Characteristics of inertia-gravity waves around jet stream from radiosonde observations in Wuhan (30.5°N, 114.4°E)
Characteristics of inertia-gravity waves around jet stream from radiosonde observations in Wuhan (30.5°N, 114.4°E)
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DOI：
10.1016/j.jastp.2007.01.004
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发表时间：
2007-05
影响因子：
1.9
通讯作者：
W. Li;F. Yi
中科院分区：
文献类型：
--
作者：
W. Li;F. Yi
利用2000年1月至2004年12月在武汉（30.5°N，114.4°E）连续5年的探空资料，研究了急流附近的重力惯性波行为。结果表明，波强与急流强度有相似的季节变化，冬季最大，夏季最小。波强度和急流强度的年际变化趋势相似，表明急流可能是武汉地区对流层和平流层下部5年内重力惯性波的主要来源。从冬季28条探空剖面中发现，重力惯性波能量在急流上方和急流下方分别表现为向上和向下传播。这表明惯性重力波的源在急流内。在这些情况下，急流下方和上方的孪生波通常具有相似的振幅。孪生波的水平传播也显示出一些有趣的关系。
The 5 years’ radiosonde data obtained from January 2000 to December 2004 in Wuhan (30.5°N, 114.4°E) have been used for studying the behaviors of inertia-gravity waves in the vicinity of the jet stream. It is observed that the wave intensity has a similar seasonal variation with the jet stream intensity with a strong winter maximum and a summer minimum. Moreover, a similar inter-annual trend for both the wave intensity and jet stream intensity is also found. These results suggest that the jet stream may be the predominant source of the inertia-gravity waves in the troposphere and lower stratosphere over Wuhan in the period of the 5 years. It is noticed from 28 radiosonde profiles during wintertime that the energy of inertia-gravity waves exhibits upward and downward propagation respectively above and below the jet stream. This indicates that the source of the inertia-gravity waves is within the jet stream. In these cases, the twin waves below and above the jet stream usually hold similar amplitudes. The horizontal propagation of the twin waves also shows some interesting relationship.