The observed zonal wind cycle in the southern hemisphere stratosphere

Tucker, G. B.

doi:10.1002/qj.49710544317

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…It seems to us, however, that the relationship of all these with the tropical stratospheric QBO is rather loose and the latter probably may be an independent phenomenon, as suggested earlier by Trenberth (1980). The tropical stratospheric QBO has its largest amplitude in the tropics but it is a pervasive phenomenon, coherent throughout the stratosphere although with systematic phase changes with latitude and altitude (Newel1 et al, 1974;Tucker, 1979) and has zonal symmetry (Wallace, 1973). To explain the variations in ozone QBO characteristics with latitude, Oltmans and London (1982) suggested a possible interaction between tropical wind QBO and the annual variation in poleward transport of ozone by quasi-horizontal eddies.…”

Section: Conclusion and Discussionmentioning

confidence: 86%

Relationship between QBOs of stratospheric winds, ENSO variability and other atmospheric parameters

Kane

1992

Intl Journal of Climatology

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The 50-mbar tropical zonal wind has a predominent quasi-biennial oscillation (QBO) mode of an average period of ca. 28 months, with variation in the range 21-33 months and amplitudes varying within +20 per cent. For the Southern Oscillation, Tahiti minus Darwin (T-D), sea-surface temperature (SST) and equatorial rainfall indices, QBO is not the strongest mode. Periods of 3.6 and ca. 6 years are stronger. The QBO modes for these and other parameters (e.g. surface winds and winds in upper and lower troposphere and stratospheric winter temperature at the North Pole) are very irregular, with amplitudes, phases, and sometimes even period having large changes with time. It seems that these have little relationship with the 50-mbar zonal wind QBO and may have altogether different origins.

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Section: Conclusion and Discussionmentioning

confidence: 86%

Relationship between QBOs of stratospheric winds, ENSO variability and other atmospheric parameters

Kane

1992

Intl Journal of Climatology

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“…Figures 2d-4d) correspond to the results of Tucker [1979], who have analyzed zonal winds in the southern hemisphere stratosphere and noticed that while in the tropics the QBO in zonal wind propagates downward, in middle latitudes it appears to be constant with height. The amplitudes of the northern midlatitude QBO in zonal wind obtained in the stratosphere (Figures 2c and 2d through 4c and 4d) are close to those at 20 mbar in the southern hemisphere noticed by Tucker [ 1979].…”

Section: Up As a Latitudinal Dependence Of The Ozone Qbo In Total Ozonementioning

confidence: 99%

“…Bowman [1989] discussed several possible mechanisms of the extratropical QBO in ozone. It was supposed that ozone anomalies created by the subtropical branch of the QBO-induced MMC, which would be out of phase with the equatorial branch, could be camed to higher latitudes by the climatological mean and eddy circulations [Tucker, 1979;Oltmans and London, 1982]. A major limitation of this mechanism is that it does not explain the high-latitude dynamical QBO.…”

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confidence: 99%

Vertical structure of the extratropical quasi‐biennial oscillation in ozone, temperature, and wind derived from ozonesonde data

Ситнов¹

1996

J. Geophys. Res.

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An analysis of the extratropical ozone sounding data shows that ozone, temperature, and wind as well as tropopause height reveal interannual variability with timescales in the range 24–30 months. This quasi‐biennial variability is noticed, as a rule, in a whole range of ozone sounding heights (0–35 km) and connected with the equatorial quasi‐biennial oscillation (QBO). The QBOs in ozone and temperature are revealed differently in the middle and lower stratosphere as well as in the troposphere. In the middle stratosphere a downward phase progression of the ozone QBO is noticed similar to that of the equatorial dynamical QBOs. The rate of the phase descent of the QBO depends on the geographical region and varies from 0.5 km/month to 1 km/month. In the northern hemisphere the rate is greatest in the polar region but lowest in the subtropics. Local maxima are noticed in the vertical structures of the ozone QBOs. In the northern midlatitudes these maxima are centered at heights of about 12, 20, and 30 km. In the lower stratosphere the QBO in ozone is in phase with that in temperature. Mean amplitudes of the temperature QBO in the troposphere are close to those in the stratosphere. The downward phase progression of the temperature QBO is noticed in the northern midlatitude stratosphere. There is an abrupt phase shift between the QBOs in ozone and temperature in the lower stratosphere and those in the middle troposphere. Over the North American stations the phase shift is that the temperature QBOs in the troposphere are in opposite phase with those in the stratosphere. In zonal and meridional winds the QBO are revealed in the northern midlatitudes. In contrast with the QBOs in ozone and temperature, the wind QBOs reveal the small rate of the phase changing with height. There are no significant phase shifts between the wind QBO in the lower stratosphere and that in the troposphere. The maximum amplitudes of the wind QBO are noticed in the vicinity of the tropopause position and at heights of 25–30 km. Amplitudes of the QBO in zonal wind are close to those in meridional wind. The QBO of tropopause height exposed in the northern hemisphere has the greatest amplitude over Japan. The tropopause height QBO is in opposite phase (in phase) with the QBOs in ozone and temperature in the lower stratosphere (troposphere). Vertical structures of the QBOs obtained for ozone, temperature, and wind in the stratosphere as well as the corresponding QBO of tropopause height support a hypothesis that the extratropical QBO is caused by quasi‐biennial forcing of the mean diabatic meridional circulation by planetary‐scale waves with the resulting modulation of vertical advection.

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“…This order selection criterion, usually called the minimum FPE (final prediction error), is described by Akaike (1970). As recommended by Ulrych and Bishop (1975) we use the first minimum.…”

Section: Univariatementioning

confidence: 99%

“…Many previous studies of the QBO (Tucker, 1979;Passi, 1981;Hamilton, 1981) have used sinusoidal functions to model the QBO. However, the QBO is only quasi-periodic, and a sinusoid assumes a fixed period.…”

Section: Introductionmentioning

confidence: 99%

Autoregressive modelling of the tropical stratospheric quasi‐biennial oscillation

Koscielny

Duchon

1984

J. Climatol.

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Autoregressive time series models are used to make forecasts of stratospheric zonal wind and temperature at Kwajalein Island near the equator in the northern Pacific Ocean. The tropical stratosphere is dominated by the quasi-biennial oscillation (QBO). Because the QBO has a varying period, an autoregressive model is more appropriate than a mixture of sinusoids. The data for 11 levels are efficiently represented by principal components, and univariate and multivariate autoregression models are fitted to six of the principal components. The autoregressive models are used for estimation of variance density spectra and for forecasting. The multivariate model is found to perform better in both detecting and forecasting the quasi-biennial oscillation than either univariate models of the principal components or autoregressive models of the data set itself.

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The observed zonal wind cycle in the southern hemisphere stratosphere

Cited by 11 publications

References 8 publications

Relationship between QBOs of stratospheric winds, ENSO variability and other atmospheric parameters

Relationship between QBOs of stratospheric winds, ENSO variability and other atmospheric parameters

Vertical structure of the extratropical quasi‐biennial oscillation in ozone, temperature, and wind derived from ozonesonde data

Autoregressive modelling of the tropical stratospheric quasi‐biennial oscillation

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