On Cold Pool Collisions in Tropical Boundary Layers

On Cold Pool Collisions in Tropical Boundary Layers
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热带边界层冷池碰撞

DOI:
10.1029/2018gl080501
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发表时间:
2019
影响因子:
5.2
通讯作者:
Kuang, Zhiming
Kuang, Zhiming
中科院分区:
地球科学1区
文献类型:
--
作者:
Torri, Giuseppe;Kuang, Zhiming

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冷池之间的碰撞通常被认为是触发新的对流单体的重要过程。然而,在详细描述这些过程的特征、量化其对冷池生命周期的影响以及将其纳入对流参数化方面所做的工作相对较少。我们使用欧拉和拉格朗日模型的组合来研究碰撞对冷池的影响程度。辐射-对流平衡模拟的结果表明,碰撞是冷池动力学的一级过程,第一次碰撞的中位数时间从冷池诞生起不到10分钟。通过拉格朗日跟踪算法,还表明冷池在碰撞后显著变形,失去了在出生后几分钟内孤立时所具有的圆形形状。最后,提出了冷池成团存在的观点,并给出了相应的空间和时间尺度。
Collisions between cold pools are generally acknowledged to be important processes through which new convective cells are triggered. Yet relatively little has been done to characterize these processes in detail, quantify their impact on the life cycle of cold pools, and include them in convective parameterizations. We use a combination of Eulerian and Lagrangian models to investigate how much cold pools are affected by collisions. Results from simulations in radiative‐convective equilibrium suggest that collisions represent a first‐order process in the dynamics of cold pools, the median time of first collision being under 10 min since cold pool birth. Through a Lagrangian tracking algorithm, it is also shown that cold pools are significantly deformed by collisions and lose the circular shapes they would have if in isolation only a few minutes after birth. Finally, it is suggested that cold pools happen in clusters, and associated spatial and temporal scales are presented.
关于冷池的大小和寿命
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发表时间: 2015
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