A Tandem DMA for highly temperature-stabilized hygroscopic particle growth measurements between 90% and 98% relative humidity

Hennig, T.; Maßling, Andreas; Brechtel, Fred J.; Wiedensohler, Alfred

doi:10.1016/j.jaerosci.2005.01.005

Cited by 79 publications

(79 citation statements)

References 17 publications

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“…The High Humidity Tandem Differential Mobility Analyser (HH-TDMA) was applied to measure the size-resolved hygroscopic growth factors of the ambient aerosols (initial diameters, D p , are 50, 100, 200 and 250 nm) at 90 %, 95 % and 98.5 % RH (Hennig et al, 2005). More details of the instrument and observational aerosol hygroscopic properties are described in Liu et al (2011).…”

Section: Instruments and Data Processingmentioning

confidence: 99%

A parameterization of low visibilities for hazy days in the North China Plain

et al. 2012

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Abstract. Visibility degradation is a pervasive and urgent environmental problem in China. The occurrence of low visibility events is frequent in the North China Plain, where the aerosol loading is quite high and aerosols are strongly hygroscopic. A parameterization of light extinction (K ex ) for low visibilities on hazy days is proposed in this paper, based on visibility, relative humidity (RH), aerosol hygroscopic growth factors and particle number size distributions measured during the Haze in China (HaChi) Project. Observational results show that a high aerosol volume concentration is responsible for low visibility at RH <90 %; while for RH >90 %, decrease of visibility is mainly influenced by the increase of RH. The parameterization of K ex is developed on the basis of aerosol volume concentrations and RH, taking into accounts the sensitivity of visibility to the two factors and the availability of corresponding data. The extinction coefficients calculated with the parameterization schemes agree well with the directly measured values.

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Section: Instruments and Data Processingmentioning

confidence: 99%

A parameterization of low visibilities for hazy days in the North China Plain

et al. 2012

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“…During the whole period of the campaign, a high humidity tandem differential mobility analyser (HHTDMA, Hennig et al, 2005) was used to measure the hygroscopic growth factor (GF) at relative humidities of 90 %, 95 % and 98.5 % for particles with dry diameters of 50 nm, 100 nm, 200 nm and 250 nm, respectively. More details on the HHTDMA measurement can be found in Liu et al (2011).…”

Section: Diurnal Variation Of Lac Mixing State: a Case Studymentioning

confidence: 99%

“…In recent years, Tandem DMAbased techniques were widely applied in aerosol measurements. A high humidity tandem DMA (Hennig et al, 2005) can provide size-resolved fractions of externally mixed hydrophobic particles , while a volatility tandem DMA can be used to yield size-resolved fractions of particles with different volatility that usually indicate different mixing states of LAC Cheng et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions

Zhao

Müller

et al. 2012

Atmos. Chem. Phys.

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Abstract. In this paper, the mixing state of light absorbing carbonaceous (LAC) was investigated with a two-parameter aerosol optical model and in situ aerosol measurements at a regional site in the North China Plain (NCP). A closure study between the hemispheric backscattering fraction (HBF) measured by an integrating nephelometer and that calculated with a modified Mie model was conducted. A new method was proposed to retrieve the ratio of the externally mixed LAC mass to the total mass of LAC (r ext-LAC ) based on the assumption that the ambient aerosol particles were externally mixed and consisted of a pure LAC material and a core-shell morphology in which the core is LAC and the shell is a less absorbing material. A Monte Carlo simulation was applied to estimate the overall influences of input parameters of the algorithm to the retrieved r ext-LAC . The diurnal variation of r ext-LAC was analyzed and the PartMC-MOSAIC model was used to simulate the variation of the aerosol mixing state. Results show that, for internally mixed particles, the assumption of core-shell mixture is more appropriate than that of homogenous mixture which has been widely used in aerosol optical calculations. A significant diurnal pattern of the retrieved r ext-LAC was found, with high values during the daytime and low values at night. The consistency between the retrieved r ext-LAC and the model results indicates that the diurnal variation of LAC mixing state is mainly caused by the diurnal evolution of the mixing layer.

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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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A Tandem DMA for highly temperature-stabilized hygroscopic particle growth measurements between 90% and 98% relative humidity

Cited by 79 publications

References 17 publications

A parameterization of low visibilities for hazy days in the North China Plain

A parameterization of low visibilities for hazy days in the North China Plain

A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions

Intercomparison study of six HTDMAs: results and recommendations

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