The Roles of Equatorial Trapped Waves and Internal Inertia–Gravity Waves in Driving the Quasi-Biennial Oscillation. Part I: Zonal Mean Wave Forcing
The Roles of Equatorial Trapped Waves and Internal Inertia–Gravity Waves in Driving the Quasi-Biennial Oscillation. Part I: Zonal Mean Wave Forcing
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DOI：
10.1175/2009jas3222.1
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
Y. Kawatani;S. Watanabe;Kaoru Sato;T. Dunkerton;S. Miyahara;M. Takahashi
中科院分区：
文献类型：
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作者：
Y. Kawatani;S. Watanabe;Kaoru Sato;T. Dunkerton;S. Miyahara;M. Takahashi
摘要利用一个高分辨率的大气环流模式T213 L256（水平分辨率60 km，垂直分辨率300 m）进行了三年的积分，研究了赤道捕获波（EQW）和重力惯性内波在驱动准两年振荡（QBO）中的作用。该模型，它不使用重力波阻力参数化，模拟QBO。虽然模拟的准两年振荡周期比真实的大气短，但它在平流层下部的振幅和结构是相当真实的。模拟输出长波辐射的纬向波数/频谱代表对流耦合EQW的现实信号。平流层风分量中也有明显的EQW信号。在准两年振荡的东风切变中，包括开尔文波在内的东向EQW对准两年振荡的驱动贡献高达25%-50%。与EQW和重力惯性内波有关的东向波强迫的峰值出现在几乎相同的时刻。
Abstract The roles of equatorial trapped waves (EQWs) and internal inertia–gravity waves in driving the quasi-biennial oscillation (QBO) are investigated using a high-resolution atmospheric general circulation model with T213L256 resolution (60-km horizontal and 300-m vertical resolution) integrated for three years. The model, which does not use a gravity wave drag parameterization, simulates a QBO. Although the simulated QBO has a shorter period than that of the real atmosphere, its amplitudes and structure in the lower stratosphere are fairly realistic. The zonal wavenumber/frequency spectra of simulated outgoing longwave radiation represent realistic signals of convectively coupled EQWs. Clear signals of EQWs are also seen in the stratospheric wind components. In the eastward wind shear of the QBO, eastward EQWs including Kelvin waves contribute up to ∼25%–50% to the driving of the QBO. The peaks of eastward wave forcing associated with EQWs and internal inertia–gravity waves occur at nearly the same t...