Manifestation of reanalyzed QBO and SSC signals

Pišoft, Petr; Holtanová, Eva; Huszár, Peter; Kalvová, Jarošlava; Mikšovský, Jiří; Raidl, Aleš; Zemánková, Kateřina; Žák, Michal

doi:10.1007/s00704-012-0752-5

Cited by 6 publications

(3 citation statements)

References 47 publications

(70 reference statements)

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“…Finally, in connection with the jet location above the region of interest, we can expect a strong contribution to the IGW spectrum from spontaneous emission processes (Plougonven and Zhang, 2014). Evidence for this claim can be found, e.g., in Hirota and Niki (1985) and Sato (1994), who analysed middle and upper atmospheric radar data (located at Shigaraki, Japan, falling into our region of interest) and who found inertia IGWs propagating upward and downward from the jet stream.…”

Section: Possible Wave Sourcesmentioning

confidence: 63%

Enhanced internal gravity wave activity and breaking over the northeastern Pacific–eastern Asian region

Šácha

Kuchař²,

Jacobi

et al. 2015

Atmos. Chem. Phys.

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Abstract. We have found a stratospheric area of anomalously low annual cycle amplitude and specific dynamics in the stratosphere over the northeastern Pacific–eastern Asia coastal region. Using GPS radio occultation density profiles from the Formosat Satellite Mission 3/Constellation Observing System for Meteorology, Ionosphere, and Climate (FORMOSAT-3/COSMIC), we have discovered an internal gravity wave (IGW) activity and breaking hotspot in this region. Conditions supporting orographic wave sourcing and propagation were found. Other possible sources of wave activity in this region are listed. The reasons why this particular IGW activity hotspot was not discovered before as well as why the specific dynamics of this region have not been pointed out are discussed together with the weaknesses of using the mean potential energy as a wave activity proxy. Possible consequences of the specific dynamics in this region on the middle atmospheric dynamics and transport are outlined.

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Section: Possible Wave Sourcesmentioning

confidence: 63%

Enhanced internal gravity wave activity and breaking over the northeastern Pacific–eastern Asian region

Šácha

Kuchař²,

Jacobi

et al. 2015

Atmos. Chem. Phys.

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“…Soukharev and Hood, 2006;Frame and Gray, 2010;Gray et al, 2013;Mitchell et al, 2014) used multiple linear regression to extract the solar signal and separate other climate phenomena like the QBO, the effect of aerosols, North Atlantic Oscillation (NAO), El Niño-Southern Oscillation (ENSO) or trend variability. Apart from this conventional method, it is possible to use alternative approaches to isolate and examine particular signal components, such as wavelet analysis (Pisoft et al, 2012(Pisoft et al, , 2013 or empirical mode decomposition (Coughlin and Tung, 2004). The nonlinear character of the climate system also suggests potential benefits from the application of fully nonlinear attribution techniques to study the properties…”

Section: A Kuchar Et Al: Solar Cycle In Current Reanalysesmentioning

confidence: 99%

The 11-year solar cycle in current reanalyses: a (non)linear attribution study of the middle atmosphere

et al. 2015

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Abstract. This study focusses on the variability of temperature, ozone and circulation characteristics in the stratosphere and lower mesosphere with regard to the influence of the 11-year solar cycle. It is based on attribution analysis using multiple nonlinear techniques (support vector regression, neural networks) besides the multiple linear regression approach. The analysis was applied to several current reanalysis data sets for the 1979-2013 period, including MERRA, ERA-Interim and JRA-55, with the aim to compare how these types of data resolve especially the doublepeaked solar response in temperature and ozone variables and the consequent changes induced by these anomalies. Equatorial temperature signals in the tropical stratosphere were found to be in qualitative agreement with previous attribution studies, although the agreement with observational results was incomplete, especially for JRA-55. The analysis also pointed to the solar signal in the ozone data sets (i.e. MERRA and ERA-Interim) not being consistent with the observed double-peaked ozone anomaly extracted from satellite measurements. The results obtained by linear regression were confirmed by the nonlinear approach through all data sets, suggesting that linear regression is a relevant tool to sufficiently resolve the solar signal in the middle atmosphere. The seasonal evolution of the solar response was also discussed in terms of dynamical causalities in the winter hemispheres. The hypothetical mechanism of a weaker BrewerDobson circulation at solar maxima was reviewed together with a discussion of polar vortex behaviour.

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“…Maintaining consistency with Holton and Tan (1980), more studies used the equatorial zonalmean zonal wind at 50 hPa (e.g., Chen and Li, 2007;Chen et al, 2004; Thompson et al, 2002;Wei et al, 2007). (Ebdon, 1975;Huesmann and Hitchman, 2003;Pascoe et al, 2005) and used equatorial zonal winds at these levels (Naoe et al, 2017;Pisoft et al, 2013;Pogoreltsev et al, 2014). The phase of the QBO is also determined by zonal winds at 10 hPa (Bushell et al, 2020;Pena-Ortiz et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Necessity of Standardizing the Definition of QBO Phases

Wei¹,

Chen²,

Ma³

et al. 2021

Preprint

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As one of the most mysterious and fascinating natural phenomena, the quasi-biennial oscillation (QBO) has an extraordinary period of ~28 months and features alternative westerly and easterly propagating downward from the upper to the lower stratosphere. The QBO is also one of the most important interannual variabilities in the atmosphere, and has dynamical influences on global circulation from the troposphere to the mesosphere, from the tropics to the poles. It also modulates the distribution of chemical constituents such as ozone and methane, and influences tropical cyclone genesis over tropical oceans. The global effect of the QBO is believed to depend on its phase and structure. However, existing definitions of the phase and strength of the QBO remain ambiguous. Previous studies considered tropical zonal winds at 70, 50, 45, 40, 30, 20, and/or 10 hPa, disregarding the propagating characteristic of the QBO in the equatorial stratosphere. In this study, we point out that the definition of the QBO can influence the interpretation of the dynamical effect and decadal variation of the QBO. Therefore, the definition of QBO phases considering the propagating characteristics of the QBO needs to be urgently standardized. By dividing the QBO evolution into multiple phases instead of only two (westerly and easterly), a deeper insight into the dynamics of the QBO, particularly its global effects, may be obtained.

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Manifestation of reanalyzed QBO and SSC signals

Cited by 6 publications

References 47 publications

Enhanced internal gravity wave activity and breaking over the northeastern Pacific–eastern Asian region

Enhanced internal gravity wave activity and breaking over the northeastern Pacific–eastern Asian region

The 11-year solar cycle in current reanalyses: a (non)linear attribution study of the middle atmosphere

Necessity of Standardizing the Definition of QBO Phases

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