Southern Hemisphere Extratropical Gravity Wave Sources and Intermittency Revealed by a Middle-Atmosphere General Circulation Model
Southern Hemisphere Extratropical Gravity Wave Sources and Intermittency Revealed by a Middle-Atmosphere General Circulation Model
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DOI：
10.1175/jas-d-15-0149.1
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发表时间：
2016-02
影响因子：
3.1
通讯作者：
S. Alexander;Kaoru Sato;S. Watanabe;Y. Kawatani;D. Murphy
中科院分区：
文献类型：
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作者：
S. Alexander;Kaoru Sato;S. Watanabe;Y. Kawatani;D. Murphy
摘要利用不含重力波参数化的关东自由运行中层大气环流模式模拟南半球大气外重力波活动。在1月和7月期间，总的绝对重力波动量通量（MF）和它的不稳定性，诊断的基尼系数，检查。由Kanto模式计算的MF和不透明度结果与卫星临边观测和超压气球观测的结果吻合较好。关东模型模拟的分析表明以下结果。在关东，在对流层外低压的锋面区域和对流层顶急流周围产生了非地形重力波。7月平流层中层波动率较低（较高）的区域，由于低层波的去除，中层变得更（更少）间歇性。1月份，整个SH中层大气的重力波不透明度较低，几乎是均匀的。这表明T…
AbstractSouthern Hemisphere extratropical gravity wave activity is examined using simulations from a free-running middle-atmosphere general circulation model called Kanto that contains no gravity wave parameterizations. The total absolute gravity wave momentum flux (MF) and its intermittency, diagnosed by the Gini coefficient, are examined during January and July. The MF and intermittency results calculated from the Kanto model agree well with results from satellite limb and superpressure balloon observations. The analysis of the Kanto model simulations indicates the following results. Nonorographic gravity waves are generated in Kanto in the frontal regions of extratropical depressions and around tropopause-level jets. Regions with lower (higher) intermittency in the July midstratosphere become more (less) intermittent by the mesosphere as a result of lower-level wave removal. The gravity wave intermittency is low and nearly homogeneous throughout the SH middle atmosphere during January. This indicates t...