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Impact of islands on the MJO propagation across the maritime continent: a numerical modeling study of an MJO event

机译：岛屿对海洋大陆MJO传播的影响：MJO事件的数值模型研究

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摘要

A case study of the MJO event observed during January and February 2017 is conducted to understand its propagation through the Maritime Continent (MC) region. Ensemble cloud-permitting numerical simulations are performed to test the effects of the islands over MC on this MJO event. The control simulation reasonably captures the large-scale mean state, eastward propagation and diurnal cycle over islands of this MJO event. Sensitivity experiments are conducted to test the impact of topography, friction, and land-sea contrast on this MJO event. Eliminating the topography around the MC region leads to reduced precipitation over the islands while changes in eastward propagation are small. When friction is further removed, results are similar except that the low-level wind is stronger, and the MJO precipitation propagation is not essentially different. Land-sea contrast is further eliminated by replacing land with ocean, and the MJO is stronger and displays smoother eastward propagation. Diagnosis of moist static energy budget indicates that both the surface flux feedback and horizontal advection (especially the zonal advection) are greatly strengthened without land-sea contrast, which enhance the convection over the sea and facilitate the eastward propagation of the MJO.
机译：对2017年1月和2月的MJO活动进行了一个案例研究，以了解其通过海洋大陆（MC）地区的传播。进行集合允许云允许数值模拟，以测试该MJO事件对MC的岛屿对MC的影响。控制模拟合理地捕捉到这种MJO事件岛上的大规模平均状态，东方传播和昼夜周期。进行敏感性实验以测试这种MJO事件对地形，摩擦和陆海对比的影响。消除MC区域周围的地形导致岛上的降水降低，而东方传播的变化很小。当进一步除去摩擦时，除了低水平的风更强之外，结果类似，并且MJO降水传播基本上并不不同。通过用海洋替换土地，进一步消除了陆海对比，MJO更强大，并显示出畅销向东传播。潮湿静态能源预算的诊断表明，没有陆地海洋对比度大大加强了表面磁通反馈和水平平流（尤其是区域平流），从而增强了海洋的对流，促进了MJO的东方传播。

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  • 来源
    《Climate dynamics》 |2021年第10期|2921-2935|共15页
  • 作者

    Zhou Yihao; Fang Juan; Wang Shuguang;

  • 作者单位

    Nanjing Univ Sch Atmospher Sci Key Lab Mesoscale Severe Weather MOE Nanjing Peoples R China;

    Nanjing Univ Sch Atmospher Sci Key Lab Mesoscale Severe Weather MOE Nanjing Peoples R China;

    Nanjing Univ Sch Atmospher Sci Key Lab Mesoscale Severe Weather MOE Nanjing Peoples R China|Columbia Univ Dept Appl Phys & Appl Math New York NY 10027 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    MJO; Maritime continent; Barrier effect; Cloud-permitting simulation;

    机译：MJO;海事大陆;屏障效果;云允许模拟;

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