A Simple Model of the Life Cycle of Mesoscale Convective Systems Cloud Shield in the Tropics
A Simple Model of the Life Cycle of Mesoscale Convective Systems Cloud Shield in the Tropics
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DOI：
10.1175/jcli-d-16-0556.1
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发表时间：
2017-05
影响因子：
4.9
通讯作者：
R. Roca;T. Fiolleau;D. Bouniol
中科院分区：
文献类型：
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作者：
R. Roca;T. Fiolleau;D. Bouniol
摘要中尺度对流系统（MCSs）对热带气候的水和能量收支具有重要意义，是热带环流的重要组成部分。在卫星红外地球静止图像中，mcs很容易被观测到，它们是随着时间的推移，从小型结构演变为组织良好的大型云屏蔽块，然后消散。MCS云屏蔽是中尺度动力学、热力学和微物理过程综合作用的结果。研究表明，一个简单的参数化模型可以概括MCS生命周期内云屏蔽形态特征的时间演化。它由云屏蔽的生长衰减线性模型组成，基于三个参数：最大范围时间、最大范围时间和MCS持续时间。结果表明，在热带地区，极大值出现的时间往往接近生命周期的中期，极大值范围与持续时间的相关性在整个热带地区都很强。
AbstractMesoscale convective systems (MCSs) are important to the water and energy budget of the tropical climate and are essential ingredients of the tropical circulation. MCSs are readily observed in satellite infrared geostationary imagery as cloud clusters that evolve in time from small structures to well-organized large patches of cloud shield before dissipating. The MCS cloud shield is the result of a large ensemble of mesoscale dynamical, thermodynamical, and microphysical processes. This study shows that a simple parametric model can summarize the time evolution of the morphological characteristics of the cloud shield during the life cycle of the MCS. It consists of a growth–decay linear model of the cloud shield and is based on three parameters: the time of maximum extent, the maximum extent, and the duration of the MCS. It is shown that the time of maximum is frequently close to the middle of the life cycle and that the correlation between maximum extent and duration is strong all over the tropic...