Geoscientific Model Development Discussions www.geosci-model-dev-discuss.net 1991-9611 1991-962X 3 3 2010 10.5194/gmdd-3-1271-2010 http://www.geosci-model-dev-discuss.net/3/1271/2010/ http://www.geosci-model-dev-discuss.net/3/1271/2010/gmdd-3-1271-2010.html http://www.geosci-model-dev-discuss.net/3/1271/2010/gmdd-3-1271-2010.pdf 1271 1315 2010-08-19 Adaptive method of lines for multi-component aerosol condensational growth and cloud droplet activation S. Arabas sarabas@igf.fuw.edu.pl H. Pawlowska Institute of Geophysics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland The process of formation of cloud droplets on an ensemble of aerosol particles is modelled by numerous investigators using the method of lines (MOL). The method involves discretization of the aerosol size spectrum into bins whose position and width evolve with time. One of the drawbacks of the method is its poor representation of the aerosol spectrum shape in the region between the unactivated aerosol mode and the activated cloud-droplet mode. An adaptive spectrum refinement procedure that improves the performance of the method is introduced and tested. A model of drop formation on multi-component aerosol is formulated for the purpose of the study. Model formulation includes explicit treatment of the drop temperature evolution. Several examples of the model set-up are used to demonstrate model capabilities. Model results are compared to those without adaptivity, and are compared to the Twomey's formul\ae. A C++ implementation of the model is available as an electronic supplement of the paper. Aitken,~J.: On boiling, condensing, freezing, and melting, T Roy. Scott. Soc. Arts, 9, 7–17, (reprinted in: The Collected Scientific Papers of John Aitken, LLD, FRS, edited by: Knott,~C G., Cambridge Univ. Press, 1923), 1875. 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