Multiangle Light-Scattering Measurements of Refractive Index of Submicron Atmospheric Particles

Dick, William D.; Ziemann, Paul J.; McMurry, Peter H.

doi:10.1080/02786820701272012

Cited by 47 publications

(33 citation statements)

References 54 publications

(85 reference statements)

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“…In this case the error estimation method shown above still applies, but the full range of indices of refraction must be taken into account. We note that the three examples given above (DOS, AS, and BC) represent the lower, mid, and upper values of IOR in the real world (Dick and McMurry 2007). The only exception is water, whose IOR is about 1.34.…”

Section: ¡1mentioning

confidence: 99%

A light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements

Gao

Telg

McLaughlin

et al. 2015

Aerosol Science and Technology

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NEW GENERATION OF AEROSOL INSTRUMENTATION FOR DISTRIBUTED OR PERSONAL SAMPLINGA light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements A light-weight, low-cost optical particle spectrometer for measurements of aerosol number concentrations and size distributions has been designed, constructed, and demonstrated. The spectrometer is suitable for use on small, unmanned aerial vehicles (UAVs) and in balloon sondes. The spectrometer uses a 405 nm diode laser to count and size individual particles in the size range 140-3000 nm. A compact data system combines custom electronics with a single-board commercial computer. Power consumption is 7W at 9-15 V. 3D printing technology was used in the construction of the instrument to reduce cost, manufacturing complexity, and weight. The resulting Printed Optical Particle Spectrometer (POPS) instrument weighs about 800 g with an approximate materials cost of 2500 USD. Several POPS units have been constructed, tested in the laboratory, and deployed on UAVs. Here we present an overview of the instrument design and construction, laboratory validation data, and field engineering data for POPS.

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Section: ¡1mentioning

confidence: 99%

A light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements

Gao

Telg

McLaughlin

et al. 2015

Aerosol Science and Technology

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“…The refractive index of PSL is 1.588. Organic particles tend to have a lower refractive index (Dick et al, 2007). Accurately sizing particles with a different refractive index requires scaling the bin bounds.…”

Section: Instrumentsmentioning

confidence: 99%

Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products

Coleman

Lunden

Destaillats

et al. 2008

Atmospheric Environment

124

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We analyzed secondary organic aerosol (SOA) data from a series of small-chamber experiments in which terpene-rich vapors from household products were combined with ozone under conditions analogous to product use indoors. Reagents were introduced into a continuously ventilated 198 L chamber at steady rates. Consistently, at the time of ozone introduction, nucleation occurred exhibiting behavior similar to atmospheric events. The initial nucleation burst and growth was followed by a period in which approximately stable particle levels were established reflecting a balance between new particle formation, condensational growth, and removal by ventilation. Airborne particles were measured with a scanning mobility particle sizer (SMPS, 10 to 400 nm) in every experiment and with an optical particle counter (OPC, 0.1 to 2.0 µm) in a subset. Parameters for a three-mode lognormal fit to the size distribution at steady state were determined for each experiment. Increasing the supply ozone level increased the steadystate mass concentration and yield of SOA from each product tested. Decreasing the airexchange rate increased the yield. The steady-state fine-particle mass concentration (PM 1.1 ) ranged from 10 to > 300 µg m -3 and yields ranged from 5% to 37%. Steady-state nucleation rates and SOA mass formation rates were on the order of 10 cm -3 s -1 and 10 µg m -3 min -1 , respectively.

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“…The given volume fractions assume "typical" aerosol composition for those atmospheric regions where most of the CARIBIC measurements were conducted. The refractive indices for the different aerosol compounds are taken from Toon et al (1976), Hummel et al (1988), Krekov (1993), Bond and Bergstrom (2006) and Dick et al (2007). Mixed complex refractive index and particle density are calculated using volume mixing rules.…”

Section: The New Caribic Optical Particle Countermentioning

confidence: 99%

CARIBIC aircraft measurements of Eyjafjallajökull volcanic clouds in April/May 2010

Rauthe-Schöch¹,

Weigelt

Hermann

et al. 2012

Atmos. Chem. Phys.

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The Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Container (CARIBIC) project investigates physical and chemical processes in the Earth's atmosphere using a Lufthansa Airbus long-distance passenger aircraft. After the beginning of the explosive eruption of the Eyjafjallajökull volcano on Iceland on 14 April 2010, the first CARIBIC volcano-specific measurement flight was carried out over the Baltic Sea and Southern Sweden on 20 April. Two more flights followed: one over Ireland and the Irish Sea on 16 May and the other over the Norwegian Sea on 19 May 2010. During these three special mission flights the CARIBIC container proved its merits as a comprehensive flying laboratory. The elemental composition of particles collected over the Baltic Sea during the first flight (20 April) indicated the presence of volcanic ash. Over Northern Ireland and the Irish Sea (16 May), the DOAS system detected SO<sub>2</sub> and BrO co-located with volcanic ash particles that increased the aerosol optical depth. Over the Norwegian Sea (19 May), the optical particle counter detected a strong increase of particles larger than 400 nm diameter in a region where ash clouds were predicted by aerosol dispersion models. Aerosol particle samples collected over the Irish Sea and the Norwegian Sea showed large relative enhancements of the elements silicon, iron, titanium and calcium. Non-methane hydrocarbon concentrations in whole air samples collected on 16 and 19 May 2010 showed a pattern of removal of several hydrocarbons that is typical for chlorine chemistry in the volcanic clouds. Comparisons of measured ash concentrations and simulations with the FLEXPART dispersion model demonstrate the difficulty of detailed volcanic ash dispersion modelling due to the large variability of the volcanic cloud sources, extent and patchiness as well as the thin ash layers formed in the volcanic clouds

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Multiangle Light-Scattering Measurements of Refractive Index of Submicron Atmospheric Particles

Cited by 47 publications

References 54 publications

A light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements

A light-weight, high-sensitivity particle spectrometer for PM2.5 aerosol measurements

Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products

CARIBIC aircraft measurements of Eyjafjallajökull volcanic clouds in April/May 2010

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