Cloud condensation nuclei from biomass burning during the Amazonian dry-to-wet transition season

Martins, Jorge Alberto; Gonçalves, Fábio Luiz Teixeira; Morales, Carlos A.; Fisch, Gilberto; Pinheiro, Francisco Geraldo M; Júnior, João Bosco V. Leal; Oliveira, Carlos Jacinto de; Silva, Emerson M.; Oliveira, Juliana Ghisleni de; Costa, Alexandre Araújo; Dias, Maria A. F. Silva

doi:10.1007/s00703-009-0019-6

Cited by 30 publications

(21 citation statements)

References 39 publications

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“…Several recent works on biomass burning aerosol have focused on their ability to act as CCN (e.g., Novakov and Corrigan, 1996;Martins et al, 2009;Petters et al, 2009;Carrico et al, 2010;Rose et al, 2010Rose et al, , 2011Hennigan et al, 2011;Engelhart et al, 2012;Giordano et al, 2013;Lathem et al, 2013;Martin et al, 2013;Yokelson et al, 2009). The CCN ability of inorganic compounds can be described well by classical Köhler theory (Köhler, 1936).…”

Section: Biomass Burning Cloud Condensation Nucleimentioning

confidence: 99%

Experimentally measured morphology of biomass burning aerosol and its impacts on CCN ability

2015

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Abstract. This study examines the morphological properties of freshly emitted and atmospherically aged aerosols from biomass burning. The impacts of particle morphology assumptions on hygroscopic predictions are examined. Chamber experiments were conducted at the University of California, Riverside, Center for Environmental Research and Technology (CE-CERT) atmospheric processes lab using two biomass fuel sources: manzanita and chamise. Morphological data was obtained through the use of an aerosol particle mass analyzer (APM), scanning mobility particle sizer (SMPS) system and transmission electron microscope (TEM). Data from these instruments was used to calculate both a dynamic shape factor and a fractal-like dimension for the biomass burning emissions. This data was then used with κ-Köhler theory to adjust the calculated hygroscopicity for experimentally determined morphological characteristics of the aerosol. Laboratory measurement of biomass burning aerosol from two chaparral fuels show that particles are nonspherical with dynamic shape factors greater than 1.15 for aerosol sizes relevant to cloud condensation nuclei (CCN) activation. Accounting for particle morphology can shift the hygroscopicity parameter by 0.15 or more. To our knowledge, this work provides the first laboratory chamber measurements of morphological characteristics for biomass burning cloud condensation nuclei and provides experimental particle shape evidence to support the variation in reported hygroscopicities of the complex aerosol.

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Section: Biomass Burning Cloud Condensation Nucleimentioning

confidence: 99%

Experimentally measured morphology of biomass burning aerosol and its impacts on CCN ability

2015

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“…This equation contains only two parameters C and k. The parameter C represents the CCN number concentration at supersaturation of 1 %, which is higher in continental and polluted regions than oceanic and clean regions. The parameter k varies more significantly (Martins et al, 2009). Nevertheless, this equation does not fit CCN spectra well.…”

Section: Parameterization Of Ccn Spectra Using Aerosol Number Concentmentioning

confidence: 99%

An examination of parameterizations for the CCN number concentration based on in situ measurements of aerosol activation properties in the North China Plain

Deng

Zhao²,

Ma³

et al. 2013

Atmos. Chem. Phys.

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Precise quantification of the cloud condensation nuclei (CCN) number concentration is crucial for understanding aerosol indirect effects and characterizing these effects in models. An evaluation of various methods for CCN parameterization was carried out in this paper based on in situ measurements of aerosol activation properties within HaChi (Haze in China) project. Comparisons were made by closure studies between methods using CCN spectra, bulk activation ratios, cut-off diameters and size-resolved activation ratios. The estimation of CCN number concentrations by the method using aerosol size-resolved activation ratios, either averaged over a day or with diurnal variation, was found to be most satisfying and straightforward. This could be well expected since size-resolved activation ratios include information regarding the effects of size-resolved chemical compositions and mixing states on aerosol activation properties. The method using the averages of critical diameters, which were inferred from measured CCN number concentrations and particle number size distributions, also provided a good prediction of the CCN number concentration. Based on comparisons of all these methods in this paper, it was recommended that the CCN number concentration be predicted using particle number size distributions with inferred critical diameters or size-resolved activation ratios

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“…5a depicts the size-resolved hygroscopic growth factors (GFs) of smoke particles at 80% RH. Fresh smoke particles are hygroscopic, which enable them to be CCN (Martins et al, 2009;Engelhart et al, 2012). Size-and fuel type-dependence of GFs are also obvious, and size effect on GFs can be eliminated via equation (19):…”

Section: Hygroscopicitymentioning

confidence: 99%

Physiochemical properties of carbonaceous aerosol from agricultural residue burning: Density, volatility, and hygroscopicity

Li¹,

Hu²,

Chen³

et al. 2016

Atmospheric Environment

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Cloud condensation nuclei from biomass burning during the Amazonian dry-to-wet transition season

Cited by 30 publications

References 39 publications

Experimentally measured morphology of biomass burning aerosol and its impacts on CCN ability

Experimentally measured morphology of biomass burning aerosol and its impacts on CCN ability

An examination of parameterizations for the CCN number concentration based on in situ measurements of aerosol activation properties in the North China Plain

Physiochemical properties of carbonaceous aerosol from agricultural residue burning: Density, volatility, and hygroscopicity

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