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首页> 外文期刊>Meteorology and Atmospheric Physics >Quasi-periodic imprints in the equatorial troposphere and stratosphere in three decades of reanalysis data
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Quasi-periodic imprints in the equatorial troposphere and stratosphere in three decades of reanalysis data

机译：三十年的再分析资料在赤道对流层和平流层中的准周期印记

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摘要

Wavelet analysis is applied to zonal mean zonal wind and temperature fields to represent characteristics of temporal periodic features different from the annual and semi-annual recurrence in the troposphere and stratosphere. A daily database of reanalyses is used for the period 1979-2008, which comprises the era of satellite-based data, as some discontinuities have been observed around 1978 in previous studies. Levels for this study have been chosen at 400 and 10 hPa, respectively in the middle troposphere and middle stratosphere. As representative for diverse latitudinal regions we have respectively selected 0°, ±20°, ±40°, ±60°, ±80°. Significant features were only found at the equator. The period of the quasi-biennial oscillation (QBO) is found to exhibit a decreasing trend in time over the 30 years studied. Potential harmonics of the QBO are found in the tropical stratosphere but also troposphere. However, they do not exhibit the same tendency. This fact supports in particular the ideathat the QBO and the tropospheric biennial oscillation may be unrelated phenomena. Some of the observed features lie within the known range of variability of the El Nino Southern Oscillation. Faint effects of the 11-year solar cycle variability may havebeen observed in the troposphere and stratosphere, but no firm assertion may be made due to the low number of observed cycles for this kind of phenomenon in the used data-set time span. Short-term solar variabilities leave no relevant imprint.
机译：小波分析应用于纬向平均纬向风和温度场，以表示时间周期性特征的特征，这些特征不同于对流层和平流层中的年和半年度复发。在1979年至2008年期间，每天使用重新分析数据库，其中包括基于卫星的数据时代，因为在1978年之前的先前研究中已经观察到一些不连续性。在对流层中层和平流层中层分别选择了400 h和10 hPa进行这项研究的水平。作为不同纬度区域的代表，我们分别选择了0°，±20°，±40°，±60°，±80°。重要特征仅在赤道处发现。在研究的30年中，准双年度振荡（QBO）的时间周期呈下降趋势。在热带平流层和对流层中都发现了QBO的潜在谐波。但是，它们并没有表现出相同的趋势。这一事实尤其支持以下观点：QBO和对流层两年一次的振荡可能是不相关的现象。一些观测到的特征位于厄尔尼诺南方涛动的已知变化范围内。在对流层和平流层中可能已经观测到11年太阳周期变化的微弱影响，但是由于在所使用的数据集时间跨度中对这种现象观察到的周期数量少，因此无法做出肯定的断言。短期太阳变化没有留下任何相关的烙印。

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