An Analysis of In-Cloud Scavenging

Dingle, A. Nelson; Yean, Lee,

doi:10.1175/1520-0450(1973)012<1295:aaoics>2.0.co;2

Cited by 23 publications

(7 citation statements)

References 9 publications

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“…The final process involves the removal of the aerosolcontaining cloud droplets produced by the first two processes by large falling hydrometeors at a rate /3i [Dingle and Lee, 1973;Slinn, 1984]. Assuming that an activation rate is Ai for size range i and that a,r and /3 i are constant within the integration interval, the in-cloud processes can be expressed by following ordinary differential equations: …”

Section: Generation Of Sea-salt Aerosolsmentioning

confidence: 99%

Modeling sea‐salt aerosols in the atmosphere: 1. Model development

Gong¹,

Barrie²,

Blanchet³

1997

J. Geophys. Res.

456

307

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Section: Generation Of Sea-salt Aerosolsmentioning

confidence: 99%

Modeling sea‐salt aerosols in the atmosphere: 1. Model development

Gong¹,

Barrie²,

Blanchet³

1997

J. Geophys. Res.

456

307

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“…chosen for fl_/F o as this resulted in/• values from the CCM runs of 10-'* to 10 -3 s-X, which is the range indicated by cloud model calculations [e.g.,Kessler, 1969;Dingle and Lee, 1973] and estimates based on observations [e.g.,Davis, 1972].For unstable precipitation, involving more impulsive systems such as the cumulonimbus, we have more simply set fl-const = 1.5x 10 -3 s-• (corresponding to a typical time of onset of precipitation of about 11 min [Ludlarn, 1980that our results are relatively insensitive to reasonable variations of these parameters. For instance, varying Fo from 0.6 to 1, l•_/F o from 10 -4 to 3 x 10 -4 s-• and T c from 15 to 35 min caused our calculated averaged lifetimes (see later) to vary by less than 25%.…”

mentioning

confidence: 99%

Rainout lifetimes of highly soluble aerosols and gases as inferred from simulations with a general circulation model

1986

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The rainout‐determined lifetimes of highly soluble particulate and gaseous atmospheric compounds are investigated using general circulation model simulations in which removal is explicitly calculated in terms of the local, model‐produced precipitation rates. Our calculations indicate that because of the episodic and asymmetric nature of rainout, species' lifetimes depend not only on the amount of precipitation but also on the characteristics of the precipitation regime (such as duration and frequency of the precipitation events) and on the direction of the tracer main flow (determined by the species' average mixing ratio gradient). For this reason, averaged rainout lifetimes of tracers flowing downward from the stratosphere are found to differ substantially from those of tracers of surface origin flowing upward or tracers of a more ubiquitous tropospheric source. These results imply that the use of a first‐order parameterization to simulate rainout in a photochemical model that does not explicitly calculate precipitation can be inadequate in representing this process. A computationally efficient parameterization that includes the effects of intermittence and asymmetry of rainout is proposed, and it is shown how this parameterization can be used to estimate rainout‐determined tropospheric residence times from observational data sets. A review of published estimates of submicron aerosol tropospheric residence times based on observations shows that these are consistent with our model results.

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“…2 for the description of the various processes at work between the three aerosol classes. Parameterizations developed for Brownian and turbulent diffusion rates are taken from Dingle and Lee (1973). The dynamical capture rate is calculated after Dana and Hales (1976).…”

Section: J5 Admentioning

confidence: 99%