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Interactive numerical modeling of the atmospheric water cycle and volcanic ash aggregation

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Langmann, B. (2013). Interactive numerical modeling of the atmospheric water cycle and volcanic ash aggregation. In 2nd IUGG-WMO workshop on Ash dispersal forecast and civil aviation, World Meteorological Organization: Book of Abstracts (pp. 81).

For improving the numerical modelling of volcanic ash atmospheric concentration by addressing volcanic ash aggregation processes and removal by wet deposition during long-range transport, an interdisciplinary approach by combining volcanic, meteorological, atmospheric and climate research is wishful. The application of the coupled on-line atmosphere-ash model REMOTE (Langmann et al., 2008; Langmann et al., 2010) is well beyond the current modelling strategy for volcanic ash dispersion and deposition as it offers the possibility to study feedback mechanisms between trace species and climate (Langmann, 2007). REMOTE explicitly determines cloud processes at every model time step so that e.g. ice formation on volcanic ash can directly alter precipitation formation. It is planned to use REMOTE to develop suitable algorithms for volcanic ash aggregation and wet deposition during long-range transport to be used in standard off-line volcanic ash forecast models. Neglecting volcanic ash aggregation mechanisms may lead to model results, which underestimate fine volcanic ash fallout and overestimate airborne ash concentrations during long-range transport.