Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
21
2009
10.5194/acp-9-8559-2009
http://www.atmos-chem-phys.net/9/8559/2009/
http://www.atmos-chem-phys.net/9/8559/2009/acp-9-8559-2009.html
http://www.atmos-chem-phys.net/9/8559/2009/acp-9-8559-2009.pdf
8559
8571
2009-11-11
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<sub>d</sub></i>) 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<sub>d</sub></i> in
nighttime when photochemical reactions were minimal and radon gas was
concentrated in the shallow boundary layer due to exhalation from soil. A
two-dimensional atmospheric model was used for the calculation of respective
<i>v<sub>d</sub></i> values and radon exhalation rates. The <i>v<sub>d</sub></i> and radon exhalation
rates were lower in winter than in summer according to all methods. The
radon tracer method and the two-dimensional model results for hydrogen
deposition velocity were in the range of 0.13 mm s<sup>−1</sup> to 0.93 mm s<sup>−1</sup>
(radon tracer) and 0.12 mm s<sup>−1</sup> to 0.61 mm s<sup>−1</sup> (two-dimensional).
The soil chamber results for <i>v<sub>d</sub></i> were 0.00 mm s<sup>−1</sup> to 0.70 mm s<sup>−1</sup>.
Both models and chamber measurements revealed a relation between
one week cumulative rain sum and deposition velocity. When precipitation
events occurred a few days before the chamber measurements, lower <i>v<sub>d</sub></i>
values were observed. A snow cover also lowered <i>v<sub>d</sub></i>.
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