Excitation mechanism of intraseasonal oscillation in the equatorial mesosphere and lower thermosphere
Excitation mechanism of intraseasonal oscillation in the equatorial mesosphere and lower thermosphere
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DOI：
10.1029/2005jd006993
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发表时间：
2006-07
影响因子：
--
通讯作者：
Y. Miyoshi;H. Fujiwara
中科院分区：
文献类型：
--
作者：
Y. Miyoshi;H. Fujiwara
[1]利用大气环流模式，研究了赤道中间层和低热层纬向平均纬向风季节内振荡的激发机制。我们的结果表明，波-均流与超快开尔文波和日潮汐的相互作用是驱动季节内振荡的重要因素。无论是迁徙的日潮汐，还是非迁徙的昼夜潮汐，都对季节内振荡的激发起着重要作用。超快开尔文波和日潮汐的振幅在20~90公里高度范围内存在季节内变化，表明MLT区与低层大气之间存在动力耦合。讨论了这些波动幅度的季节内变化及其与对流层内季节振荡的关系。
[1] By using a general circulation model, excitation mechanism of intraseasonal oscillation of the zonal mean zonal wind in the equatorial mesosphere and lower thermosphere (MLT) is investigated. Our results show that wave-mean flow interaction with ultrafast Kelvin waves and diurnal tides is important for driving the intraseasonal oscillation. Not only the migrating diurnal tide but also the nonmigrating diurnal tide plays an important role in excitation of the intraseasonal oscillation. Intraseasonal variations of amplitudes of the ultrafast Kelvin waves and the diurnal tides are found at height range from 20 to 90 km heights, indicating dynamical coupling between the MLT region and the lower atmosphere. Intraseasonal variations of amplitudes of these waves and their relations with the tropospheric intraseasonal oscillation are discussed.