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SAWNUC (Sulphuric Acid Water Nucleation) is a model of binary nucleation that is based on laboratory measurements of the binding energies of sulphuric acid and water in charged and neutral clusters. Predictions of SAWNUC are compared for the first time comprehensively with experimental binary nucleation data from the CLOUD chamber at European Organization for Nuclear Research. The experimental measurements span a temperature range of 208\u2013292\u00a0K, sulphuric acid concentrations from 1\u00b710<jats:sup>6<\/jats:sup> to 1\u00b710<jats:sup>9<\/jats:sup>\u00a0cm<jats:sup>\u22123<\/jats:sup>, and distinguish between ion\u2010induced and neutral nucleation. Good agreement, within a factor of 5, is found between the experimental and modeled formation rates for ion\u2010induced nucleation at 278\u00a0K and below and for neutral nucleation at 208 and 223\u00a0K. Differences at warm temperatures are attributed to ammonia contamination which was indicated by the presence of ammonia\u2010sulphuric acid clusters, detected by an Atmospheric Pressure Interface Time of Flight (APi\u2010TOF) mass spectrometer. APi\u2010TOF measurements of the sulphuric acid ion cluster distributions (\n<jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/jgrd53016-math-0001.png\" xlink:title=\"urn:x-wiley:jgrd:media:jgrd53016:jgrd53016-math-0001\"\/> with i = 0, 1, ..., 10) show qualitative agreement with the SAWNUC ion cluster distributions. Remaining differences between the measured and modeled distributions are most likely due to fragmentation in the APi\u2010TOF. The CLOUD results are in good agreement with previously measured cluster binding energies and show the SAWNUC model to be a good representation of ion\u2010induced and neutral binary nucleation of sulphuric acid\u2010water clusters in the middle and upper troposphere.<\/jats:p>","DOI":"10.1002\/2015jd023723","type":"journal-article","created":{"date-parts":[[2016,10,27]],"date-time":"2016-10-27T15:20:49Z","timestamp":1477581649000},"source":"Crossref","is-referenced-by-count":16,"title":["Comparison of the SAWNUC model with CLOUD measurements of sulphuric acid\u2010water nucleation"],"prefix":"10.1029","volume":"121","author":[{"given":"Sebastian","family":"Ehrhart","sequence":"first","affiliation":[{"name":"Goethe University Frankfurt Institute for Atmospheric and Environmental Sciences  Frankfurt am Main Germany"},{"name":"CERN  Geneva Switzerland"}]},{"given":"Luisa","family":"Ickes","sequence":"additional","affiliation":[{"name":"Goethe University Frankfurt Institute for 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