ENSO Modulation of MJO Teleconnections to the North Atlantic and Europe
ENSO Modulation of MJO Teleconnections to the North Atlantic and Europe
复制标题
DOI：
10.1029/2019gl084683
复制
发表时间：
2019-11
影响因子：
5.2
通讯作者：
Robert W. Lee;S. Woolnough;A. Charlton-Perez;F. Vitart
中科院分区：
文献类型：
--
作者：
Robert W. Lee;S. Woolnough;A. Charlton-Perez;F. Vitart
马登—朱利安涛动（MJO）的遥相关为北大西洋—欧洲（NAE）地区提供了亚季节变化和可预测性的来源。El Niño‐南方涛动（ENSO）调节季节平均状态，MJO及其遥相关模式通过季节平均状态传播；然而，它对NAE区域远程连接的影响尚未被调查。在这里，我们发现从MJO到NAE天气状态的遥相关对ENSO相位有很强的依赖性。我们发现，在El Niño年，MJO到NAO+的对流层遥相关通过增强的罗斯比波活动而得到强烈增强，而在La Niña年则受到抑制。相反，MJO与NAO -状态的平流层遥相关在La Niña年增强，而在El Niño年被抑制。这种对背景状态的依赖对亚季节可预测性有很强的影响，包括亚季节预测技能的年际变化。
The teleconnection from the Madden‐Julian Oscillation (MJO) provides a source of subseasonal variability and predictability to the North Atlantic‐European (NAE) region. The El Niño‐Southern Oscillation (ENSO) modulates the seasonal mean state, through which the MJO and its teleconnection pattern propagates; however, its impact on this teleconnection to the NAE region has not been investigated. Here we find a robust dependence of the teleconnections from the MJO to NAE weather regimes on the phase of ENSO. We show that the MJO to NAO+ regime tropospheric teleconnection is strongly enhanced during El Niño years, via enhanced Rossby wave activity, and suppressed during La Niña. Conversely, the MJO to NAO− regime stratospheric teleconnection is enhanced during La Niña years and suppressed during El Niño. This dependence on the background state has strong implications for subseasonal predictability, including interannual variations in subseasonal predictive skill.