An evaluation of optical particle counter measurements of the dry deposition of atmospheric aerosol particles
An evaluation of optical particle counter measurements of the dry deposition of atmospheric aerosol particles
复制标题
大气气溶胶颗粒干沉积光学粒子计数器测量的评估
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
J. Hubbe
中科院分区：
文献类型：
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作者：
P. C. Katen;J. Hubbe
1982 年 6 月，在伊利诺伊州尚佩恩的草地表面收集了总大气气溶胶颗粒的涡流相关通量测量结果。使用 PMS ASAS-300A 和 Royco 225 光学粒子计数器作为传感器来测量 0.15 至 2.5 μm 四种尺寸范围的通量。通量在时间上和传感器之间变化很大。传感器信号也相当嘈杂，但我们证明，在某些限制下，传感器系统适合进行通量测量。通量测量的这种变化部分是由传感器噪声造成的，有时也可能是通过垂直湿度梯度、通量发散和颗粒浓度变化的传输的结果。然而，频繁出现的上流量表明这也可能是地表有机排放的结果。每个传感器的整体平均沉积速度为负且非常小，并且在大多数情况下不具有统计显着性。然而，日平均值通常很大且为负值，并且传感器之间表现出良好的一致性。
Eddy correlation flux measurements of total atmospheric aerosol particulates were collected over a grass surface at Champaign, Illinois, in June 1982. PMS ASAS-300A and Royco 225 optical particle counters were used as sensors to measure fluxes in four size ranges from 0.15 to 2.5 μm. The fluxes were quite variable, both in time and between sensors. The sensor signals are also quite noisy, but we demonstrate that, with certain limitations, the sensor systems are suitable for making flux measurements. This variability in the flux measurements is, in part, a result of the sensor noise and is also at times possibly the result of the transport through vertical moisture gradients, flux divergence, and changes in particulate concentration. However, frequent occurrences of upfluxes indicate it is also possibly the result of organic emissions from the surface. Ensemble average deposition velocities for each sensor were negative and quite small and, in most cases, not statistically significant. However, daily average values were often quite large and negative and showed good agreement between sensors.