Design and Validation of a Volatility Hygroscopic Tandem Differential Mobility Analyzer (VH-TDMA) to Characterize the Relationships Between the Thermal and Hygroscopic Properties of Atmospheric Aerosol Particles

Villani, Paolo; Picard, David; Michaud, V.; Laj, Paolo; Wiedensohler, Alfred

doi:10.1080/02786820802255668

Cited by 51 publications

(45 citation statements)

References 58 publications

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“…where the growth factor (GF) of fluorescein aerosol particles is measured with a Hygroscopic Tandem Differential Mobility Analyser (HTDMA, Villani et al, 2008). The measured growth factors as a function of relative humidity are presented in Fig.…”

Section: Terminal Velocity Equilibrium Axis Ratiomentioning

confidence: 99%

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An experiment to measure raindrop collection efficiencies: influence of rear capture

Quérel¹,

Lemaître

Monier

et al. 2014

Atmos. Meas. Tech.

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Abstract. In the case of severe accident with loss of containment in a nuclear plant, radionuclides are released into the atmosphere in the form of both gases and aerosol particles (Baklanov and Sørensen, 2001). The analysis of radioactive aerosol scavenged by rain after the Chernobyl accident highlights certain differences between the modelling studies and the environmental measurements. Part of these discrepancies can probably be attributed to uncertainties in the efficiencies used to calculate aerosol particle collection by raindrops, particularly drops with a diameter larger than one millimetre. In order to address the issue of these uncertainties, an experimental study was performed to close the gaps still existing for this key microphysical parameter. In this paper, attention is first focused on the efficiency with which aerosol particles in the accumulation mode are collected by raindrops with a diameter of 2 mm. The collection efficiencies measured for aerosol particle in the sub-micron range are quantitatively consistent with previous theoretical model developed by Beard (1974) and thus highlight the major role of rear capture in the submicron range.

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Section: Terminal Velocity Equilibrium Axis Ratiomentioning

confidence: 99%

“…. Growth factor (GF) of fluorescein aerosol particles measured using an HTDMA (according to Villani et al, 2008, the RH and GF uncertainties are respectively less than 1 % and 0.07).…”

Section: Aerosol Generator and Particle Characterisationmentioning

confidence: 99%

An experiment to measure raindrop collection efficiencies: influence of rear capture

Quérel¹,

Lemaître

Monier

et al. 2014

Atmos. Meas. Tech.

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“…The first HTDMA systems used passive temperature control methods (McMurry and Stolzenburg, 1989) ideally keeping their systems in air-conditioned rooms or insulating them from their surroundings (Virkkula et al, 1999), before active temperature control was introduced (Brechtel et al, 2000;Prenni et al, 2001). Present HTDMA instruments use water baths (Cubison et al, 2005;Hennig et al, 2005;, temperature controlled cabinet (Cocker III et al, 2001;Duplissy et al, 2008;Prenni et al, 2001;Villani et al, 2008) or passive, insulated regions (Johnson et al, 2008;Virkkula et al, 1999). HTDMA1 and 6 of this study had at least DMA2 operated in a temperature controlled cabinet; HTDMA3 and 4 had at least DMA2 submersed in a water bath; the DMA2 of HTDMA2 and 5 were placed in a thermally isolated environment (see Fig.…”

Section: Temperature Stabilitymentioning

confidence: 99%

Intercomparison study of six HTDMAs: results and recommendations

et al. 2009

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Abstract.We report on an intercomparison of six different hygroscopicity tandem differential mobility analysers (HTDMAs). These HTDMAs are used worldwide in laboratory experiments and field campaigns to measure the water uptake of aerosol particles and have never been intercompared. After an investigation of the different design of the instruments with their advantages and inconveniencies, the methods for calibration, validation and data analysis are presented. Measurements of nebulised ammonium sulphate as well as of secondary organic aerosol generated from a smog chamber were performed. Agreement and discrepancies between the instruments and to the theory are discussed, and final recommendations for a standard instrument are given, as a benchmark for laboratory or field experiments to ensure a high quality of HTDMA data.

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“…Submicronic PSD are detected using a Scanning Mobility Particle Sizer (SMPS, Villani et al, 2008), sizing particles in the range 10 < Dm < 500 nm. SO 2 concentrations are measured by a pulsed fluorescence gas analyzer (TEI 43CTL), while nitrogen dioxide (NO 2 ) and nitrogen monoxide (NO) are measured by ozone chemiluminescence (TEI 42CTL), O 3 with a UV analyser (TEI 49C) and CO with a IR analyser (TEI 42 TL).…”

Section: The Puy De Dôme Research Stationmentioning

confidence: 99%

Physical and optical properties of 2010 Eyjafjallajökull volcanic eruption aerosol: ground-based, Lidar and airborne measurements in France

et al. 2012

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Abstract. During the Eyjafjallajökull eruption (14 April to 24 May 2010), the volcanic aerosol cloud was observed across Europe by several airborne in situ and ground-based remote-sensing instruments. On 18 and 19 May, layers of depolarizing particles (i.e. non-spherical particles) were detected in the free troposphere above the Puy de Dôme station, (PdD, France) with a Rayleigh-Mie LIDAR emitting at a wavelength of 355 nm, with parallel and crossed polarization channels. These layers in the free troposphere (FT) were also well captured by simulations with the Lagrangian particle dispersion model FLEXPART, which furthermore showed that the ash was eventually entrained into the planetary boundary layer (PBL). Indeed, the ash cloud was then detected and characterized with a comprehensive set of in situ instruments at the Puy de Dôme station (PdD). In agreement with the FLEXPART simulation, up to 65 µg m −3 of particle mass and 2.2 ppb of SO 2 were measured at PdD, corresponding to concentrations higher than the 95 percentile of 2 yr of measurements at PdD. Moreover, the number concentration of particles increased to 24 000 cm −3 , mainly in the submicronic mode, but a supermicronic mode was also detected with a modal diameter of 2 µm. The resulting optical properties of the ash aerosol were characterized by a low scatteringÅngström exponent (0.98), showing the presence of supermicronic particles. For the first time to our knowledge, the combination of in situ optical and physical characterization of the volcanic ash allowed the calculation of the mass-to-extinction ratio (η) with no assumptions on the aerosol density. The mass-to-extinction ratio was found to be significantly different from the background boundary layer aerosol (max: 1.57 g m −2 as opposed to 0.33 ± 0.03 g m −2 ). Using this ratio, ash mass concentration in the volcanic plume derived from LIDAR measurements was found to be 655 ± 23 µg m −3 when the plume was located in the FT (3000 m above the sea level -a.s.l.).This ratio could also be used to retrieve an aerosol mass concentration of 579 ± 60 µg m −3 on 19 April, when LIDAR observations detected the ash cloud at 3000 m a.s.l. in correspondence with model simulations (FLEXPART). On 22 April, another ash plume entered the BL, and although it was more diluted than during the May episode, the French research aircraft ATR42 that passed over Clermont-Ferrand in the PBL confirmed the presence of particles with a supermicronic mode, again with a modal diameter at 2 µm.This data set combining airborne, ground-based and remote sensing observations with dispersion model simulations shows an overall very good coherence during the volcanic eruption period, which allows a good confidence in the characteristics of the ash particles that can be derived from this unique data set.Published by Copernicus Publications on behalf of the European Geosciences Union. M. Hervo et al.: Ground-based, Lidar and airborne measurements of volcanic ashes in France

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Design and Validation of a Volatility Hygroscopic Tandem Differential Mobility Analyzer (VH-TDMA) to Characterize the Relationships Between the Thermal and Hygroscopic Properties of Atmospheric Aerosol Particles

Cited by 51 publications

References 58 publications

An experiment to measure raindrop collection efficiencies: influence of rear capture

An experiment to measure raindrop collection efficiencies: influence of rear capture

Intercomparison study of six HTDMAs: results and recommendations

Physical and optical properties of 2010 Eyjafjallajökull volcanic eruption aerosol: ground-based, Lidar and airborne measurements in France

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