Kinetics of the tropospheric formaldehyde loss onto mineral dust and urban surfaces

Sassine, Maria; Burel, L.; D’Anna, Barbara; George, Christian

doi:10.1016/j.atmosenv.2009.07.044

Cited by 31 publications

(40 citation statements)

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“…Nevertheless, its uptake on TiO 2 and TiO 2 / SiO 2 mixture was largely enhanced by near-UV irradiation (340-420 nm) (Sassine et al, 2010). For pure TiO 2 under the condition of 293 K, 30 % RH, and 2 ppbv HCHO, γ ss depended linearly on irradiation intensity (1.9 × 10 15 to 2.7 × 10 15 photons cm −2 s −1 ).…”

Section: Kc-msmentioning

confidence: 95%

“…A coated wall flow tube was deployed to investigate heterogeneous reactions of HCHO with TiO 2 and SiO 2 particles, and the effects of UV irradiation, temperature (278-303 K), RH (6-70 %), and HCHO concentration (3.5-32.5 ppbv) were systematically examined (Sassine et al, 2010). Under dark conditions, the uptake of HCHO onto SiO 2 and TiO 2 was very slow, with BET-surface-area-based Xu et al (2010) 163-673 (1-20) × 10 13 At 295 ± 2 K, γ 0 (based on the BET surface area) was determined to be in the range of 0.5 × 10 −8 to 5 × 10 8 , increasing linearly with HCHO concentration (1 × 10 13 to 2 × 10 14 molecule cm −3 ).…”

Section: Hchomentioning

confidence: 99%

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Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

et al. 2017

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Abstract. Heterogeneous reactions of mineral dust aerosol with trace gases in the atmosphere could directly and indirectly affect tropospheric oxidation capacity, in addition to aerosol composition and physicochemical properties. In this article we provide a comprehensive and critical review of laboratory studies of heterogeneous uptake of OH, NO 3 , O 3 , and their directly related species as well (including HO 2 , H 2 O 2 , HCHO, HONO, and N 2 O 5 ) by mineral dust particles. The atmospheric importance of heterogeneous uptake as sinks for these species is assessed (i) by comparing their lifetimes with respect to heterogeneous reactions with mineral dust to lifetimes with respect to other major loss processes and (ii) by discussing relevant field and modeling studies. We have also outlined major open questions and challenges in laboratory studies of heterogeneous uptake by mineral dust and discussed research strategies to address them in order to better understand the effects of heterogeneous reactions with mineral dust on tropospheric oxidation capacity.

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Section: Kc-msmentioning

confidence: 95%

Section: Hchomentioning

confidence: 99%

Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

et al. 2017

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“…For example, γ (H 2 O 2 ) onto TiO 2 particles decreases with increasing RH for RH below 40 %, but a further increase in RH does not cause any change of the uptake coefficient of H 2 O 2 (Pradhan et al, 2010). γ (HCHO) onto TiO 2 particles under irradiated conditions (340-420 nm) increases with RH when RH is below 40 %, and a further increase in RH causes the reduction of γ (HCHO) (Sassine et al, 2010). A close inspection of Fig.…”

Section: Effects Of Relative Humiditymentioning

confidence: 99%

Heterogeneous reaction of N2O5 with airborne TiO2 particles and its implication for stratospheric particle injection

et al. 2014

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Abstract. Injection of aerosol particles (or their precursors) into the stratosphere to scatter solar radiation back into space has been suggested as a solar-radiation management scheme for the mitigation of global warming. TiO 2 has recently been highlighted as a possible candidate particle because of its high refractive index, but its impact on stratospheric chemistry via heterogeneous reactions is as yet unknown. In this work the heterogeneous reaction of airborne submicrometre TiO 2 particles with N 2 O 5 has been investigated for the first time, at room temperature and different relative humidities (RH), using an atmospheric pressure aerosol flow tube. The uptake coefficient of N 2 O 5 onto TiO 2 , γ (N 2 O 5 ), was determined to be ∼ 1.0 × 10 −3 at low RH, increasing to ∼ 3 × 10 −3 at 60 % RH. The uptake of N 2 O 5 onto TiO 2 is then included in the UKCA chemistry-climate model to assess the impact of this reaction on stratospheric chemistry. While the impact of TiO 2 on the scattering of solar radiation is chosen to be similar to the aerosol from the Mt Pinatubo eruption, the impact of TiO 2 injection on stratospheric N 2 O 5 is much smaller.

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“…During experiments performed under tropospheric conditions by Kroll et al (2005), no uptake of HCHO by aerosols was observed. However, some laboratory (Sassine et al, 2010;Li et al, 2011) and field Toda et al, 2014) studies identified loss of HCHO on tropospheric aerosols under certain conditions. Therefore, it is possible that the use of 10 −3 as the HCHO uptake coefficient could not well represent the condition at the BG site.…”

Section: Reconciliation Between the Modeled And The Measured Hcho Andmentioning

confidence: 99%

“…However, the existence of this process in the lower troposphere is still under discussion. Laboratory experiments indicate reactive loss of HCHO can happen on surfaces of H 2 SO 4 aerosols (Jayne et al, 1996), mineral dust aerosols (Sassine et al, 2010), and organic aerosols (Li et al, 2011). Field observations by Wang et al (2010) suggest an uptake of HCHO by aerosols in the presence of amines (or ammonia) and carbonyl compounds.…”

Section: Introductionmentioning

confidence: 99%

Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign

Rohrer²,

Brauers³

et al. 2014

Atmos. Chem. Phys.

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Abstract. HCHO and CHOCHO are important trace gases in the atmosphere, serving as tracers of VOC oxidations. In the past decade, high concentrations of HCHO and CHOCHO have been observed for the Pearl River Delta (PRD) region in southern China. In this study, we performed box model simulations of HCHO and CHOCHO at a semi-rural site in the PRD, focusing on understanding their sources and sinks and factors influencing the CHOCHO to HCHO ratio (R GF ). The model was constrained by the simultaneous measurements of trace gases and radicals. Isoprene oxidation by OH radicals is the major pathway forming HCHO, followed by degradations of alkenes, aromatics, and alkanes. The production of CHOCHO is dominated by isoprene and aromatic degradation; contributions from other NMHCs are of minor importance. Compared to the measurement results, the model predicts significant higher HCHO and CHOCHO concentrations. Sensitivity studies suggest that fresh emissions of precursor VOCs, uptake of HCHO and CHOCHO by aerosols, fast vertical transport, and uncertainties in the treatment of dry deposition all have the potential to contribute significantly to this discrepancy. Our study indicates that, in addition to chemical considerations (i.e., VOC composition, OH and NO x levels), atmospheric physical processes (e.g., transport, dilution, deposition) make it difficult to use the CHOCHO to HCHO ratio as an indicator for the origin of air mass composition.

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Kinetics of the tropospheric formaldehyde loss onto mineral dust and urban surfaces

Cited by 31 publications

References 40 publications

Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with airborne TiO<sub>2</sub> particles and its implication for stratospheric particle injection

Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign

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Kinetics of the tropospheric formaldehyde loss onto mineral dust and urban surfaces

Cited by 31 publications

References 40 publications

Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

Heterogeneous reactions of mineral dust aerosol: implications for tropospheric oxidation capacity

Heterogeneous reaction of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; with airborne TiO&lt;sub&gt;2&lt;/sub&gt; particles and its implication for stratospheric particle injection

Modeling of HCHO and CHOCHO at a semi-rural site in southern China during the PRIDE-PRD2006 campaign

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Heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> with airborne TiO<sub>2</sub> particles and its implication for stratospheric particle injection