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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Possible solar modulation of the equatorial quasi-biennial oscillation: Additional statistical evidence
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Possible solar modulation of the equatorial quasi-biennial oscillation: Additional statistical evidence

机译：赤道准两年一次振荡的可能太阳调制：其他统计证据

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Although the quasi-biennial oscillation (QBO) in the equatorial zonal wind is dominantly driven by wave forcing originating in the troposphere, a recent study suggests that certain properties of the QBO may vary slightly on the 11-year solar cycle timescale [Salby and Callaghan, 2000]. Here we report further statistical investigation using both equatorial wind data for levels from 50 to 1 hPa and longterm proxy solar ultraviolet flux time series (10.7-cm. solar radio flux and sunspot numbers). Spectral analysis of the solar time series yields evidence for a significant spectral peak at periods between 25 and 30 months, approximately equivalent to the mean QBO period, as had also been noted by earlier authors [Shapiro and Ward, 1962]. Cross-spectral analysis of the 10.7-cm solar radio flux and equatorial zonal wind time series shows significant coherency at the QBO period at all available pressure levels. The phase lag of the wind data relative to the solar flux at the QBO period ranges from 0-1 months near the stratopause (1 hPa) to 20-24 months in the lower stratosphere (50 hPa). The nearly inphase relationship near the stratopause suggests a possible modulation of the QBO at this level by the radiative and photochemical effects of solar ultraviolet variations. The amplitudes of the solar variations at the QBO period tend to be larger under solar maximum than under solar minimum conditions. Composite analysis of the westerly and easterly phases of the equatorial zonal wind shows subtle but consistent differences in the durations of the westerlies and easterlies between solar maximum and minimum conditions. [References: 33]
机译：尽管赤道纬向风中的准两年一次振荡（QBO）主要由对流层中的强迫强迫驱动，但最近的研究表明，在11年的太阳周期时间尺度上，QBO的某些性质可能会略有变化[Salby和Callaghan ，2000]。在这里，我们报告了使用50至1 hPa的赤道风数据和长期代理太阳紫外线通量时间序列（10.7厘米太阳辐射通量和黑子数）的进一步统计调查。太阳时间序列的光谱分析得出证据，表明在25到30个月之间存在明显的光谱峰值，大约等于平均QBO时期，正如先前的作者所指出的那样[Shapiro and Ward，1962]。对10.7厘米太阳辐射通量和赤道纬向风时间序列的跨谱分析表明，在所有可用压力水平下，QBO时期的相干性都很高。在QBO时期，风数据相对于太阳通量的相位滞后范围从平流层顶附近的0-1个月（1 hPa）到平流层下层的50-24 h的20-24个月。层状顶峰附近的几乎同相关系表明，太阳紫外线变化的辐射和光化学作用可能会在此水平上调节QBO。在QBO周期内，太阳最大时的太阳变化幅度要比太阳最小时的幅度大。对赤道纬向风的西风和东风阶段的综合分析显示，在太阳最大和最小条件之间，西风和东风的持续时间存在细微但一致的差异。 [参考：33]

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