A Ubiquitous Wavenumber-5 Anomaly in the Southern Hemisphere During FGGE
A Ubiquitous Wavenumber-5 Anomaly in the Southern Hemisphere During FGGE
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FGGE 期间南半球普遍存在的 5 波异常
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发表时间：
1982
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通讯作者：
M. Salby
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作者：
M. Salby
摘要在FGGE夏季月份，南半球平流层低层温度场的主要波数为5型。这些五角形的特点，广泛的纬度范围，似乎保持准静止或向东传播的周期的顺序或10天。在夏季的统计确认存在大振幅波数-5异常的位势场。在50°S和300 mb的对流层急流核心附近，磁层高度振幅出现在第5波的纬向谱中。平流层低层温度异常的增强不仅是由于波数5的位势振幅的放大，而且也是由于急流上方的波数5的急剧瞬逝。时间序列分析表明，均方根幅度的峰值主要来自波动的贡献。波数5的瞬态分量显示出有规律的东向相位进展。地球势功率谱表现出明显的峰值，对应的东…
Abstract Predominant wavenumber-5 patterns frequent the temperature fields of the lower stratosphere of the Southern Hemisphere during the summer months of FGGE. These pentagonal features, of broad latitudinal extent, appear to remain quasi-stationary or propagate eastward with periods on the order or 10 days. Ensemble statistics over the summer season confirm the presence of large-amplitude wavenumber-5 anomalies in the geopotential fields. Magnified height amplitudes appear in the zonal spectra at wave 5, near the tropospheric jet core: 50°S and 300 mb. The enhanced temperature anomalies in the lower stratosphere arise not only from the magnified geopotential amplitude of wavenumber 5, but also from its sharp evanescence above the jet. Time series analysis reveals that the peak in rms amplitude results primarily from the fluctuating contribution. The transient component of wavenumber 5 shows a regular eastward phase progression. Geopotential power spectra exhibit a pronounced peak, corresponding to east...