Calibration and intercomparison of filter-based measurements of visible light absorption by aerosols
Calibration and intercomparison of filter-based measurements of visible light absorption by aerosols
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DOI：
10.1080/027868299304435
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发表时间：
1999-06-01
影响因子：
5.2
通讯作者：
Campbell, D
中科院分区：
文献类型：
--
作者：
Bond, TC;Anderson, TL;Campbell, D
相对于全球特性描述的需要而言，关于大气颗粒物光吸收的数据很少。大多数现有的数据来自测量通过收集颗粒的过滤器的光透射变化的方法。我们提出了一个校准的最近开发的基于滤波器的连续测量光吸收的仪器（型号PSAP，辐射研究，西雅图，华盛顿州），已被纳入几个测量程序。该校准使用参考吸收，该参考吸收被确定为未改变的（悬浮的）颗粒的光消光和光散射之间的差异。此外，我们对其他两种常见的基于滤光片的方法进行了相同的校准：积分板和混合积分板系统。对于每种方法，我们评估了对颗粒光散射和颗粒光吸收的响应。我们发现，每一个仪器表现出显着的响应非吸收气溶胶和高估吸收在550 nm的悬浮颗粒约20- 30%。我们还提出了使用PSAP的校正因子。
Data on light absorption by atmospheric particles are scarce relative to the need for global characterization. Most of the existing data come from methods that measure the change in light transmission through a filter on which particles are collected. We present a calibration of a recently developed filter-based instrument for continuous measurement of light absorption (model PSAP, Radiance Research, Seattle, WA) that has been incorporated in several measurement programs. This calibration uses a reference absorption determined as the difference between light extinction and light scattering by unaltered (suspended) particles. In addition, we perform the same calibration for two other common filter-based methods: an Integrating Plate and the Hybrid Integrating Plate System, For each method, we assess the responses to both particulate light scattering and particulate light absorption. We find that each of the instruments exhibits a significant response to nonabsorbing aerosols and overestimates absorption at 550 nm by suspended particles by about 20-30 %. We also present correction factors for the use of the PSAP.