2001
DOI: 10.1002/qj.49712757416
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Model studies of the interannual variability of the northern‐hemisphere stratospheric winter circulation: The role of the quasi‐biennial oscillation

Abstract: A series of experiments are described that examine the sensitivity of the northem-hemisphere winter evolution to the equatorial quasi-biennial oscillation (QBO). The prime tool for the experiments is a stratospheremesosphere model. The model is integrated over many years with the modelled equatorial winds relaxed towards observed values in order to simulate a realistic QBO. In experiment A the equatorial winds are relaxed towards Singapore radiosonde observations in the height region 16-32 km. In contrast to p… Show more

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Cited by 63 publications
(69 citation statements)
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“…In intermediate wave cases, on the other hand, the SSWs occurred earlier and wave variability was stronger for the easterly phase, in qualitative agreement with the observations by Tan (1980, 1982). The other works except for Gray et al (2002) assumed similar experimental framework of slave stratospheric variations by specifying time-dependent planetary wave forcing. These numerical experiments confirmed the Holton-Tan relationship, by showing the sensitivity of the wintertime polar circulation to the phase of the QBO and the modification of the planetary wave propagation by the QBO.…”
Section: Use Of Stratosphere-only Modelssupporting
confidence: 80%
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“…In intermediate wave cases, on the other hand, the SSWs occurred earlier and wave variability was stronger for the easterly phase, in qualitative agreement with the observations by Tan (1980, 1982). The other works except for Gray et al (2002) assumed similar experimental framework of slave stratospheric variations by specifying time-dependent planetary wave forcing. These numerical experiments confirmed the Holton-Tan relationship, by showing the sensitivity of the wintertime polar circulation to the phase of the QBO and the modification of the planetary wave propagation by the QBO.…”
Section: Use Of Stratosphere-only Modelssupporting
confidence: 80%
“…Some stratosphere-only models have been used to investigate the influence of the equato- rial QBO on the winter stratospheric circulation (e.g., Holton and Austin 1991;O'Sullivan and Young 1992;O'Sullivan and Dunkerton 1994;Gray et al 2001;Gray et al 2002). For example, Holton and Austin (1991) performed parameter sweep in a Matsuno-type SSW (or, slave stratospheric variation) experiment by changing the amplitude of planetary wave forcing at the 100 hPa level with mean zonal flow conditions corresponding to the westerly and easterly phases of the QBO, respectively.…”
Section: Use Of Stratosphere-only Modelsmentioning
confidence: 99%
“…It is a global three-dimensional primitive-equation model of the middle atmosphere with horizontal resolution of 5 degrees latitude, 5 degrees longitude and 32 vertical levels equally spaced in log pressure giving approximately 2 km vertical resolution throughout the model domain of 16-80 km (Gray et al 2001a). It is a mechanistic model with temperature and horizontal winds as prognostic variables and a lower boundary located near the tropopause at which 100 hPa (approx.…”
Section: The Modelmentioning
confidence: 99%
“…In this way we aim to avoid any predisposition to a particular background zonal-wind distribution, keeping in mind that early-winter conditions may be an important in uence on the eventual ow regime. The initial conditions were taken from the August of one year (chosen at random) of the multi-year model run A described in Gray et al (2001a). For each experiment a 20-member ensemble was generated by initializing the model with data from each of the rst 20 days of that August.…”
Section: The Modelmentioning
confidence: 99%
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