The Role of Wave Packets in Wave–Mean Flow Interactions during Southern Hemisphere Summer
The Role of Wave Packets in Wave–Mean Flow Interactions during Southern Hemisphere Summer
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南半球夏季波包在波浪与平均流相互作用中的作用
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
E. Chang
中科院分区：
文献类型：
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作者：
E. Chang
本文对欧洲中期天气预报中心制作的14个南半球夏季再分析资料进行了分析。所有半球瞬变涡动能(TEKE)极大值的个例都已被确定，并将伴随这些TEKE消长幕的局地能量异常和行星尺度流动异常的演化合成在一起。复合能量学的经时演化显示出明显的波包特征，波包以每天约27°经度的群速度向东传播，经历了一个消长的生命周期，接近波包中心的体积内的能量学占半球平均能量学的主导地位。当考察个别情况时，发现52%类似于复合材料，并且具有由单个波包的演化主导的能量生命周期，另外21%被发现由具有相似幅度的两个波包的演化主导。只有..。
Abstract In this study, reanalysis data produced by the European Centre for Medium-Range Weather Forecasts for 14 Southern Hemisphere (SH) summer seasons have been analyzed. All cases of hemispheric transient eddy kinetic energy (TEKE) maxima have been identified, and the evolution of the local energetics and planetary-scale flow anomalies accompanying these TEKE growth/decay episodes are composited. The longitude–time evolution of the composite energetics shows the clear signature of a wave packet propagating eastward at a group velocity of about 27° longitude per day and undergoing a life cycle of growth and decay, with the energetics within a volume close to the wave packet center dominating the hemispheric mean energetics. When individual cases are examined, 52% are found to resemble the composite and have the energetics life cycle dominated by the evolution of a single wave packet, and an additional 21% are found to be dominated by the evolution of two wave packets having similar amplitudes. Only the...