Turbulent Diffusion of Heavy Particles in the Atmosphere
Turbulent Diffusion of Heavy Particles in the Atmosphere
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DOI：
10.1175/1520-0469(1963)020
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发表时间：
1963-05
影响因子：
3.1
通讯作者：
G. Csanady
中科院分区：
文献类型：
--
作者：
G. Csanady
摘要 本文讨论了通过定点仪器（“绝对”扩散）观察到的大气中气态物质和颗粒物扩散之间可能存在的差异。 “惯性效应”（这将导致重粒子不参与其流体粒子邻域的高频振荡）的潜在复杂因素在大气中被证明可以忽略不计。另一方面，这里称为“交叉轨迹效应”和“连续性效应”的两种相互关联的效应可能具有重大的实际意义。两者都是由重粒子相对快速地穿过大气涡流引起的，并且都可能导致分散率明显降低。本文给出了对这些影响的可能程度的一些估计。
Abstract This paper discusses the likely differences between the diffusion of gaseous and particulate matter in the atmosphere, as would be observed by fixed point instruments (“absolute” diffusion). The potential complicating factor of an “inertia effect” (which would cause a heavy particle not to participate in the higher-frequency oscillations of its fluid-particle neighborhood) is shown to be negligible in the atmosphere. Two interrelated effects termed here the “effect of crossing trajectories” and the “continuity effect,” could be, on the other hand, of great practical importance. Both are caused by the relatively rapid travel of heavy particles across the atmospheric eddies and both could result in an appreciable reduction of dispersion rates. Some estimates of the likely magnitude of these effects are given in the paper.