Influence of Microphysical Variability on Stochastic Condensation in a Turbulent Laboratory Cloud
Influence of Microphysical Variability on Stochastic Condensation in a Turbulent Laboratory Cloud
复制标题
微物理变化对实验室湍流云中随机凝结的影响
DOI：
10.1175/jas-d-17-0158.1
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发表时间：
2018
影响因子：
3.1
通讯作者：
R. Shaw
中科院分区：
文献类型：
--
作者：
N. Desai;K. K. Chandrakar;Kelken Chang;W. Cantrell;R. Shaw
摘要随机凝结导致的液滴扩散生长和由此产生的尺寸分布的扩大被认为是弥合凝结和碰撞-聚并之间的云液滴生长差距的机制。最近的研究表明，在液滴生长的凝聚阶段，过饱和波动会导致液滴尺寸分布的扩大。然而，大多数使用随机模型的研究假设云包的相松弛时间是恒定的。本文提出了两个问题：液滴数、浓度和半径的变化如何影响相弛豫时间，以及它对液滴尺寸分布的影响。为了回答这些问题，我们在实验室中创造了稳态云条件，并使用数字内联全息术直接观察局部数浓度和液滴尺寸分布的变化，从而观察积分半径。随机方程也被扩展到考虑f…
AbstractDiffusional growth of droplets by stochastic condensation and a resulting broadening of the size distribution has been considered as a mechanism for bridging the cloud droplet growth gap between condensation and collision–coalescence. Recent studies have shown that supersaturation fluctuations can lead to a broadening of the droplet size distribution at the condensational stage of droplet growth. However, most studies using stochastic models assume the phase relaxation time of a cloud parcel to be constant. In this paper, two questions are asked: how variability in droplet number concentration and radius influence the phase relaxation time and what effect it has on the droplet size distributions. To answer these questions, steady-state cloud conditions are created in the laboratory and digital inline holography is used to directly observe the variations in local number concentration and droplet size distribution and, thereby, the integral radius. Stochastic equations are also extended to account f...
影响因子：
56.9
作者：
Beals, Matthew J.;Fugal, Jacob P.;Stith, Jeffrey L.
通讯作者：
Stith, Jeffrey L.