Estimation of Gaseous Mercury Emissions in Germany
391
Table 5. Accuracy of invers modelled source strengths of four source areas at BSL Werk Schkopau in
kg/d dependent on different uncertainties of the used measurements. Results for June 14, 1994
5.30 UTe
source
bc, = 10%
bc, = 30%
bc, = 50%
source I
10%
31%
52%
source 2
11%
30%
51%
source 3
7%
21%
35%
source 4
10%
31%
51%
the model grid, defined here as 50 by 20 m, the errors are assumed to be mainly
due to the representation of a grid element by a few or only one measurement
point inside such an area. The uncertainties of the emission source strengths are
strongly dependent on the representation of a grid element by the measurements,
which, in turn, is connected to the number and the location of the measurements.
7
Conclusions
Emissions of atmospheric mercury originating from closed production installations at the contaminated industrial site BSL Werk Schkopau were successfully
determined by using the method of inverse modelling. The method, whose good
performance was supported by several theoretical tests, has the advantage that
neighboured individual source strengths can be specified using field measurements.
Based on measurements in 1993 and 1994 the source strengths at BSL Werk
Schkopau of four inactive factories were calculated to be in the range between 0.2
and 1.7 kg/day. Since these emissions of atmospheric mercury compared to 1988
(Hellwig and Neske 1990) show a considerable reduction by a factor of 50, the
results are expected to be useful for the actualization of the European emission
inventory for mercury.
The significant change in the emission in this area after the reunion of
Germany implies that the strong south-to-north gradients of atmospheric
mercury concentrations over Europe found by Petersen et al. (1995) should be
more smoother since the closure of the factories at the BSL Werk Schkopau.
Further regional transport modelling using updated emission inventories with
regard to specification of the south to north transmission is motivated by this
study.
The method itself was quite useful for experimental planning, because the
number of measurements which are needed for a successful source strength
estimation, including the location of the measurements, can be simulated on the
computer. This can be done before the field experiments are performed.
Therefore the method is recommended for experimental planning of measurement campaigns near emission sources.
391
Table 5. Accuracy of invers modelled source strengths of four source areas at BSL Werk Schkopau in
kg/d dependent on different uncertainties of the used measurements. Results for June 14, 1994
5.30 UTe
source
bc, = 10%
bc, = 30%
bc, = 50%
source I
10%
31%
52%
source 2
11%
30%
51%
source 3
7%
21%
35%
source 4
10%
31%
51%
the model grid, defined here as 50 by 20 m, the errors are assumed to be mainly
due to the representation of a grid element by a few or only one measurement
point inside such an area. The uncertainties of the emission source strengths are
strongly dependent on the representation of a grid element by the measurements,
which, in turn, is connected to the number and the location of the measurements.
7
Conclusions
Emissions of atmospheric mercury originating from closed production installations at the contaminated industrial site BSL Werk Schkopau were successfully
determined by using the method of inverse modelling. The method, whose good
performance was supported by several theoretical tests, has the advantage that
neighboured individual source strengths can be specified using field measurements.
Based on measurements in 1993 and 1994 the source strengths at BSL Werk
Schkopau of four inactive factories were calculated to be in the range between 0.2
and 1.7 kg/day. Since these emissions of atmospheric mercury compared to 1988
(Hellwig and Neske 1990) show a considerable reduction by a factor of 50, the
results are expected to be useful for the actualization of the European emission
inventory for mercury.
The significant change in the emission in this area after the reunion of
Germany implies that the strong south-to-north gradients of atmospheric
mercury concentrations over Europe found by Petersen et al. (1995) should be
more smoother since the closure of the factories at the BSL Werk Schkopau.
Further regional transport modelling using updated emission inventories with
regard to specification of the south to north transmission is motivated by this
study.
The method itself was quite useful for experimental planning, because the
number of measurements which are needed for a successful source strength
estimation, including the location of the measurements, can be simulated on the
computer. This can be done before the field experiments are performed.
Therefore the method is recommended for experimental planning of measurement campaigns near emission sources.