Intercomparison study of six HTDMAs: results and recommendations

Duplissy, Jonathan; Gysel, M.; Sjögren, S.; Meyer, Nickolas K.; Good, N.; Kammermann, L.; Michaud, V.; Weigel, Ralf; Santos, Sebastiao Martins Dos; Gruening, Carsten; Villani, Paolo; Laj, Paolo; Sellegri, Karine; Metzger, Axel; McFiggans, G.; Wehrle, G.; Richter, R.; Dommen, Josef; Ristovski, Zoran; Baltensperger, Urs; Weingärtner, E.

doi:10.5194/amt-2-363-2009

Cited by 140 publications

(170 citation statements)

References 43 publications

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“…For the nebuliser distribution the influence of multiply charged particles is generally small and will not impact measurements significantly. For the smog chamber distribution, the effect of multiple charging can be large as noted by other authors Duplissy et al, 2009). For the marine distribution we see that there are some diameters which have quite large contributions, e.g.…”

Section: Sample Charge Equilibriummentioning

confidence: 59%

“…The HTDMA operated here is described in detail by Cubison et al (2005) and Duplissy et al (2009). In summary the HTDMA uses a gore-tex humidifier to condition the aerosol sample.…”

Section: Htdma -Principle Of Operationmentioning

confidence: 99%

“…It is therefore necessary to have a procedure to correct this data for multiply charging. Duplissy et al (2009) review the instrumental parameters important to maintaining reliable HTDMA operation and data collection. The flows and temperatures in the DMAs are monitored continuously as described by (Cubison et al, 2005) to ensure they operate reliably and stably.…”

Section: Sample Charge Equilibriummentioning

confidence: 99%

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Instrumentational operation and analytical methodology for the reconciliation of aerosol water uptake under sub- and supersaturated conditions

2010

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Abstract. The methodology for the operation and calibration of a hygroscopicity tandem differential mobility analyser (HTDMA) and cloud condensation nuclei counter (CCNc) for size-resolved measurements of aerosol water uptake are presented. A state of the science aerosol thermodynamic model is used to benchmark the performance of the instruments. The performance, calibration and operation of the instruments is then demonstrated in the field.

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Section: Sample Charge Equilibriummentioning

confidence: 59%

“…The HTDMA operated here is described in detail by Cubison et al (2005) and Duplissy et al (2009). In summary the HTDMA uses a gore-tex humidifier to condition the aerosol sample.…”

Section: Htdma -Principle Of Operationmentioning

confidence: 99%

Section: Sample Charge Equilibriummentioning

confidence: 99%

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Instrumentational operation and analytical methodology for the reconciliation of aerosol water uptake under sub- and supersaturated conditions

2010

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“…Some of these problems were highlighted by recent HTDMA intercomparisons (Duplissy et al 2009;Good et al 2010;Massling et al 2011). These studies collectively show that HT-DMA RH set points and the reported growth factors can be highly uncertain.…”

Section: Introductionmentioning

confidence: 92%

Accurate Determination of Aerosol Activity Coefficients at Relative Humidities up to 99% Using the Hygroscopicity Tandem Differential Mobility Analyzer Technique

Petters

2013

Aerosol Science and Technology

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Aerosol water content plays an important role in aqueous phase reactions, in controlling visibility, and in cloud formation processes. One way to quantify aerosol water content is to measure hygroscopic growth using the hygroscopicity tandem differential mobility analyzer (HTDMA) technique. However, the HTDMA technique becomes less reliable at relative humidity (RH) >90% due to the difficulty of controlling temperature and RH inside the second DMA. For this study, we have designed and implemented a new HTDMA system with improved temperature and RH control. Temperature stability in the second DMA was achieved to ±0.02• C tolerance by implementing active control using thermoelectric heat exchangers and PID control loops. The DMA size resolution was increased by operating high-flow DMA columns at a sheath:sample flow ratio of 15:0.5. This improved size resolution allowed for improving the accuracy of the RH sensors by interspersing ammonium sulfate reference scans at high frequency. We present growth factor data for pure compounds at RH up to 99% and compare the data to theoretical values and to available bulk water activity data. With this HTDMA instrument and method, the osmotic coefficients of spherical, nonvolatile aerosols of known composition between 30 and 200 nm in diameter can be determined within ±20%. We expect that data from this instrument will lead to an improvement of aerosol water content models by contributing to the understanding of aerosol water uptake at high RH.

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“…The hygroscopicity of aerosols is frequently investigated using the hygroscopicity tandem differential mobility analyser (HTDMA, Cubison et al, 2005;Duplissy et al, 2009). In brief, the particles were dried to RH ∼20 % and sizeselected using the first DMA (dry DMA).…”

Section: Htdma-sp2 Systemmentioning

confidence: 99%

Ambient black carbon particle hygroscopic properties controlled by mixing state and composition

et al. 2013

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The wet removal of black carbon aerosol (BC) in the atmosphere is a crucial factor in determining its atmospheric lifetime and thereby the vertical and horizontal distributions, dispersion on local and regional scales, and the direct, semi-direct and indirect radiative forcing effects. The in-cloud scavenging and wet deposition rate of freshly emitted hydrophobic BC will be increased on acquisition of more-hydrophilic components by coagulation or coating processes. The lifetime of BC is still subject to considerable uncertainty for most of the model inputs, which is largely due to the insufficient constraints on the BC hydrophobic-to-hydrophilic conversion process from observational field data. This study was conducted at a site along UK North Norfolk coastline, where the BC particles were transported from different regions within Western Europe. A hygroscopicity tandem differential mobility analyser (HTDMA) was coupled with a single particle soot photometer (SP2) to measure the hygroscopic properties of BC particles and associated mixing state in real time. In addition, a Soot Particle AMS (SP-AMS) measured the chemical compositions of additional material associated with BC particles. The ensemble of BC particles persistently contained a less-hygroscopic mode at a growth factor (gf) of around 1.05 at 90% RH (dry diameter 163 nm). Importantly, a more-hygroscopic mode of BC particles was observed throughout the experiment, the gf of these BC particles extended up to ~1.4–1.6 with the minimum between this and the less hygroscopic mode at a gf ~1.25, or equivalent effective hygroscopicity parameter κ ~0.1. The gf of BC particles (gfBC) was highly influenced by the composition of associated soluble material: increases of gfBC were associated with secondary inorganic components, and these increases were more pronounced when ammonium nitrate was in the BC particles; however the presence of secondary organic matter suppressed the gfBC below that of pure inorganics. The Zdanovskii-Stokes-Robinson (ZSR) mixing rule captures the hygroscopicity contributions from different compositions within ±30% compared to the measured results, however is subject to uncertainty due to the complex morphology of BC component and potential artefacts associated with semivolatile particles measured with the HTDMA. This study provides detailed insights on BC hygroscopicity associated with its mixing state, and the results will importantly constrain the microphysical mixing schemes of BC as used by a variety of high level models. In particular, this provides direct evidence to highlight the need to consider ammonium nitrate ageing of BC particles because this will result in particles becoming hydrophilic on much shorter timescales than for sulphate formation, which is often the only mechanism considered

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Intercomparison study of six HTDMAs: results and recommendations

Cited by 140 publications

References 43 publications

Instrumentational operation and analytical methodology for the reconciliation of aerosol water uptake under sub- and supersaturated conditions

Instrumentational operation and analytical methodology for the reconciliation of aerosol water uptake under sub- and supersaturated conditions

Accurate Determination of Aerosol Activity Coefficients at Relative Humidities up to 99% Using the Hygroscopicity Tandem Differential Mobility Analyzer Technique

Ambient black carbon particle hygroscopic properties controlled by mixing state and composition

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