The Influence of the Quasi-Biennial Oscillation on the Troposphere in Winter in a Hierarchy of Models. Part II: Perpetual Winter WACCM Runs
The Influence of the Quasi-Biennial Oscillation on the Troposphere in Winter in a Hierarchy of Models. Part II: Perpetual Winter WACCM Runs
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DOI：
10.1175/2011jas3702.1
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发表时间：
2011-09
影响因子：
3.1
通讯作者：
C. Garfinkel;D. Hartmann
中科院分区：
文献类型：
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作者：
C. Garfinkel;D. Hartmann
利用全大气群落气候模式（WACCM）的试验研究了平流层热带准两年振荡（QBO）对对流层的影响。热成风平衡中的纬向对称环流与准两年振荡影响着整个对流层外的高频涡旋。QBO的影响是最强的，最强大的喷流出口区附近的北太平洋，在协议的观测。平流层极涡的变化似乎不能解释模型中对流层QBO的影响，尽管它确实有助于北大西洋的响应。与QBO相关的热带深对流的异常似乎是阻尼，而不是驱动，在对流层外的QBO的效果。相反，QBO调制对流层外的关键机制似乎是对流层瞬态波与热成风中的轴对称环流的相互作用。
AbstractExperiments with the Whole Atmosphere Community Climate Model (WACCM) are used to understand the influence of the stratospheric tropical quasi-biennial oscillation (QBO) in the troposphere. The zonally symmetric circulation in thermal wind balance with the QBO affects high-frequency eddies throughout the extratropical troposphere. The influence of the QBO is strongest and most robust in the North Pacific near the jet exit region, in agreement with observations. Variability of the stratospheric polar vortex does not appear to explain the effect of the QBO in the troposphere in the model, although it does contribute to the response in the North Atlantic. Anomalies in tropical deep convection associated with the QBO appear to damp, rather than drive, the effect of the QBO in the extratropical troposphere. Rather, the crucial mechanism whereby the QBO modulates the extratropical troposphere appears to be the interaction of tropospheric transient waves with the axisymmetric circulation in thermal wind ...