Time scales of shallow‐to‐deep convective transition associated with the onset of Madden‐Julian Oscillations
Time scales of shallow‐to‐deep convective transition associated with the onset of Madden‐Julian Oscillations
复制标题
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
DOI：
10.1002/2016gl068269
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发表时间：
2016
影响因子：
5.2
通讯作者：
Rutledge, Steven A.
中科院分区：
文献类型：
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作者：
Xu, Weixin;Rutledge, Steven A.
这项研究统计调查了与印度洋上空Madden-Julian振荡（MJO）启动相关的浅到深对流转换（SDT）的时间和基本过程。结果表明，SDT周期的中位数为8-10天，宽谱为2-20天。持续10-20天的SDT发生在近50%的时间，与对流层逐渐增湿和不稳定一致，导致MJO启动，如放电-补给理论所述。在所研究的MJO中，25%发生了快速SDT（<7天），包括在MJO动力学期间观察到的两个MJO，其中先前的研究表明，在SDT期间，大规模润湿占主导地位。SDT长度仅与由真实的-时间多变量MJO指数定义的MJO振幅和持续时间弱相关。SDT长度与SDT之前的浅对流期的持续时间呈负相关，但与发病前环境相关的单个参数弱相关。
This study statistically investigates the timing and underlying processes of the shallow‐to‐deep convective transition (SDT) associated with Madden‐Julian Oscillations (MJO) initiation over the Indian Ocean. Results show that SDT periods have a median value of 8–10 days with a wide spectrum of 2–20 days. SDTs lasting 10–20 days occurred nearly 50% of the time, consistent with gradual tropospheric moistening and destabilization leading to MJO initiation as described by the discharge‐recharge theory. Rapid SDTs (<7 days) took place in 25% of the MJOs studied, including two MJOs observed during Dynamics of the MJO in which previous studies suggested large‐scale moistening dominates the local convective moistening during SDT. SDT length is only weakly correlated to MJO amplitude and duration defined by the Real‐Time Multivariate MJO index. SDT length is negatively correlated with the duration of the shallow convective period preceding the SDT but weakly correlated with individual parameters associated with preonset environments.
影响因子：
8.9
作者：
Bechtold, Peter;Koehler, Martin;Balsamo, Gianpaolo
通讯作者：
Balsamo, Gianpaolo
马登-朱利安振荡发起和传播过程中的平流、湿润以及浅层到深部的对流转变
影响因子：
6.8
作者：
S. Hagos;Zhe Feng;K. Landu;C. Long
通讯作者：
C. Long
DYNAMO 期间 TRMM 雷达观测到的印度洋降水和对流回波顶高度的演变
DOI：
10.1002/2014jd022934
发表时间：
2015
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
S. Powell;R. Houze
通讯作者：
R. Houze