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. Formation of new particles in the atmosphere has importantimplications for air quality and climate. Recently, we have developed akinetically based H2SO4–H2O–NH3-ion nucleation modelwhich well captures the absolute values of nucleation rates as well asdependencies of nucleation rates on NH3 and H2SO4 concentrations, ionization rates, temperature, and relative humidityobserved in the well-controlled Cosmics Leaving Outdoor Droplets (CLOUD)measurements. Here we employ the aforementioned recently developed kineticnucleation model to generate nucleation rate lookup tables forH2SO4–H2O binary homogenous nucleation (BHN),H2SO4–H2O–NH3 ternary homogeneous nucleation (THN),H2SO4–H2O-ion binary ion-mediated nucleation (BIMN), andH2SO4–H2O–NH3-ion ternary ion-mediated nucleation(TIMN). A comparison of nucleation rates calculated using the lookup tableswith CLOUD measurements of BHN, BIMN, THN, and TIMN is presented. The lookuptables cover a wide range of key parameters controlling binary, ternary, andion-mediated nucleation in the Earth's atmosphere and are a cost-efficientsolution for multidimensional modeling. The lookup tables and FORTRANcodes, made available through this work, can be readily used in 3-Dmodeling. The lookup tables can also be used by experimentalists involved inlaboratory and field measurements for a quick assessment of nucleationinvolving H2SO4, H2O, NH3, and ions.

geoscientific model development

H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;SO&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;–H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O binary and H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;SO&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;–H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O–NH&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; ternary homogeneous and ion-mediated nucleation: lookup tables version 1.0 for 3-D modeling application