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Identifier uch.chemistry.msc//2004sfakianaki
Title Προσομοίωση της χημικής σύστασης των αιωρούμενω σωματιδίων στο στρώμα ανάμιξης στην Ανατ. Μεσόγειο με τη χρήση θερμοδυναμικού μοντέλου
Creator Sfakianaki, Maria Em
Abstract Aerosols are known to have a significant role in the atmosphere, having adverse impacts on human health and directly affecting air quality, visibility and climate change. To better understand such processes, accurate methods in predicting atmospheric aerosol composition are essential. One of the most challenging tasks for the available models is the prediction of the partitioning of the volatile inorganic aerosol components (ammonia, nitric acid, water etc.) between the gas and aerosol phases. GFEMN, a thermodynamic model, relying on adjusted thermodynamic parameters of solid salts and a state of the art activity coefficient model, directly minimizes the Gibbs free energy (according to thermodynamic principles) given temperature, relative humidity and the total (gas plus aerosol) ammonia, nitric acid, sulfate, sodium and hydrochloric acid concentrations. Predictions of GFEMN are compared against measurements conducted at Finokalia in Crete (35033΄N, 25067΄Ε) during the Mediterranean Intensive Oxidant Study (MINOS), performed in the summer of 2001. The results showed that the equilibrium assumption introduces errors in the calculation of the coarse mode. Investigating the possible sources of the observed discrepancies, it appears that a dynamic instead of an equilibrium approach is more suitable for these particles. Also, the inclusion of crustal species is important in modeling the size distribution of coarse inorganic aerosols when the concentrations of theses species is high. A hybrid approach that will utilize equilibrium assumptions for the fine aerosol modes and the dynamic approach for the coarse aerosol mode, is expected to improve the approach of the chemical constitution and the distribution of components between the gas and aerosol phase.
Issue date 2004-07-01
Date available 2004-07-27
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/0/3/a/metadata-dlib-2004sfakianaki_mar.tkl Bookmark and Share
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