MJO Initiation Processes over the Tropical Indian Ocean during DYNAMO/CINDY2011*
MJO Initiation Processes over the Tropical Indian Ocean during DYNAMO/CINDY2011*
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DOI：
10.1175/jcli-d-14-00328.1
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发表时间：
2015-03
影响因子：
4.9
通讯作者：
Tim Li;Chongbo Zhao;P. Hsu;T. Nasuno
中科院分区：
文献类型：
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作者：
Tim Li;Chongbo Zhao;P. Hsu;T. Nasuno
摘要2011年下半年在赤道印度洋（IO）开展了一项名为“2011年MJO/印度洋季节内变率合作实验动力学”（DynamicsofMJO/CooperativeIndianOcean Experiment onIntrasesonal Variability in Year 2011，简称CINDY 2011）的多国联合实地活动。在活动期间，从10月中旬到12月中旬发生了两次强烈的MJO事件（分别称为MJO I和MJO II）。这两次事件都发生在赤道西印度洋（WIO）50°-60 ° E附近。使用多个观测数据产品（ERA-Interim，ECMWF最终分析和NASA MERRA），作者揭示了触发WIO中MJO对流的具体过程。结果表明，在MJO I爆发前10天，西印度洋对流层低层出现了明显的大尺度上升运动异常。造成这种季节内垂直运动异常的原因是由于在北方IO上空的气旋性环流异常引起的异常暖平流。在MJO II启动之前，有一个低水平的具体…
AbstractA multination joint field campaign called the Dynamics of MJO/Cooperative Indian Ocean Experiment on Intraseasonal Variability in Year 2011 (DYNAMO/CINDY2011) took place in the equatorial Indian Ocean (IO) in late 2011. During the campaign period, two strong MJO events occurred from the middle of October to the middle of December (referred to as MJO I and MJO II, respectively). Both the events were initiated over the western equatorial Indian Ocean (WIO) around 50°–60°E. Using multiple observational data products (ERA-Interim, the ECMWF final analysis, and NASA MERRA), the authors unveil specific processes that triggered the MJO convection in the WIO. It is found that, 10 days prior to MJO I initiation, a marked large-scale ascending motion anomaly appeared in the lower troposphere over the WIO. The cause of this intraseasonal vertical motion anomaly was attributed to anomalous warm advection by a cyclonic gyre anomaly over the northern IO. The MJO II initiation was preceded by a low-level specifi...