Uptake of Hydrogen Halides by Water Droplets

Schweitzer, Francis; Mirabel, Philippe; George, Christian

doi:10.1021/jp992621o

Cited by 34 publications

(40 citation statements)

References 36 publications

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“…Although both Schweitzer et al (2000) and Li et al (2002) present bulk accommodation coefficients with a strong negative temperature dependence, there is disagreement of a factor of between 3 and 5 in the absolute values of α b . We have taken the data of Schweitzer et al (2000) as the basis of our recommended values owing in part to the larger number of data taken within a larger temperature range.…”

Section: Comments On Preferred Valuesmentioning

confidence: 98%

“…The preferred values are taken from Van Doren et al (1990), Schweitzer et al (2000) and Li et al (2002), despite the rather large uncertainty in the Van Doren et al (1990) study. This fact is due in part to the use of the droplet train apparatus in transverse geometry which affords a restricted range of gas-liquid contact times and therefore a low dynamic range of the measurements.…”

Section: Comments On Preferred Valuesmentioning

confidence: 99%

“…We have taken the data of Schweitzer et al (2000) as the basis of our recommended values owing in part to the larger number of data taken within a larger temperature range.…”

Section: Comments On Preferred Valuesmentioning

confidence: 99%

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Evaluated kinetic and photochemical data for atmospheric chemistry: Volume VI – heterogeneous reactions with liquid substrates

et al. 2013

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Abstract. This article, the sixth in the ACP journal series, presents data evaluated by the IUPAC Task Group on Atmospheric Chemical Kinetic Data Evaluation. It covers the heterogeneous processes involving liquid particles present in the atmosphere with an emphasis on those relevant for the upper troposphere/lower stratosphere and the marine boundary layer, for which uptake coefficients and adsorption parameters have been presented on the IUPAC website since 2009. The article consists of an introduction and guide to the evaluation, giving a unifying framework for parameterisation of atmospheric heterogeneous processes. We provide summary sheets containing the recommended uptake parameters for the evaluated processes. The experimental data on which the recommendations are based are provided in data sheets in separate appendices for the four surfaces considered: liquid water, deliquesced halide salts, other aqueous electrolytes and sulfuric acid.

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Section: Comments On Preferred Valuesmentioning

confidence: 98%

Section: Comments On Preferred Valuesmentioning

confidence: 99%

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Evaluated kinetic and photochemical data for atmospheric chemistry: Volume VI – heterogeneous reactions with liquid substrates

et al. 2013

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“…The predominant anion is chloride (with concentrations approaching 0.5-5.6 M); followed by bromide (∼10 mM) and iodide at least (∼1 µM) (von Glasow et al, 2003;Schweitzer et al, 2000). While halide anions are very stable, their corresponding oxidized forms (i.e., halogen atoms) are highly reactive and play an important role in the oxidation capacity of the MBL as discovered for the Arctic boundary layer (Barrie et al, 1988).…”

Section: Introductionmentioning

confidence: 97%

Photoinduced oxidation of sea salt halides by aromatic ketones: a source of halogenated radicals

et al. 2009

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Abstract.The interactions between triplet state benzophenone and halide anion species (Cl − , Br − and I − ) have been studied by laser flash photolysis (at 355 nm) in aqueous solutions at room temperature. The decay of the triplet state of benzophenone was followed at 525 nm. Triplet lifetime measurements gave rate constants, k q (M −1 s −1 ), close to diffusion controlled limit for iodide (∼8×10 9 M −1 s −1 ), somewhat less for bromide (∼3×10 8 M −1 s −1 ) and much lower for chloride (<10 6 M −1 s −1 ). The halide (X − ) quenches the triplet state; the resulting product has a transient absorption at 355 nm and a lifetime much longer than that of the benzophenone triplet state, is formed. This transient absorption feature matches those of the corresponding radical anion (X − 2 ). We therefore suggest that such reactive quenching is a photosensitized source of halogen in the atmosphere or the driving force for the chemical oxidation of the oceanic surface micro layer.

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“…b The Henry's Law constant is from Schweitzer et al (2000); The value in parentheses is the effective Henry's law constant K * H at pH 5 accounting for (Arnaud, 1966). c HOBr(aq)/BrO − acid dissociation is negligible under atmospheric conditions (K a = 1.6 × 10 −9 M, Haag and Hoigne, 1983).…”

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confidence: 99%

Tropospheric bromine chemistry: implications for present and pre-industrial ozone and mercury

et al. 2012

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Abstract. We present a new model for the global tropospheric chemistry of inorganic bromine (Br y ) coupled to oxidant-aerosol chemistry in the GEOS-Chem chemical transport model (CTM). Sources of tropospheric Br y include debromination of sea-salt aerosol, photolysis and oxidation of short-lived bromocarbons, and transport from the stratosphere. Comparison to a GOME-2 satellite climatology of tropospheric BrO columns shows that the model can reproduce the observed increase of BrO with latitude, the northern mid-latitudes maximum in winter, and the Arctic maximum in spring. This successful simulation is contingent on the HOBr + HBr reaction taking place in aqueous aerosols and ice clouds. Bromine chemistry in the model decreases tropospheric ozone mixing ratios by < 1-8 nmol mol −1 (6.5 % globally), with the largest effects in the northern extratropics in spring. The global mean tropospheric OH concentration decreases by 4 %. Inclusion of bromine chemistry improves the ability of global models (GEOS-Chem and p-TOMCAT) to simulate observed 19th-century ozone and its seasonality. Bromine effects on tropospheric ozone are comparable in the present-day and pre-industrial atmospheres so that estimates of anthropogenic radiative forcing are minimally affected. Br atom concentrations are 40 % higher in the pre-industrial atmosphere due to lower ozone, which would decrease by a factor of 2 the atmospheric lifetime of elemental mercury against oxidation by Br. This suggests that historical anthropogenic mercury emissions may have mostly deposited to northern mid-latitudes, enriching the corresponding surface reservoirs. The persistent rise in background surface ozone at northern mid-latitudes during the past decades could possibly contribute to the observations of elevated mercury in subsurface waters of the North Atlantic.

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Uptake of Hydrogen Halides by Water Droplets

Cited by 34 publications

References 36 publications

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume VI – heterogeneous reactions with liquid substrates

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume VI – heterogeneous reactions with liquid substrates

Photoinduced oxidation of sea salt halides by aromatic ketones: a source of halogenated radicals

Tropospheric bromine chemistry: implications for present and pre-industrial ozone and mercury

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