Atmospheric River Lifecycle Responses to the Madden‐Julian Oscillation
Atmospheric River Lifecycle Responses to the Madden‐Julian Oscillation
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DOI：
10.1029/2020gl090983
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发表时间：
2021-01
影响因子：
5.2
通讯作者：
Yang Zhou;Hyemi Kim;D. Waliser
中科院分区：
文献类型：
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作者：
Yang Zhou;Hyemi Kim;D. Waliser
我们研究了马登-朱利安振荡（MJO），热带亚季节变化的主导模式，如何调节冷季北太平洋大气河流（AR）的生命周期。当增强（抑制）的对流中心位于印度洋（西太平洋）上空时，亚洲东部的AR事件较多，副热带北方太平洋的AR事件较少。当对流增强（抑制）在西太平洋（印度洋），相反的变化发生，与更多的AR事件起源于副热带北方太平洋和亚洲东部。动力学过程涉及异常MJO风和季节平均湿度被认为是影响AR起源这些变化的主导因素。MJO相关的异常位势高度模式也被证明可以调制AR事件的传播。这些MJO-AR生命周期关系得到模型模拟的进一步支持。
We investigate how the Madden‐Julian Oscillation (MJO), the dominant mode of tropical subseasonal variability, modulates the lifecycle of cool‐season North Pacific atmospheric rivers (ARs). When the enhanced (suppressed) convection center is located over the Indian Ocean (western Pacific), more AR events originate over eastern Asia and with fewer over the subtropical northern Pacific. When the enhanced (suppressed) convection is over the western Pacific (Indian Ocean), the opposite changes occur, with more AR events originate over the subtropical northern Pacific and fewer over eastern Asia. Dynamical processes involving anomalous MJO wind and seasonal mean moisture are found to be the dominant factors impacting these variations in AR origins. The MJO‐related anomalous geopotential height patterns are also shown to modulate the propagation of the AR events. These MJO–AR lifecycle relationships are further supported by model simulations.