FIELD STUDIES OF ATMOSPHERIC PARTICULATE CONCENTRATION CHANGES DURING PRECIPITATION
FIELD STUDIES OF ATMOSPHERIC PARTICULATE CONCENTRATION CHANGES DURING PRECIPITATION
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DOI：
10.1016/0004-6981(78)90344-x
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发表时间：
1978-01-01
影响因子：
5
通讯作者：
PETERS, LK
中科院分区：
文献类型：
--
作者：
DAVENPORT, HM;PETERS, LK
降雨对大气颗粒物浓度变化的影响进行了评估，并将这些测量结果与颗粒物冲刷系数的理论计算进行了比较。在3个单独的降水事件期间，在2个不同的时间测量在2个尺寸子范围（约0.01和1 μ m）中的累积颗粒数分布，以建立表观冲刷系数。雨滴尺寸分布和降水强度测量也得到了估计理论冲刷系数。实验洗出系数在2 × 10 - 4之间。10-5 s-1和1 ×10-4 s-1，取决于雨滴谱分布和降水强度。这些值比考虑惯性碰撞、拦截的已知单液滴收集机制的理论估计值大1-2个数量级。布朗效应、扩散效应、热泳效应、扩散泳效应和静电荷效应。这些结果表明，这些机制不能充分解释所观察到的粒子数密度在降水过程中的减少。
The effect of rain on changes in the atmospheric particulate concentration was evaluated, and these measurements were compared with theoretical calculations of particle washout coefficients. Cumulative particle number distributions in 2 size subranges, around 0.01 and 1 .mu.m, were measured at 2 different times during 3 separate precipitation events to establish apparent washout coefficients. Raindrop size distributions and precipitation intensity measurements were also obtained to estimate the theoretical washout coefficients. The experimental washout coefficients were between 2 .times. 10-5 s-1 and 1 .times. 10-4 s-1, depending on the raindrop size distributions and precipitation intensity. These values were 1-2 orders of magnitude greater than theoretical estimates that considered the known single droplet collection mechanisms of inertial impaction, interception. Brownian, diffusion, thermophoresis, diffusiophoresis and electrostatic charge effects. These results indicate that these mechanisms cannot adequately explain the observed decreases in particle number density during a precipitation event.