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  • 1
    Electronic Resource
    Electronic Resource
    On the scavenging of gaseous nitrogen compounds by large and small rain drops I. A wind tunnel and theoretical study of the uptake and desorption of NH3 in the presence of CO2 (1995)
    Springer
    Journal of atmospheric chemistry 21 (1995), S. 293-307 
    Details
    ISSN: 1573-0662
    Keywords: Gas scavenging ; ammonia ; absorption ; desorption ; convective diffusion models ; CO2-hydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract An experimental study has been carried out in the Mainz vertical wind tunnel to determine the rate at which NH3 in the presence of CO2 is absorbed by freely suspended water drops. The experimental uptake rates were found to be in good agreement with the rates predicted by the Kronig-Brink convective diffusion model and, for gas concentrations in the ppbv range also by the model in which it is assumed that the absorbed gas is well mixed inside the drop (henceforth called well mixed model). The same conclusion was shown to apply also to the desorption of NH3 from a drop previously exposed to NH3. The latter result is in contrast to the desorption of SO2 which must be described by a model which accounts for the diffusion of the species inside the drop. Comparison of our experimental results with theory show further that the uptake of NH3 in presence of CO2 is significantly overestimated if the slow reaction CO2(aq)+H2O⇌HCO 3 − +H+ is neglected in the theoretical computation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696760
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  • 2
    Electronic Resource
    Electronic Resource
    On the scavenging of gaseous nitrogen compounds by large and small rain drops: II. Wind tunnel and theoretical studies of the simultaneous uptake of NH3, SO2 and CO2 by water drops (1996)
    Springer
    Journal of atmospheric chemistry 24 (1996), S. 271-284 
    Details
    ISSN: 1573-0662
    Keywords: gas scavenging ; absorption ; sulfur dioxide ; ammonia ; plume washout ; CO2-hydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract An experimental investigation of the simultaneous absorption of NH3 and SO2 from the ambient atmosphere by freely falling water drops has been carried out in the Mainz vertical wind tunnel. The experimental results were found to be in good agreement with the results derived from computations with the Kronig-Brink convective diffusion model and also with a model which assumes a drop to be well mixed at all times. Encouraged by this agreement, these computation schemes for the uptake of gas by single drops where incorporated in a pollution washout model with realistic SO2, NH3 and CO2 gas profiles. This model allows an entire raindrop size distribution to fall through a gas layer. The results of this ‘plume-model’ show that the SO2 uptake is strongly dependent on the NH3 concentration in the atmosphere and on the rainrate. We also find that the small drops contribute more towards the washout of these gases. In the case of simultaneous presence of NH3 and SO2, desorption of these gases is negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210286
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