Contribution of methane to aerosol carbon mass

Bianchi, Federico; Barmet, Peter; Stirnweis, Lisa; Haddad, Imad El; Platt, Stephen Matthew; Saurer, Matthias; Lötscher, C.; Siegwolf, Rolf; Bigi, Alessandro; Hoyle, C. R.; DeCarlo, P. F.; Slowik, Jay G.; Prévôt, Andrê S. H.; Baltensperger, Urs; Dommen, Josef

doi:10.1016/j.atmosenv.2016.06.036

Cited by 12 publications

(12 citation statements)

References 28 publications

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“…Therefore, NO 2 is used as a surrogate for the NO levels influencing OA and HCHO production. The yields of HCHO and SOA also depend on VOC speciation (e.g., Lee et al, 2006;Bianchi et al, 2016). Specifically, isoprene has a higher yield of HCHO than most non-alkene VOCs (Dufour et al, 2009).…”

Section: Dependence On No X and Voc Speciationmentioning

confidence: 99%

Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance

et al. 2019

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Abstract. Organic aerosol (OA) is one of the main components of the global particulate burden and intimately links natural and anthropogenic emissions with air quality and climate. It is challenging to accurately represent OA in global models. Direct quantification of global OA abundance is not possible with current remote sensing technology; however, it may be possible to exploit correlations of OA with remotely observable quantities to infer OA spatiotemporal distributions. In particular, formaldehyde (HCHO) and OA share common sources via both primary emissions and secondary production from oxidation of volatile organic compounds (VOCs). Here, we examine OA–HCHO correlations using data from summertime airborne campaigns investigating biogenic (NASA SEAC4RS and DC3), biomass burning (NASA SEAC4RS), and anthropogenic conditions (NOAA CalNex and NASA KORUS-AQ). In situ OA correlates well with HCHO (r=0.59–0.97), and the slope and intercept of this relationship depend on the chemical regime. For biogenic and anthropogenic regions, the OA–HCHO slopes are higher in low NOx conditions, because HCHO yields are lower and aerosol yields are likely higher. The OA–HCHO slope of wildfires is over 9 times higher than that for biogenic and anthropogenic sources. The OA–HCHO slope is higher for highly polluted anthropogenic sources (e.g., KORUS-AQ) than less polluted (e.g., CalNex) anthropogenic sources. Near-surface OAs over the continental US are estimated by combining the observed in situ relationships with HCHO column retrievals from NASA's Ozone Monitoring Instrument (OMI). HCHO vertical profiles used in OA estimates are from climatology a priori profiles in the OMI HCHO retrieval or output of specific period from a newer version of GEOS-Chem. Our OA estimates compare well with US EPA IMPROVE data obtained over summer months (e.g., slope =0.60–0.62, r=0.56 for August 2013), with correlation performance comparable to intensively validated GEOS-Chem (e.g., slope =0.57, r=0.56) with IMPROVE OA and superior to the satellite-derived total aerosol extinction (r=0.41) with IMPROVE OA. This indicates that OA estimates are not very sensitive to these HCHO vertical profiles and that a priori profiles from OMI HCHO retrieval have a similar performance to that of the newer model version in estimating OA. Improving the detection limit of satellite HCHO and expanding in situ airborne HCHO and OA coverage in future missions will improve the quality and spatiotemporal coverage of our OA estimates, potentially enabling constraints on global OA distribution.

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Section: Dependence On No X and Voc Speciationmentioning

confidence: 99%

Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance

et al. 2019

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“…POA is directly emitted into the atmosphere, largely from combustion process, and SOA is formed in the atmosphere by oxidation of volatile gas-phase organic compounds emitted into the atmosphere either by biogenic or anthropogenic activity. The gas-phase compounds can be either abundant volatile organic compounds (VOC, for example, even methane, in certain conditions, is able to form SOA 2 ) or less abundant but more potent intermediate volatile organic compounds (IVOC). 3 It has been estimated that SOA is the biggest fraction of the total organic aerosol.…”

Section: Introductionmentioning

confidence: 99%

Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol

et al. 2019

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Highly oxygenated organic molecules (HOM) are formed in the atmosphere via autoxidation involving peroxy radicals arising from volatile organic compounds (VOC). HOM condense on pre-existing particles and can be involved in new particle formation. HOM thus contribute to the formation of secondary organic aerosol (SOA), a significant and ubiquitous component of atmospheric aerosol known to affect the Earth’s radiation balance. HOM were discovered only very recently, but the interest in these compounds has grown rapidly. In this Review, we define HOM and describe the currently available techniques for their identification/quantification, followed by a summary of the current knowledge on their formation mechanisms and physicochemical properties. A main aim is to provide a common frame for the currently quite fragmented literature on HOM studies. Finally, we highlight the existing gaps in our understanding and suggest directions for future HOM research.

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“…Additionally, incomplete WB leads to methane (CH 4 ) emissions [18][19][20] , which contribute relatively less to SOA formation owing to low SOA yields. 21 However, methane emissions impact the environment by their high global warming potential.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Secondary Organic Aerosol Formation from Log Wood Burning Emissions by Catalytic Removal of Aromatic Hydrocarbons

Pieber

Kambolis

Ferri

et al. 2018

Environ. Sci. Technol.

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Log wood burning is a significant source of volatile organic compounds including aromatic hydrocarbons (ArHC). ArHC are harmful, reactive in the ambient atmosphere, and important secondary organic aerosol (SOA) precursors. Consequently, SOA is a major fraction of the total organic aerosol emitted by log wood burning. ArHC reduction is thus critical in the mitigation of adverse health and environmental impacts of log wood burning. In this study, two Pt-based catalytic converters were prepared and tested for the mitigation of real-world log wood burning emissions, including ArHC and SOA (studied using a potential aerosol mass oxidation flow reactor), as well as toxic carbon monoxide (CO) and methane, a greenhouse gas. Substantial removal of mono-and polycyclic ArHC and in particular phenolic compounds was achieved with both catalysts operated at realistic chimney temperatures (50% conversion was achieved at 200 and 300°C for non-methane hydrocarbons in our experiments for Pt/Al 2 O 3 and Pt/CeO 2 -Al 2 O 3 respectively). The catalytically cleaned emissions exhibited a substantially reduced SOA formation already at temperatures as low as 185 to 310°C, which substantially lowers the total PM burden of log wood burning. Thus, catalytic converters can effectively reduce primary and secondary log wood burning pollutants and thereby, their adverse health and environmental effects.

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Contribution of methane to aerosol carbon mass

Cited by 12 publications

References 28 publications

Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance

Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance

Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol

Mitigation of Secondary Organic Aerosol Formation from Log Wood Burning Emissions by Catalytic Removal of Aromatic Hydrocarbons

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