The Roles of Equatorial Trapped Waves and Internal Inertia–Gravity Waves in Driving the Quasi-Biennial Oscillation. Part II: Three-Dimensional Distribution of Wave Forcing
The Roles of Equatorial Trapped Waves and Internal Inertia–Gravity Waves in Driving the Quasi-Biennial Oscillation. Part II: Three-Dimensional Distribution of Wave Forcing
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DOI：
10.1175/2009jas3223.1
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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T213 L256高分辨率大气环流模式（水平分辨率60 km，垂直分辨率300 m）模拟了准两年振荡（QBO）的三维波动强迫。在QBO的向西风切变位相中，几乎所有由重力惯性内波（定义为纬向波数≥12的波动）引起的Eliassen-Palm通量（EP通量）的辐散都是由通量垂直分量的辐散引起的。另一方面，由于赤道陷波（EQWs）的EP通量散度的结果从纬向和垂直分量的通量在强垂直风切变的区域。本文还用适用于重力波的三维波活动通量研究了波浪强迫的纵向依赖性。在步行者环流顶部附近，由于重力惯性内波具有较小的水平位相，在东（西）半球产生强的东（向西）向波强迫。
Abstract Three-dimensional wave forcing of simulated quasi-biennial oscillation (QBO) is investigated using a high-resolution atmospheric general circulation model with T213L256 resolution (60-km horizontal and 300-m vertical resolution). In both the eastward and westward wind shear phases of the QBO, nearly all Eliassen–Palm flux (EP flux) divergence due to internal inertia–gravity waves (defined as fluctuations with zonal wavenumber ≥12) results from the divergence of the vertical component of the flux. On the other hand, EP flux divergence due to equatorial trapped waves (EQWs) results from both the meridional and vertical components of the flux in regions of strong vertical wind shear. Longitudinal dependence of wave forcing is also investigated by three-dimensional wave activity flux applicable to gravity waves. Near the top of the Walker circulation, strong eastward (westward) wave forcing occurs in the Eastern (Western) Hemisphere due to internal inertia–gravity waves with small horizontal phase sp...