Investigation of the gas phase reaction of dinitrogen pentoxide with water vapor

Sverdrup, G.M.; Spicer, Chester W.; Ward, Gerald F.

doi:10.1002/kin.550190304

Cited by 37 publications

(12 citation statements)

References 11 publications

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“…Note also that Sander et al (2003;JPL recommendations) give a slightly higher upper limit of 2×10 −21 for the first order Reaction (5a). They also point out the large difficulty in distinguishing between the gas phase and the heterogeneous reactions of N 2 O 5 with water and mention that the rate of (5a) could be 4 times lower, as has been measured by Sverdrup et al (1987). This fourfold uncertainty is taken into account in the following discussion.…”

Section: Introductionmentioning

confidence: 87%

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

et al. 2004

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Abstract. During the MINOS campaign (28 July-18 August 2001) the nitrate (NO 3 ) radical was measured at Finokalia station, on the north coast of Crete in South-East Europe using a long path (10.4 km) Differential Optical Absorption Spectroscopy instrument (DOAS). Hydroxyl (OH) radical was also measured by a Chemical Ionization MassSpectrometer . These datasets represent the first simultaneous measurements of OH and NO 3 radicals in the area. NO 3 radical concentrations ranged from less than 3×10 7 up to 9×10 8 radicals . cm −3 with an average nighttime value of 1.1×10 8 radicals . cm −3 .The observed NO 3 mixing ratios are analyzed on the basis of the corresponding meteorological data and the volatile organic compound (VOC) observations which were measured simultaneously at Finokalia station. The importance of the NO 3 radical chemistry relatively to that of OH in the dimethylsulfide (DMS) and nitrate cycles is also investigated. The observed NO 3 levels regulate the nighttime variation of DMS. The loss of DMS by NO 3 during night is about 75% of that by OH radical during day. NO 3 and nitrogen pentoxide (N 2 O 5 ) reactions account for about 21% of the total nitrate (HNO 3(g) +NO − 3(g) ) production.

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Section: Introductionmentioning

confidence: 87%

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

et al. 2004

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“…It is known that, at night, 0 3 oxidizes NO to NO 2 and, if sufficient 0 3 is present, the oxidation proceeds to NO 3. The most recent determination has found an upper limit of 2.7 X 10 -22 ½m 3 molecule -• s -• [Sverdrup et al, 1987]. Observed nighttime concentrations of NO 3 imply that there must be some unidentified sink for NO 3 or N205.…”

Section: Introductionmentioning

confidence: 98%

Reaction probability of N₂O₅ on aqueous aerosols

Mozurkewich¹,

Calvert²

1988

J. Geophys. Res.

295

257

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The reaction probability, γ, of N2O5 (to form HNO3) with monodisperse NH3/H2SO4/H2O aerosols has been measured in a flow tube reactor at atmospheric pressure. Experiments were performed at temperatures of 274 and 293 K and at relative humidities of 1–76%. It appears that the presence of a liquid phase is necessary for reaction. With NH4HSO4 aerosol, γ values are nonzero, even below the deliquescence point of the pure salt, and show a gradual increase with increasing relative humidity up to constant values of 0.05 and 0.09 for 293 and 274 K, respectively. Experiments with aerosols of varied NH3/H2SO4 ratios suggest that evaporation of NH3 from the NH4HSO4 aerosols creates excess H2SO4 on the surface. This can take up water vapor to provide the reactant for N2O5 below the deliquescence point of NH4HSO4. The present observations are consistent with the reaction of N2O5 with moist aerosols being a major removal mechanism for odd nitrogen and a major source of HNO3 in the nighttime troposphere. The same reaction on H2SO4 aerosols may be of significance in the stratosphere.

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“…The rate constant was revised by A. J. Hamlin and R. E. Honrath (manuscript in preparation, 2002) to use the gas‐phase rate constant recommended by DeMore et al [1997] ( k < 2.0 × 10 −21 cm 3 molecules −1 s −1 ). Due to the difficulty in separating the homogeneous and heterogeneous processes of this reaction, this rate constant is an overestimate of the gas‐phase‐only rate constant and is equal to 4 times the upper limit gas phase rate constant determined by Sverdrup et al [1987]. As a result, while N 2 O 5 hydrolysis is modeled as a gas phase process, the rate is consistent with that expected for the combination of homogeneous and heterogeneous reactions.…”

Section: Resultsmentioning

confidence: 56%

A modeling study of the impact of winter–spring arctic outflow on the NO_x and O₃ budgets of the North Atlantic troposphere

Hamlin

Honrath

2002

J. Geophys. Res.

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[1] In this study, we determine the impact of winter-spring arctic outflow events on the budgets of tropospheric NO x and ozone over the North Atlantic Ocean. An updated version of the NCAR Master-Mechanism, a detailed, explicit photochemical model, is applied to trajectories representative of arctic outflow for the months of January through May. During the simulations, peroxyacetyl nitrate (PAN) mixing ratios drop by up to 270 pptv, increasing NO x levels up to 120 pptv. However, the released NO x is quickly destroyed by efficient NO x loss reactions leading to formation of HNO 3 and, to a lesser extent, nitroaromatic compounds. As a result of elevated NO x , O 3 levels are increased. The resulting net impact on the flux of O 3 to the North Atlantic is estimated to be less than 712 Gg O 3 /month. While this source is similar in magnitude to estimates of ozone produced from aircraft emissions, both are small in comparison to the export of ozone from North America. Therefore, we conclude that while elevated levels of pollutants in arctic outflow increase the levels of NO x and O 3 in the North Atlantic region, on a seasonal basis the impact on the budgets of NO x and O 3 in this region is small.

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Investigation of the gas phase reaction of dinitrogen pentoxide with water vapor

Cited by 37 publications

References 11 publications

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Reaction probability of N₂O₅ on aqueous aerosols

A modeling study of the impact of winter–spring arctic outflow on the NO_x and O₃ budgets of the North Atlantic troposphere

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Investigation of the gas phase reaction of dinitrogen pentoxide with water vapor

Cited by 37 publications

References 11 publications

Role of the NO&lt;sub&gt;3&lt;/sub&gt; radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Role of the NO&lt;sub&gt;3&lt;/sub&gt; radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Reaction probability of N2O5 on aqueous aerosols

A modeling study of the impact of winter–spring arctic outflow on the NOx and O3 budgets of the North Atlantic troposphere

Contact Info

Product

Resources

About

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Role of the NO<sub>3</sub> radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign

Reaction probability of N₂O₅ on aqueous aerosols

A modeling study of the impact of winter–spring arctic outflow on the NO_x and O₃ budgets of the North Atlantic troposphere