Response Characteristics of the Particle Measuring Systems Active Scattering Aerosol Spectrometer Probe (ASASP–X)

Garvey, Dennis M.; Pinnick, Ronald G.

doi:10.1080/02786828308958651

Cited by 120 publications

(79 citation statements)

References 3 publications

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“…Prior studies have reported the refractive index for nigrosin aerosol in the visible spectral region (Garvey and Pinnick, 1983;Lack et al, 2006;Flores et al, 2009;Lang-Yona et al, 2009;Bluvshtein et al, 2012). The reported values are generally consistent: 1.67 + 0.26i at 633 nm (Garvey and Pinnick, 1983); 1.70 (±0.04) + 0.31 (±0.05)i at 532 nm (Lack et al, 2006); 1.649 (±0.007) + 0.238 (±0.008)i at 532 nm (Dinar et al, 2008) …”

Section: Comparison Of Nigrosin Refractive Index To Published Values supporting

confidence: 64%

Broadband measurements of aerosol extinction in the ultraviolet spectral region

et al. 2013

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Aerosols influence the Earth's radiative budget by scattering and absorbing incoming solar radiation. The optical properties of aerosols vary as a function of wavelength, but few measurements have reported the wavelength dependence of aerosol extinction cross sections and complex refractive indices. We describe a new laboratory instrument to measure aerosol optical extinction as a function of wavelength, using cavity enhanced spectroscopy with a broadband light source. The instrument consists of two broadband channels which span the 360–390 and 385–420 nm spectral regions using two light emitting diodes (LED) and a grating spectrometer with charge-coupled device (CCD) detector. We determined aerosol extinction cross sections and directly observed Mie scattering resonances for aerosols that are purely scattering (polystyrene latex spheres and ammonium sulfate), slightly absorbing (Suwannee River fulvic acid), and strongly absorbing (nigrosin dye). We describe an approach for retrieving refractive indices as a function of wavelength from the measured extinction cross sections over the 360–420 nm wavelength region. The retrieved refractive indices for PSL and ammonium sulfate agree within uncertainty with the literature values for this spectral region. The refractive index determined for nigrosin is 1.78 (± 0.03) + 0.19 (± 0.08)i at 360 nm and 1.63 (± 0.03) + 0.21 (± 0.05)i at 420 nm. The refractive index determined for Suwannee River fulvic acid is 1.71 (± 0.02) + 0.07 (± 0.06)i at 360 nm and 1.66 (± 0.02) + 0.06 (± 0.04)i at 420 nm. These laboratory results support the potential for a field instrument capable of determining ambient aerosol optical extinction, average aerosol extinction cross section, and complex refractive index as a function of wavelength

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Section: Comparison Of Nigrosin Refractive Index To Published Values supporting

confidence: 64%

Broadband measurements of aerosol extinction in the ultraviolet spectral region

et al. 2013

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“…In a previous aerosol study (Garvey and Pinnick 1983), the refractive index of pure nigrosin was taken to be 1.67-0.26i . Water solutions of pure nigrosin, pure ammonium sulfate, and various mixtures of the two were nebulized using bubblers, as shown in Figure 5.…”

Section: T C Bond Et Almentioning

confidence: 99%

Calibration and Intercomparison of Filter-Based Measurements of Visible Light Absorption by Aerosols

Bond¹,

Anderson²,

Campbell³

1999

Aerosol Science and Technology

978

1,236

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ABSTRACT. 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 lter on which particles are collected. We present a calibration of a recently developed lter-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 lter-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 nd that each of the instruments exhibits a signi cant 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.

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“…In this case, the mobility diameter and mass equivalent diameter are identical, because nigrosin particles are spherical. C * abs (λ) was calculated using Mie theory for n = 1.70 -0.30i (Lack et al 2006) and n = 1.67 -0.26i (Garvey and Pinnick 1983) at λ = 565 nm and is shown in Figure 11 for comparison. C abs (λ) was much larger than C * abs (λ), especially at D nigrosin smaller than 300 nm.…”

Section: Size Dependence Of C Abs () For Nigrosinmentioning

confidence: 99%