Possible role of NO<sub>3</sub> in the nighttime chemistry of a cloud

Chameides, William L.

doi:10.1029/jd091id05p05331

Cited by 58 publications

(24 citation statements)

References 31 publications

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“…However, we observe higher efficiency for the catalytic cycle involving sulfur, probably because of a more complete network of reactions involved in this cycle. We also observe that at high NOx levels (as was treated by Chameides [1986a]) the uptake of NO3 is less efficient due to the recombination with NO2. As a result, its relative contribution to aqueous phase production of NO3' is lower.…”

Section: Discussionmentioning

confidence: 76%

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Multiphase chemistry of NO₃ in the remote troposphere

Rudich¹,

Talukdar²,

Ravishankara³

1998

J. Geophys. Res.

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Abstract. The effect of NO 3 uptake at night into marine aerosol and cloud droplets on (1) sulfur oxidation, (2) NO 3 ambient concentrations, and (3) NO 3 atmospheric lifetime is examined using a simple chemical kinetics model. It is shown that the atmospheric lifetime toward multiphase removal of NO 3 is < 10 min in presence of cloud droplets. We also show that at low mixing ratios of H202 (<150 pmol/mol), NO 3 can enhance sulfur oxidation in clouds via a catalytic cycle with a chain length of~8. Finally, in presence of sea-salt aerosol, the uptake of NO 3 leads to low ambient concentrations of NO3, efficient S(IV) oxidation, and possibly, to release of halogens from the aerosol. The results of this study imply that the multiphase reaction of NO 3 may be important in the remote marine boundary layer.

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Section: Discussionmentioning

confidence: 76%

“…The conclusions of this study should be compared to those obtained by Chameides [1986a], although we have restricted our simulation to a lower range of NOx. The current study contains a more detailed liquid phase reaction scheme, and it includes the reactive uptake of NO3 due to reaction with water.…”

Section: Discussionmentioning

confidence: 99%

Multiphase chemistry of NO₃ in the remote troposphere

Rudich¹,

Talukdar²,

Ravishankara³

1998

J. Geophys. Res.

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“…It was suggested by Platt et al (1981) and Heikes and Thompson (1983) that NO 3 and N20 s can be scavenged by wetted aerosols and hydrometeors. The uptake of NO 3 is potentially important, not only from the point of view that it reduces NO x concentrations, but also because NO 3 is a reactive radical that initiates further reaction sequences (Chameides, 1986b), an aspect that we look into in some more detail.…”

Section: Nighttime Chemisto Of Nitrogen Oxidesmentioning

confidence: 99%

The role of clouds in tropospheric photochemistry

1991

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We show that photochemical processes in the lower half of the troposphere are strongly affected by the presence of liquid water clouds. Especially CH20, an important intermediate of CH~ (and of other hydrocarbon) oxidation, is subject to enhanced breakdown in the aqueous phase. This reduces the formation of HOx-radicals via photodissociation of CH20 in the gas phase. In the droplets, the hydrated form of CH20, its oxidation product HCOg, and H202 recycle 02 radicals which, in turn, react with ozone. We show that the latter reaction is a significant sink for O~. Further O3 concentrations are reduced as a result of decreased formation of 03 during periods with clouds, Additionally, NO X, which acts as a catalyst in the photochemical formation of 03, is depleted by clouds during the night via scavenging of NzO 5. This significantly reduces NOx-concentrations during subsequent daylight hours, so that less NO, is available for O3 production. Clouds thus directly reduce the concentrations of O3, CH,O, NOx, and HO~. Indirectl}, this also affects the budgets of other trace gases, such as H202, CO, and H2.

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“…The intermittent detectability of NO 3 radicals is likely to be related to the complex and varying nature of the homogeneous (Platt et al, , 1981 and heterogeneous processes for removal of NO 3 radicals from the atmosphere. Heterogeneous processes are likely to include removal of NO 3 radicals by hygroscopic aerosols (Platt et al, 1981(Platt et al, , 1984, fog (Plattet al, 1981), and clouds (Chameides, 1986).…”

Section: Reaction Of No 3 Radicals With Alkenesmentioning

confidence: 99%

Estimating product yields of carbon-containing products from the atmospheric photooxidation of ambient air alkenes

Altshuller

1991

J Atmos Chem

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The yields of products have been calculated for the reactions of hydroxyl radicals and ozone with 19 of the two-through-six carbon anthropogenic alkenes. Based on their rate of reaction, mechanisms of reactions and the ambient air distribution for these alkenes their seasonal ambient air yields have been estimated.Aldehydes predominate as products irrespective of season, with smaller yields of several ketones. Other minor products include carboxylic acids, carbon monoxide, carbon dioxide, and alkenes. About a two-fold increase is estimated in the yields of 'hot' biradicals and their products from summer to winter.One sensitivity analysis was made by recomputing yields at a different OH radical to 03 concentration than assumed most likely in the calculations discussed above. In addition, the sensitivity of product yields to an estimated range of seasonally averaged sunset-to-sunrise NO 3 radical concentrations was calculated. The effects of free radical reactions are discussed, but these are believed to make a relatively minor contribution within the NO/-rich atmospheres that contain anthropogenic alkenes.The uncertainties in product yields associated with the range of NO 3 radical concentrations assumed present is relatively small for aldehydes, as is the decrease in yield of the one carbon 'hot' biradical. Larger uncertainties occur for ketones. Significant decreases in yields occur for larger 'hot' biradicals, especially the branched-chain 'hot' radicals in the presence of NO 3 radicals.

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Possible role of NO₃ in the nighttime chemistry of a cloud

Abstract: Recently, Charneides [1986] presented the results of calcula-

Cited by 58 publications

References 31 publications

Multiphase chemistry of NO₃ in the remote troposphere

Multiphase chemistry of NO₃ in the remote troposphere

The role of clouds in tropospheric photochemistry

Estimating product yields of carbon-containing products from the atmospheric photooxidation of ambient air alkenes

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Possible role of NO3 in the nighttime chemistry of a cloud

Abstract: Recently, Charneides [1986] presented the results of calcula-

Cited by 58 publications

References 31 publications

Multiphase chemistry of NO3 in the remote troposphere

Multiphase chemistry of NO3 in the remote troposphere

The role of clouds in tropospheric photochemistry

Estimating product yields of carbon-containing products from the atmospheric photooxidation of ambient air alkenes

Contact Info

Product

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Possible role of NO₃ in the nighttime chemistry of a cloud

Multiphase chemistry of NO₃ in the remote troposphere

Multiphase chemistry of NO₃ in the remote troposphere