Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations
Broadening of Cloud Droplet Spectra through Eddy Hopping: Turbulent Adiabatic Parcel Simulations
复制标题
通过涡跳拓宽云滴光谱：湍流绝热包裹模拟
DOI：
10.1175/jas-d-17-0043.1
复制
发表时间：
2017
影响因子：
3.1
通讯作者：
G. Abade
中科院分区：
文献类型：
--
作者：
W. Grabowski;G. Abade
摘要本文研究了液滴尺寸分布的光谱展宽，通过一种称为涡跳的机制。四分之一个世纪前提出的关键思想是，到达湍流云中给定位置的液滴遵循不同的轨迹，从而经历不同的增长历史，这会导致光谱显着增宽。在这项研究中，绝热包裹模型与超液滴被用来对比液滴生长和湍流。包裹内部的湍流由两个参数描述：（i）湍流动能e的耗散率和（ii）包裹的线性范围L。正如预期的那样，没有湍流的绝热包裹产生极窄的液滴光谱。在湍流包裹，一个随机计划是用来占垂直速度波动，导致局部过饱和度波动的每个超级液滴。这些波动模仿液滴跳跃湍流漩涡的影响，在一个…
AbstractThis paper investigates spectral broadening of droplet size distributions through a mechanism referred to as the eddy hopping. The key idea, suggested a quarter century ago, is that droplets arriving at a given location within a turbulent cloud follow different trajectories and thus experience different growth histories and that this leads to a significant spectral broadening. In this study, the adiabatic parcel model with superdroplets is used to contrast droplet growth with and without turbulence. Turbulence inside the parcel is described by two parameters: (i) the dissipation rate of the turbulent kinetic energy e and (ii) the linear extent of the parcel L. As expected, an adiabatic parcel without turbulence produces extremely narrow droplet spectra. In the turbulent parcel, a stochastic scheme is used to account for vertical velocity fluctuations that lead to local supersaturation fluctuations for each superdroplet. These fluctuations mimic the impact of droplets hopping turbulent eddies in a ...
影响因子：
3.1
作者：
F. Hoffmann;Y. Noh;S. Raasch
通讯作者：
F. Hoffmann;Y. Noh;S. Raasch
拉格朗日云模型中杂散云边缘过饱和的影响：分析和数值研究
影响因子：
3.2
作者：
Hoffmann
通讯作者：
Hoffmann