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首页> 外文期刊>Journal of the Meteorological Society of Japan >The Impact of Diurnal Precipitation over Sumatra Island, Indonesia, on Synoptic Disturbances and its Relation to the Madden-Julian Oscillation
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The Impact of Diurnal Precipitation over Sumatra Island, Indonesia, on Synoptic Disturbances and its Relation to the Madden-Julian Oscillation

机译：苏门答腊岛，印度尼西亚对舞蹈障碍及其与Madden-Julian振荡关系的影响

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摘要

The impact of diurnal precipitation over Sumatra Island, the Indonesian Maritime Continent (MC), on synoptic disturbances over the eastern Indian Ocean is examined using high-resolution rainfall data from the Global Satellite Mapping of Precipitation project and the Japanese 55-year Reanalysis data during the rainy season from September to April for the period 2000-2014. When the diurnal cycle is strong, the high precipitation area observed over Sumatra in the afternoon migrates offshore during nighttime and reaches 500 km off the coast on average. The strong diurnal events are followed by the development of synoptic disturbances over the eastern Indian Ocean for several days, and apparent twin synoptic disturbances straddling the equator develop only when the convective center of the Madden-Julian Oscillation (MJO) lies over the Indian Ocean (MJO-IO). Without the MJO, the synoptic disturbances develop mainly south of the equator. The differences in the locations and behaviors of active synoptic disturbances are related to the strength of mean horizontal winds in the lower troposphere. During the MJO-IO, the intensification of mean northeasterly winds in the northern hemisphere blowing into the organized MJO convection in addition to mean southeasterly winds in the southern hemisphere facilitate the formation of the twin disturbances. These results suggest that seed disturbances arising from the diurnal offshore migration of precipitation from Sumatra develop differently depending on the mean states over the eastern Indian Ocean. Furthermore, it is shown that the MJO events with the strong diurnal cycle tend to have longer duration and continuing eastward propagation of active convection across the MC, whereas the convective activities of the other MJO events weaken considerably over the MC and develop again over the western Pacific. These results suggest that the strong diurnal cycle over Sumatra facilitates the smooth eastward propagation of the intraseasonal convection across the MC.
机译：利用全球降水卫星制图项目的高分辨率降雨数据和日本2000-2014年9月至4月雨季的55年再分析数据，研究了印度尼西亚海洋大陆苏门答腊岛（MC）的日间降水对东印度洋天气扰动的影响。当日循环较强时，苏门答腊岛下午观测到的高降水区在夜间向近海移动，平均距离海岸500公里。强烈的昼间事件之后，东印度洋天气扰动持续数天，只有当马登-朱利安振荡（MJO）的对流中心位于印度洋（MJO-IO）上方时，横跨赤道的明显双天气扰动才会发展。没有MJO，天气扰动主要在赤道以南发展。活跃天气扰动位置和行为的差异与对流层下部平均水平风的强度有关。在MJO-IO期间，除了南半球的平均东南风外，北半球的平均东北风增强，吹向有组织的MJO对流，促进了孪生扰动的形成。这些结果表明，来自苏门答腊岛的降水的日间离岸迁移引起的种子干扰，根据东印度洋上的平均状态而不同。此外，研究还表明，具有强日循环的MJO事件的持续时间较长，并在MC上持续向东传播活跃对流，而其他MJO事件的对流活动在MC上显著减弱，并在西太平洋上再次发展。这些结果表明，苏门答腊岛上的强日循环有助于跨MC的季节内对流顺利向东传播。

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