The Global Atmospheric Circulation Response to Tropical Diabatic Heating Associated with the Madden–Julian Oscillation during Northern Winter
The Global Atmospheric Circulation Response to Tropical Diabatic Heating Associated with the Madden–Julian Oscillation during Northern Winter
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DOI：
10.1175/2011jas3686.1
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发表时间：
2012-01
影响因子：
3.1
通讯作者：
K. Seo;S. Son
中科院分区：
文献类型：
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作者：
K. Seo;S. Son
摘要通过对原始方程模式的积分，研究了对流层上层环流对Madden-Julian振荡(MJO)对流响应的详细动力机制。通过一系列初值计算，成功地捕捉到了观测到的大气环流对MJO对流的响应。这表明MJO环流异常的很大一部分是热带和温带热带加热的直接响应，可以用线性动力学来解释。研究发现，由于赤道Kelvin波和Rossby波的相互作用，类似MJO的偶极子加热不仅加强了热带上对流层异常，而且在某些地区减弱了热带上对流层异常。Rossby波列主要由高空扰动气流的水平辐散激发，向东北传播，然后返回赤道。通过这种方式，罗斯比波表演..。
AbstractThe detailed dynamical mechanisms of the upper-tropospheric circulation response to the Madden–Julian oscillation (MJO) convection are examined by integrating a primitive equation model. A series of initial-value calculations with the climatological boreal winter background flow forced by the MJO-like thermal forcing successfully capture the key aspects of the observed circulation response to the MJO convection. This suggests that a large fraction of MJO-related circulation anomalies are direct responses to tropical heating in both the tropics and extratropics and can be largely explained by linear dynamics.It is found that MJO-like dipole heatings not only intensify tropical upper-tropospheric anomalies but also weaken them at certain regions because of the interaction between equatorial Kelvin and Rossby waves. The Rossby wave train primarily excited by horizontal divergence of upper-level perturbation flow propagates northeastward and then heads back to the equator. In this way, Rossby wave act...