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

Giordano, Michael R.; Espinoza, Carlos; Asa-Awuku, Akua

doi:10.5194/acp-15-1807-2015

Cited by 29 publications

(25 citation statements)

References 59 publications

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“…The covering filled the void spaces in the agglomerate, which resulted in a higher effective density. The results are consistent with previous work on the photochemical exposure of both biomass burning aerosol and diesel exhaust (Nakao et al 2011, Giordano et al 2015 that showed particles become denser with photochemical aging. Like the volatility results, the rate of change of the bulk effective densities between the two fuels are similar for the first two hours of photochemical aging.…”

Section: Resultssupporting

confidence: 92%

“…Here, the fractal-like dimension is a measure of the deviation from sphericity of the particle where D f ′<3 indicates a non-spherical particle. Additional information on the fractal nature of biomass burning particles is reported in Giordano et al (2015).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…flaming, smoldering, or mixed phase) affect the emissions properties of biomass burning (Ward 2003, Petters et al 2009, Thonicke et al 2010. Additionally, photochemical aging of biomass burning emissions can effect aerosol properties such as hygroscopicity, light absorption, surface activity, and morphology (Hennigan et al 2011, Engelhart et al 2012, Giordano et al 2013, Zhong and Jang 2014, Giordano et al 2015.…”

Section: Introductionmentioning

confidence: 99%

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Does chronic nitrogen deposition during biomass growth affect atmospheric emissions from biomass burning?

Giordano¹,

Chong

Weise

et al. 2016

Environ. Res. Lett.

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Chronic nitrogen deposition has measureable impacts on soil and plant health. We investigate burning emissions from biomass grown in areas of high and low NO x deposition. Gas and aerosolphase emissions were measured as a function of photochemical aging in an environmental chamber at UC-Riverside. Though aerosol chemical speciation was not available, results indicate a systemic compositional difference between biomass grown in high and low deposition areas. Aerosol emissions from biomass grown in areas of high NO x deposition exhibit a lower volatility than biomass grown in a low deposition area. Furthermore, fuel elemental analysis, NO x emission rates, and aerosol particle number distributions differed significantly between the two sites. Despite the limited scale of fuels explored, there is strong evidence that the atmospheric emissions community must pay attention to the regional air quality of biomass fuels growth areas.

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Section: Resultssupporting

confidence: 92%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Does chronic nitrogen deposition during biomass growth affect atmospheric emissions from biomass burning?

Giordano¹,

Chong

Weise

et al. 2016

Environ. Res. Lett.

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“…It is noted that the vehicle exhaust emissions may be fractal, which can affect the electrical mobility diameter measurements and subsequent CCN activation. 27,28 However, for the analysis of these emissions, the particles are assumed to be spherical. It is assumed that emissions during nonregeneration are likely organic and fractal and will lower κ measured values.…”

Section: Experimental Methodsmentioning

confidence: 99%

Will Aerosol Hygroscopicity Change with Biodiesel, Renewable Diesel Fuels and Emission Control Technologies?

Short

Karavalakis

et al. 2017

Environ. Sci. Technol.

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The use of biodiesel and renewable diesel fuels in compression ignition engines and aftertreatment technologies may affect vehicle exhaust emissions. In this study two 2012 light-duty vehicles equipped with direct injection diesel engines, diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) were tested on a chassis dynamometer. One vehicle was tested over the Federal Test Procedure (FTP) cycle on seven biodiesel and renewable diesel fuel blends. Both vehicles were exercised over double Environmental Protection Agency (EPA) Highway fuel economy test (HWFET) cycles on ultralow sulfur diesel (ULSD) and a soy-based biodiesel blend to investigate the aerosol hygroscopicity during the regeneration of the DPF. Overall, the apparent hygroscopicity of emissions during nonregeneration events is consistently low (κ < 0.1) for all fuels over the FTP cycle. Aerosol emitted during filter regeneration is significantly more CCN active and hygroscopic; average κ values range from 0.242 to 0.439 and are as high as 0.843. Regardless of fuel, the current classification of "fresh" tailpipe emissions as nonhygroscopic remains true during nonregeneration operation. However, aftertreatment technologies such as DPF, will produce significantly more hygroscopic particles during regeneration. To our knowledge, this is the first study to show a significant enhancement of hygroscopic materials emitted during DPF regeneration of on-road diesel vehicles. As such, the contribution of regeneration emissions from a growing fleet of diesel vehicles will be important.

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“…We stress that the call for consistency between measurement and RTM calculations is by no means a call for abandoning the investigation of the morphology of carbonaceous particles. This study focuses on the climate effect of OA light absorption, and the conclusions do not necessarily apply to other climate‐relevant properties (e.g., cloud condensation nuclei activation) [ Giordano et al ., ]. Furthermore, understanding the evolution of morphology upon atmospheric aging is of major importance.…”

Section: Discussionmentioning

confidence: 99%

The interplay between assumed morphology and the direct radiative effect of light‐absorbing organic aerosol

Saleh

Adams

Donahue

et al. 2016

Geophysical Research Letters

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Mie theory is widely employed in aerosol top‐of‐the‐atmosphere direct radiative effect (DRE) calculations and to retrieve the absorptivity of light‐absorbing organic aerosol (OA) from measurements. However, when OA is internally mixed with black carbon, it may exhibit complex morphologies whose optical behavior is imperfectly predicted by Mie theory, introducing bias in the retrieved absorptivities. We performed numerical experiments and global radiative transfer modeling (RTM) to investigate the effect of this bias on the calculated absorption and thus the DRE. We show that using true OA absorptivity, retrieved with a realistic representation of the complex morphology, leads to significant errors in DRE when the RTM employs the simplified Mie theory. On the other hand, when Mie theory is consistently applied in both OA absorptivity retrieval and the RTM, the errors largely cancel out, yielding accurate DRE. As long as global RTMs use Mie theory, they should implement parametrizations of light‐absorbing OA derived from retrievals based on Mie theory.

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

Cited by 29 publications

References 59 publications

Does chronic nitrogen deposition during biomass growth affect atmospheric emissions from biomass burning?

Does chronic nitrogen deposition during biomass growth affect atmospheric emissions from biomass burning?

Will Aerosol Hygroscopicity Change with Biodiesel, Renewable Diesel Fuels and Emission Control Technologies?

The interplay between assumed morphology and the direct radiative effect of light‐absorbing organic aerosol

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