Successive MJO propagation in MERRA‐2 reanalysis
Successive MJO propagation in MERRA‐2 reanalysis
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MERRA-2 再分析中的连续 MJO 传播
DOI：
10.1002/2017gl073399
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发表时间：
2017
影响因子：
5.2
通讯作者：
S. Powell
中科院分区：
文献类型：
--
作者：
S. Powell
美国宇航局现代研究和应用再分析（MERRA-2）再分析版本2中的复合环绕Madden-Julian振荡（MJO）事件在西半球传播为对流耦合开尔文波，在暖池上传播为Adames和Kim（2016）所描述的水分波。通过确定波所经历的“有效静稳定性”，计算了热带耦合开尔文波的估计纬向可变相速度。该波的结构类似于经典的对流层深层开尔文波，在北半球冬季，其相速度在中/东太平洋或大西洋/赤道非洲分别高达33 m s-1或40 m s-1。理论上，热带暖池上空对流耦合开尔文波的相速度估计大于15 m s-1，比重新分析的MJO传播快得多。一个完整的理论MJO传播周围的地球仪必须允许耦合开尔文波和水分波。
Composite circumnavigating Madden‐Julian oscillation (MJO) events in Version 2 of the NASA Modern Era Reanalysis for Research and Applications (MERRA‐2) reanalysis propagate as convectively coupled Kelvin waves over the Western Hemisphere and moisture waves like that described by Adames and Kim (2016) over the warm pool. Estimated zonally variable phase speeds of coupled Kelvin waves in the tropics are calculated by determining the “effective static stability” experienced by the wave. The wave is structured similarly to a classically derived deep tropospheric Kelvin wave, and its phase speed is up to 33 m s−1 or 40 m s−1 over the central/eastern Pacific or Atlantic/equatorial Africa, respectively, during boreal winter. Theoretically, estimated phase speeds of convectively coupled Kelvin waves over the tropical warm pool are greater than 15 m s−1, much faster than the propagation of the reanalyzed MJO. A complete theory for MJO propagation around the globe must allow both coupled Kelvin waves and moisture waves.
与马登朱利安振荡爆发相关的浅层到深层对流转变的时间尺度
影响因子：
5.2
作者：
Xu, Weixin;Rutledge, Steven A.
通讯作者：
Rutledge, Steven A.