Observation on great dun fell of the pathways by which oxides of nitrogen are converted to nitrate

Colvile, R. N.; Choularton, T. W.; Gallagher, Martin; Wicks, A. J.; Downer, R. M.; Tyler, Bonnie J.; Storetonwest, K. J.; Fowler, D.; Cape, J. N.; Dollard, G. J.; Davies, Trevor J.; Jones, Brian M.; Penkett, S. A.; Bandy, B. J.; Burgess, Rachel

doi:10.1016/1352-2310(94)90119-8

Cited by 17 publications

(2 citation statements)

References 26 publications

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“…Leaitch et al (1988) studied the dissolution of N 2 O 5 in cloud droplets by using a Lagrangian chemical model with winter conditions in northeastern region of the United States and compared the resulting NO 3 − content in cloud water with measured values. They showed that the mean production rate of HNO 3 via cloud scavenging is also much more efficient than homogeneous N 2 O 5 hydrolysis, which was observed by Colvile et al (1994) as well. The potential significance of N 2 O 5 uptake on fog droplets was demonstrated through measurements by Wood et al (2005), where the N 2 O 5 mixing ratio was well below the detection limit of the instrument (LIF) during nights of high RH (above 70%).…”

Section: Model Representation Of N 2 O 5 Uptakementioning

confidence: 76%

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review

Chang

Bhave

Brown

et al. 2011

Aerosol Science and Technology

251

298

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Section: Model Representation Of N 2 O 5 Uptakementioning

confidence: 76%

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review

Chang

Bhave

Brown

et al. 2011

Aerosol Science and Technology

251

298

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“…The principal heterogenous NO x removal mechanism is via the hydrolysis of N 2 O 5 which is much slower in the gas phase. Field observations and laboratory studies support the efficient uptake of N 2 O 5 [17,18], with said studies measuring the reaction probability (γ) to be in the range of 0.01-1 for aqueous solutions such as H 2 SO 4 largely independent of aerosol composition [19]. Importantly, the timescale for N 2 O 5 removal on tropospheric aerosol is estimated to range from minutes in heavily polluted air, characterised by increased particle density and surface area, to hours in more remote regions [16].…”

Section: Introductionmentioning

confidence: 80%

Investigating the Effect of Fine Particulate Matter (PM2.5) Emission Reduction on Surface-Level Ozone (O3) during Summer across the UK

Curley,

Holland,

Khan

et al. 2024

Atmosphere

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UK air pollutant data collected over a 10-year period (2010–2019) from 46 sites with Urban Traffic, Urban Background, Suburban Background, Rural Background, and Urban Industrial environmental types were analysed to study the relationships between [NO] vs. [PM2.5] and [O3] vs. [PM2.5] during the summer for each site type. These results were used to describe the consequence of recent PM2.5 reductions on NO and O3 concentrations at different site types across the UK. The strongest positive [NO] vs. [PM2.5] correlation was observed for the Urban Traffic site type overall, but it displayed the weakest positive [O3] vs. [PM2.5] correlation. Analysis of individual Urban Traffic sites revealed an overall negative [O3] vs. [PM2.5] gradient at the London Marylebone Road (LMR) site. A sharp 35% PM2.5 decrease occurred at LMR between 2011 and 2015 before annual mean concentrations plateaued. Further examination of annual correlations revealed negative [O3] vs. [PM2.5] gradients in each year directly proceeding the sharp 35% PM2.5 decrease at LMR. NOx fluctuations were minimal and accompanied by comparable volatile organic compound (VOC) decreases; thus, VOC-limited chemistry at LMR was deemed to not be the primary cause of O3 increases. Instead, PM2.5 reductions are suggested to be a more significant factor in causing O3 increases, as suppression of O3 production by PM2.5 chemistry decreases with declining [PM2.5]. The remaining two Urban Traffic sites in Birmingham did not display a negative [O3] vs. [PM2.5] correlation in the years studied. This was partly ascribed to the Birmingham measurement sites not being under the influence of the street canyon effect like LMR. Principal attribution was to the lower-average absolute initial PM2.5 concentrations and absence of a significant (>26%) continuous mean PM2.5 decline of greater than 2 years. This study therefore proposed a threshold initial PM2.5 concentration (t) above which O3 suppression by PM2.5 chemistry is sufficient to induce O3 increases when average PM2.5 concentrations significantly decline (by >26% across >2 years), where 17 μg m−3 < t < 26 μg m−3. Extending this analysis to additional cities across the UK as sufficient data become available would allow refinement of the proposed threshold and improved understanding of the influence from the street canyon effect. These results inform future air pollution policies, in the UK and across the globe, in which further joint reductions of PM2.5 and O3 are crucial to achieve maximum benefits to human health.

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Individual Results from GCE Principal Investigators

Arends

Kos

Möls

et al. 1997

Cloud Multi-Phase Processes and High Alpine Air and Snow Chemistry

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Observation on great dun fell of the pathways by which oxides of nitrogen are converted to nitrate

Cited by 17 publications

References 26 publications

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review

Investigating the Effect of Fine Particulate Matter (PM2.5) Emission Reduction on Surface-Level Ozone (O3) during Summer across the UK

Individual Results from GCE Principal Investigators

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Observation on great dun fell of the pathways by which oxides of nitrogen are converted to nitrate

Cited by 17 publications

References 26 publications

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N2O5: A Review

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N2O5: A Review

Investigating the Effect of Fine Particulate Matter (PM2.5) Emission Reduction on Surface-Level Ozone (O3) during Summer across the UK

Individual Results from GCE Principal Investigators

Contact Info

Product

Resources

About

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review

Heterogeneous Atmospheric Chemistry, Ambient Measurements, and Model Calculations of N₂O₅: A Review