Wavelength dependent mass-specific optical absorption coefficients of laser generated coal aerosols determined from multi-wavelength photoacoustic measurements

Ajtai, Tibor; Filep, Ágnes; Kecskeméti, Gabriella; Hopp, B.; Bozóki, Zoltán; Szabó, Gábor

doi:10.1007/s00339-010-6068-3

Cited by 24 publications

(24 citation statements)

References 33 publications

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“…By some sample calculations for externally mixed, internally mixed and shell-core configurations of BC, Jacobson (2000) showed that in spite of difference in calculated absorption coefficient, the wavelength dependence remains nearly similar for different cases for the spectral region of 0.45- 0.1 µm. As α abs can be an indicator of aerosol composition (Park et al, 2006;Ajtai et al, 2010), the almost similar wavelength dependence (α abs ~1) in all seasons at Agartala possibly indicates the presence of aerosol compositions originating from a common source in all seasons. The above discussions thus indicate the signature of fossil fuel combustion being the dominating source of EBC in this region.…”

Section: åNgström Absorption Coefficientsmentioning

confidence: 86%

Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Guha

Dhar

et al. 2015

Aerosol Air Qual. Res.

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This study presents the characteristics of aerosol black carbon (BC) from a rural continental site, Agartala, located in the North-Eastern part of India using two year measurements from September 2010 to September 2012. Diurnal and seasonal variations are examined in relation to the unique geographical location, changeable meteorological conditions and distinct source characteristics. Winter season is characterized by extremely high BC concentration (17.8 ± 9.2 µg/m 3 ) comparable to those seen in urban environments of India, dropping off to much lower values during the monsoon (2.8 ± 1.7 µg/m 3 ). Even this lowest seasonal mean is rather high, given the rural nature of Tripura. Examination of the spectral dependence of aerosol absorption coefficients indicates that the main source of aerosol to total BC burden at Agartala is the fossil fuel combustions. Concentration weighted trajectory (CWT) analysis indicate that the characteristic high BC during winter is mostly associated with the advection from the Indo-Gangetic Plains (IGP), while the air mass pattern is constricted to the oceanic region during monsoon making BC aloft due to local pollution only.

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Section: åNgström Absorption Coefficientsmentioning

confidence: 86%

Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Guha

Dhar

et al. 2015

Aerosol Air Qual. Res.

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“…6). As a target material, not only graphite but coal samples can be used, for example, as was already demonstrated before (Ajtai et al, 2010). This gives further flexibility for the generation method.…”

Section: Discussionmentioning

confidence: 98%

“…The sample was placed and irradiated in an ablation chamber (Fig. 1), which was a modified version of a PLD (pulsed laser deposition) chamber described in detail earlier (Ajtai et al, 2010;Hopp et al, 2012). The cylindrically shaped ablation chamber was made of stainless steel with an inner diameter and length of 3 and 10 cm, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

et al. 2015

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Abstract. In this work various microphysical properties including mass concentration, size distribution and morphology of aerosol particles generated by laser ablation of a high purity graphite sample were investigated in detail. Supplementary chemical analysis of the generated particles including microstructure investigation by high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy were also made. These measurements proved that the proposed method can be used to model the real atmospheric carbonaceous particulate under various climate relevant conditions regarding its specific properties investigated here. However, to introduce the presented methodology as a novel BC surrogate, further improvement and investigation including simplification in experimental setup, comprehensive analysis of thermochemical refractiveness and optical responses of the generated particles as well as comparative study with the presently available concurrent surrogates are required. The related results of these issues are planned to be demonstrated in other studies.

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“…The photoacoustic (PA) measurement technique has already proved its applicability under laboratory and field conditions in case of strongly absorbing aerosol components such as black carbon, brown carbon and HULIS (humiclike substances) (Andreae and Gelencsér, 2008;Cappa et al, 2008;Lack et al, 2012;Chakrabarty et al, 2010;Moosmüller et al, 2012;Ajtai et al, 2010;Utry et al, 2014). The accuracy of the method stems from both its scattering insensitivity and its filter-free sampling (measurement made on the aerosol on its natural, suspended state) (Andreae, 2001).…”

Section: Introductionmentioning

confidence: 99%

Mass-specific optical absorption coefficients and imaginary part of the complex refractive indices of mineral dust components measured by a multi-wavelength photoacoustic spectrometer

et al. 2015

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Abstract. Mass-specific optical absorption coefficients (MACs) and the imaginary part (κ) of the refractive indices of various mineral dust components including silicate clays (illite, kaolin and bentonite), oxides (quartz, hematite and rutile), and carbonate (limestone) were determined at the wavelengths of 1064, 532, 355 and 266 nm. The MAC values were calculated from aerosol optical absorption coefficients measured by a multi-wavelength photoacoustic (PA) instrument, the mass concentration and the number size distribution of the generated aerosol samples as well as the size transfer functions of the measuring instruments. Values of κ were calculated from the measured and particle-loss-corrected data by using a Mie-theory-based retrieval algorithm. The determined values could be used for comparisons with calculated wavelength-dependent κ values typically deduced from bulkphase measurements by using indirect measurement methods. Accordingly, the presented comparison of the measured and calculated aerosol optical absorption spectra revealed the strong need for standardized sample preparation and measurement methodology in case of bulk-phase measurements.

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Wavelength dependent mass-specific optical absorption coefficients of laser generated coal aerosols determined from multi-wavelength photoacoustic measurements

Cited by 24 publications

References 33 publications

Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Seasonal Characteristics of Aerosol Black Carbon in Relation to Long Range Transport over Tripura in Northeast India

Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

Mass-specific optical absorption coefficients and imaginary part of the complex refractive indices of mineral dust components measured by a multi-wavelength photoacoustic spectrometer

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