An evaluation of the ADOM cloud module |
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| Authors: | Anna Glazer HG Leighton |
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| Institution: | 1. Department of Atmospheric and Oceanic Sciences , McGill University , Montréal, Québec;2. Atmospheric Environment Service, Cloud Physics Research Division , 2121 TransCanada Highway, Dorval, Quebec, H9P 1J3;3. Cooperative Centre for Research in Mesometeorology , McGill University , Montréal, Québec |
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| Abstract: | Abstract The Acid Deposition and Oxidant Model (ADOM) is an Eulerian long‐range transport and deposition model. One of the most highly parametrized and least well established parts of the model is the scavenging module that describes cloud formation, pollutant scavenging, aqueous‐phase chemistry and wet deposition. As a means of gaining insight into the scavenging module, results from simulations with the module are compared with the results from simulations for equivalent conditions with a three‐dimensional dynamic cloud chemistry model. Comparisons of results for a variety of initial conditions show that wet deposition of sulphate, nitrate and ammonium ions tend to be underpredicted by the scavenging module and that the pH of the rain is overpredicted. Although the differences are for the most part not large, they are sensitive to cloud top height. The amount of hydrogen peroxide deposited at the surface is significantly smaller in the ADOM module than in the cloud chemistry model. For the particular conditions that are considered, oxidation is limited by the hydrogen peroxide concentration for the cloud chemistry model, but by the sulphur dioxide concentration for the ADOM module. |
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