English Abstract In this report the results are presented of
measurements with a SO2 dry deposition monitoring system based on the
micrometeorological gradient technique at two locations in the Netherlands.
From these results dry deposition fluxes, dry deposition velocities and
surface resistances for a heathland and for an agricultural grassland site
have been estimated using a selected set of data and a calculation procedure
based on micrometeorological theory. An extensive uncertainty analysis has
been made to determine uncertainties in the resulting deposition parameters.
From this analysis it is concluded that the uncertainty in the deposition
parameters is almost completely determined by the measurement of the
concentration gradient. The meteorological surface exchange parameters can
be estimated sufficiently accurate (< 20% uncertainty). At the grassland
site (Zegveld) an average surface resistance Rc to deposition of 6 (+-8) s
m-1 and 13 (+-12)s m-1 has been estimated for wet and dry conditions,
respectively. At the heather location (Elspeetsche Veld) also a distinct
difference between Rc values for wet and dry conditions has been found.
These values are 20 (+-21) s m-1 and 70 (+-90) s m-1, respectively. The
yearly average dry deposition flux for SO2 at Zegveld amounts to 585 (+-330)
mol ha-1 a-1, while at Elspeetsche Veld the yearly average flux was 300
(+-270) mol ha-1a-1. The yearly average dry deposition velocity was 1.2
(+-0.3) cm s-1 at zegveld and 0.8 (+-0.4)cm s-1 at Elspeetsche
Veld.
