Unraveling the Teleconnection Mechanisms that Induce Wintertime Temperature Anomalies over the Northern Hemisphere Continents in Response to the MJO
Unraveling the Teleconnection Mechanisms that Induce Wintertime Temperature Anomalies over the Northern Hemisphere Continents in Response to the MJO
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DOI：
10.1175/jas-d-16-0036.1
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发表时间：
2016-08
影响因子：
3.1
通讯作者：
K. Seo;Hyunju Lee;D. Frierson
中科院分区：
文献类型：
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作者：
K. Seo;Hyunju Lee;D. Frierson
摘要由于Madden-Julian振荡（MJO）引起的遥相关，导致了赤道外地面气温的显著变化。利用季节内扰动热力学方程和波活动追踪技术，阐明了北方大陆温度异常发展的详细物理过程，以响应MJO引起的加热。定量评估表明，地面空气温度的变化是由于动力学过程与对流传播的Rossby波列。在东亚，当地的Hadley环流导致绝热沉降后MJO第3阶段是一个主要的驱动程序的变暖。同时，对于北美和东欧地区来说，北风或南风的水平温度平流是增冷的关键过程。射线追踪分析表明，纬向波数为2和3的Rossby波对北美地面增温有影响。
AbstractSignificant extratropical surface air temperature variations arise as a result of teleconnections induced by the Madden–Julian oscillation (MJO). The authors elucidate the detailed physical processes responsible for the development of temperature anomalies over Northern Hemisphere continents in response to MJO-induced heating using an intraseasonal perturbation thermodynamic equation and a wave activity tracing technique. A quantitative assessment demonstrates that surface air temperature variations are due to dynamical processes associated with a meridionally propagating Rossby wave train. Over East Asia, a local Hadley circulation causes adiabatic subsidence following MJO phase 3 to be a main driver for the warming. Meanwhile, for North America and eastern Europe, horizontal temperature advection by northerlies or southerlies is the key process for warming or cooling. A ray-tracing analysis illustrates that Rossby waves with zonal wavenumbers 2 and 3 influence the surface warming over North Amer...