Ammonium nitrate in airborne particles in Los Angeles

Gordon, Robert J.; Bryan, R.J.

doi:10.1021/es60079a002

Cited by 39 publications

(18 citation statements)

References 6 publications

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“…D 'Ans, 1913), and observations of ammonium, sulphate, and nitrate in PM have appeared in the literature over the past sixty years (cf. Robbins and Cadle, 1958;Fenn et al, 1963;Spurny and Heard, 1969;Heard and Wiffen, 1969;Gordon and Bryan, 1973;Anlauf et al, 1978;Brosset, 1978;Stelson et al, 1979;Tanner, 1983). The partitioning between different phases, including gases, may be predicted using fundamental thermodynamics theory (cf.…”

Section: Introductionmentioning

confidence: 99%

Modelling the impacts of ammonia emissions reductions on North American air quality

et al. 2009

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Abstract.A unified regional air-quality modelling system (AURAMS) was used to investigate the effects of reductions in ammonia emissions on regional air quality, with a focus on particulate-matter formation. Three simulations of one-year duration were performed for a North American domain: (1) a base-case simulation using 2002 Canadian and US national emissions inventories augmented by a more detailed Canadian emissions inventory for agricultural ammonia; (2) a 30% North-American-wide reduction in agricultural ammonia emissions; and (3) a 50% reduction in Canadian beef-cattle ammonia emissions. The simulations show that a 30% continent-wide reduction in agricultural ammonia emissions lead to reductions in median hourly PM 2.5 mass of <1 µg m −3 on an annual basis. The atmospheric response to these emission reductions displays marked seasonal variations, and on even shorter time scales, the impacts of the emissions reductions are highly episodic: 95th-percentile hourly PM 2.5 mass decreases can be up to a factor of six larger than the median values.A key finding of the modelling work is the linkage between gas and aqueous chemistry and transport; reductions in ammonia emissions affect gaseous ammonia concentrations close to the emissions site, but substantial impacts on particulate matter and atmospheric deposition often occur at considerable distances downwind, with particle nitrate being the main vector of ammonia/um transport. Ammonia emissions reductions therefore have trans-boundary consequences downwind. Calculations of critical-load exceedances for sensitive ecosystems in Canada suggest that ammonia emission reductions will have a minimal impact on Correspondence to: P. A. Makar (paul.makar@ec.gc.ca) current ecosystem acidification within Canada, but may have a substantial impact on future ecosystem acidification. The 50% Canadian beef-cattle ammonia emissions reduction scenario was used to examine model sensitivity to uncertainties in the new Canadian agricultural ammonia emissions inventory, and the simulation results suggest that further work is needed to improve the emissions inventory for this particular sector. It should be noted that the model in its current form neglects coarse mode base cation chemistry, so the predicted effects of ammonia emissions reductions shown here should be considered upper limits.

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Section: Introductionmentioning

confidence: 99%

Modelling the impacts of ammonia emissions reductions on North American air quality

et al. 2009

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“…Results show that, Raman Spectra and SEM-EDX structural analysis of the samples can be used very efficiently to identify the pollutants on the ancient walls of historical monuments and thus, some precautions can be taken for restoring such architectures [4,5]. Codes were given to the samples as VA1, VA2.…”

Section: Raman Spectramentioning

confidence: 99%

“…On the other hand, many classes of inorganic and organic compounds and materials can be expected to be major constituents of airborne particulate matter. Different workers have concluded that the principal sulfur and nitrogen species are SO 4 À2 , NO À3 and NH +4 , which are ''urban aerosols'', and suggested that the most likely combinations of these ions are ammonium nitrate [4] and ammonium sulfate [5]. A recent study was done by Raman spectroscopy assisted with XRF and chemical simulation to assess the synergic impacts of guardrails and traffic pollutants on urban soils [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of hazardous pollutants on the walls of Valence Aqueduct (Istanbul) by Raman spectroscopy, SEM–EDX and Geographical Information System

Ünsalan

Kuzucuoğlu

2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Uma parte substancial dos ácidos atmosféricos gerados pela oxidação do SO 2 e NO x é neutralizada pela amônia e os produtos finais são os sais de amônio, na forma de material particulado [36][37][38] . Reações de neutralização parecem ser, juntamente com as deposições seca e úmida, os meios de remoção mais comuns dos compostos ácidos na atmosfera.…”

Section: Importância Ambiental Da Amônia Atmosféricaunclassified

Amônia (NH3) atmosférica: fontes, transformação, sorvedouros e métodos de análise

Felix

Cardoso

2004

Quím. Nova

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Ammonium nitrate in airborne particles in Los Angeles

Cited by 39 publications

References 6 publications

Modelling the impacts of ammonia emissions reductions on North American air quality

Modelling the impacts of ammonia emissions reductions on North American air quality

Effects of hazardous pollutants on the walls of Valence Aqueduct (Istanbul) by Raman spectroscopy, SEM–EDX and Geographical Information System

Amônia (NH3) atmosférica: fontes, transformação, sorvedouros e métodos de análise

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