A model of occult deposition applicable to complex terrain

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    Abstract

    A model is presented of the turbulent deposition of cloud water and dissolved species to regions of complex topography where cloud forms in contact with the ground. A three-dimensional airflow model (FLOWSTAR) which includes a treatment of atmospheric stability and boundary-layer turbulence is used. The deposition velocities of the cloud droplets to the terrain are calculated from recent measurements of cloud-water deposition to forest and moorland. It is found that good estimates of deposition may be obtained using the simplest cloud-water and chemistry models with deposition velocities parametrized in terms of a mean droplet radius. The results indicate that the deposition is a very strong function of position within the terrain. -from Authors
    Original languageEnglish
    Pages (from-to)803-823
    Number of pages20
    JournalQuarterly Journal of the Royal Meteorological Society
    Volume117
    Issue number500
    DOIs
    Publication statusPublished - 1991

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