Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-14873-2009 http://www.atmos-chem-phys-discuss.net/9/14873/2009/ http://www.atmos-chem-phys-discuss.net/9/14873/2009/acpd-9-14873-2009.html http://www.atmos-chem-phys-discuss.net/9/14873/2009/acpd-9-14873-2009.pdf 14873 14899 2009-07-09 Hydrogen soil deposition at an urban site in Finland M. Lallo marko.lallo@fmi.fi T. Aalto J. Hatakka T. Laurila Finnish Meteorological Institute, Helsinki, Finland Hydrogen deposition velocities (<i>v</i>_d) were estimated by field chamber measurements and model simulations. A closed-chamber method was used for soil deposition studies in Helsinki, Finland, at an urban park inhabited by broad-leaved trees. Radon tracer method was used to estimate the <i>v_</i>d in nighttime when photochemical reactions were minimal and radon gas was concentrated to shallow boundary layer due to exhalation from soil. A two-dimensional atmospheric model was used for calculation of respective <i>v_</i>d values and radon exhalation rate. <i>v_</i>d and radon exhalation rates were lower in winter than in summer according to all methods. The radon tracer method and two-dimensional model results for hydrogen deposition velocity were in the range of 0.13 mm s^&minus;1 to 0.90 mm s^&minus;1 (radon tracer) and 0.12 mm s^&minus;1 to 0.61 mm s^&minus;1 (two-dimensional). The soil chamber results for <i>v_</i>d were 0.00 mm s^&minus;1 to 0.70 mm s^&minus;1. Both models and chamber measurements revealed relation between one week cumulative rain sum and deposition velocity. Lower <i>v_</i>d values were usually measured in high soil moisture conditions. Precipitation occurring a few days before chamber measurements decreased <i>v_</i>d values. The snow cover also lowered <i>v_</i>d. 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