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

Wang¹,

Milinevsky²,

Evtushevsky³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Negative temperature anomalies were strongest (about -30K) in the initial SSW phase (10-20 February, purple in Figure 4). This is consistent with the splitting of the polar vortex and the displacement of the larger vortex part to the western hemisphere (around 90 • W) [12][13][14].…”

Section: Figure 4asupporting

confidence: 87%

“…The onsets of the recent Arctic SSW events in 2018 and 2019 were associated with vortex split and vortex displacement due to the dominance of wave 2 and wave 1, respectively [12][13][14]. Along with the altitude and time variation of the amplitude, wave 1 and wave 2 demonstrate changing periodicity (mainly between two and 30 days) at different phases of the SSW event [20,21].…”

Section: Introductionmentioning

confidence: 98%

“…During high planetary wave activity, the polar vortex is weakened, the zonal circulation may be reversed from westerly to easterly in cases of sudden stratospheric warming (SSW) events [9][10][11][12][13][14], and the destruction of the vortex is accompanied by a sharp increasing (decreasing) of the polar stratosphere (mesosphere) temperature [1,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

et al. 2021

View full text Add to dashboard Cite

The planetary wave activity in the stratosphere–mesosphere during the Arctic major Sudden Stratospheric Warming (SSW) in February 2018 is discussed on the basis of microwave radiometer (MWR) measurements of carbon monoxide (CO) above Kharkiv, Ukraine (50.0° N, 36.3° E) and the Aura Microwave Limb Sounder (MLS) measurements of CO, temperature and geopotential heights. From the MLS data, eastward and westward migrations of wave 1/wave 2 spectral components were differentiated, to which less attention was paid in previous studies. Abrupt changes in zonal wave spectra occurred with the zonal wind reversal near 10 February 2018. Eastward wave 1 and wave 2 were observed before the SSW onset and disappeared during the SSW event, when westward wave 1 became dominant. Wavelet power spectra of mesospheric CO variations showed statistically significant periods of 20–30 days using both MWR and MLS data. Although westward wave 1 in the mesosphere dominated with the onset of the SSW 2018, it developed independently of stratospheric dynamics. Since the propagation of upward planetary waves was limited in the easterly zonal flow in the stratosphere during SSW, forced planetary waves in the mid-latitude mesosphere may exist due to the instability of the zonal flow.

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The dynamical evolution of Sudden Stratospheric Warmings of the Arctic winters in the past decade 2011–2021

Roy

Kuttippurath

2022

SN Appl. Sci.

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In this study, we analyse the dynamical evolution, and identify the major warming (MW) and minor warming events of the past 11 Arctic winters (2010/11–2020/21). During the period, MW is found in 4 winters and is in January for 2012/13, 2018/19 and 2020/21 and in February for 2017/18. A major final warming is observed in the year 2015/16. The most severe MW occurred in the 2012/13 winter, for which a rise in temperature of about 30 K is found at 60° N. The investigation of tropospheric wave forcings for the period reveals that the MW in 2012/13 and 2017/18 is forced by the combined activity of waves 1 and 2, whereas the MW in 2018/19 and 2020/21 is driven by wave 1. Studies have shown that the frequency of Sudden Stratospheric Warming (SSW) in the Arctic has been increasing since 1957/58, which is about 1.1 MWs/winter during 1998/99–2009/10. However, this frequency decreases to 0.36 MWs/winter in the period 2010/11–2020/21 and 0.74 MWs/winter in 1998/99–2020/21. An inverse relationship is observed between the period of occurrence of SSWs and total column ozone (TCO) in the Arctic for the past 11 winters (2010/11–2020/21). For instance, the temperature in the lower stratosphere in January, in which most warmings occur, shows a statistically significant high positive correlation (0.79) with the average TCO in January–March. Therefore, this study assists in understanding the relationship between inter-annual variability of ozone and the occurrence of SSWs.

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Comparison of stratospheric evolution during the major sudden stratospheric warming events in 2018 and 2019

Cited by 14 publications

References 50 publications

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

The dynamical evolution of Sudden Stratospheric Warmings of the Arctic winters in the past decade 2011–2021

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