The Diurnal and Microphysical Characteristics of MJO Rain Events during DYNAMO
The Diurnal and Microphysical Characteristics of MJO Rain Events during DYNAMO
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DYNAMO 期间 MJO 降雨事件的日间和微物理特征
DOI：
10.1175/jas-d-18-0316.1
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发表时间：
2019
影响因子：
3.1
通讯作者：
M. D. Zuluaga
中科院分区：
文献类型：
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作者：
A. Rowe;R. Houze;S. Brodzik;M. D. Zuluaga
马登-朱利安振荡（MJO）主导热带印度洋和太平洋云量的季节内变化。被抑制的MJO时期主要包括浅对流和孤立的深对流。在过渡到活跃的MJO期间，浅云和孤立的深云在夜间增长。在活跃的MJO期间，中尺度对流系统主要发生在2-4天的降雨活动与统计上显着的清晨高峰。然而，当这些降雨事件被分成单独的活跃时期时，有些时期并不遵循平均模式，特别是11月的事件显示出下午的高峰。雷达观测到的微物理过程产生降水的主要降雨事件的活跃MJO期间的演变与天气尺度波通道与不同的影响，日强迫。MJO的研究，不占降水的活跃MJO阶段，通过平均多个事件的不稳定性可能会导致误解的主要产雨云的MJO调制完全由日周期。
The Madden–Julian oscillation (MJO) dominates the intraseasonal variability of cloud populations of the tropical Indian and Pacific Oceans. Suppressed MJO periods consist primarily of shallow and isolated deep convection. During the transition to an active MJO, the shallow and isolated deep clouds grow upscale into the overnight hours. During active MJO periods, mesoscale convective systems occur mostly during 2–4-day bursts of rainfall activity with a statistically significant early morning peak. Yet when these rain events are separated into individual active periods, some periods do not follow the mean pattern, with the November events in particular exhibiting an afternoon peak. The radar-observed microphysical processes producing the precipitation during the major rain events of active MJO periods evolve in connection with synoptic-scale wave passages with varying influences of diurnal forcing. MJO studies that do not account for the intermittency of rainfall during active MJO phases through averaging over multiple events can lead to the misimpression that the primary rain-producing clouds of the MJO are modulated solely by the diurnal cycle.