the influence of 14co2 releases from regional nuclear facilities at the heidelberg 14co2 sampling site (1986–2014)
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2018
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Abstract
Atmospheric Δ14CO2 measurements are a
well-established tool to estimate the regional fossil-fuel-derived
CO2 component. However, emissions from nuclear facilities can
significantly alter the regional Δ14CO2 level. In order to
accurately quantify the signal originating from fossil CO2 emissions, a
correction term for anthropogenic 14CO2 sources has to be
determined. In this study, the HYSPLIT atmospheric dispersion model has been
applied to calculate this correction for the long-term Δ14CO2 monitoring site in Heidelberg. Wind fields with a spatial
resolution of 2.5° × 2.5°,
1° × 1°, and 0.5° × 0.5° show systematic deviations, with coarser
resolved wind fields leading to higher mean values for the correction. The
finally applied mean Δ14CO2 correction for the period from
1986–2014 is 2.3 ‰ with a standard deviation of 2.1 ‰
and maximum values up to 15.2 ‰.
These results are based on the 0.5° × 0.5° wind field
simulations in years when these fields were available (2009, 2011–2014), and
for the other years they are based on 2.5° × 2.5° wind
field simulations, corrected with a factor of 0.43. After operations at the
Philippsburg boiling water reactor ceased in 2011, the monthly nuclear
correction terms decreased to less than 2 ‰, with a
mean value of 0.44 ± 0.32 ‰ from 2012 to 2014.
| Reference Key |
kuderer2018atmosphericthe
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|---|---|
| Authors | ;M. Kuderer;S. Hammer;I. Levin |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-7951-2018
|
| URL | |
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