estimation of the fossil fuel component in atmospheric co2 based on radiocarbon measurements at the beromünster tall tower, switzerland
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ID: 206804
2017
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Abstract
Fossil fuel CO2 (CO2ff) is the major contributor
of anthropogenic CO2 in the atmosphere, and accurate quantification is
essential to better understand the carbon cycle. Since October 2012, we have
been continuously measuring the mixing ratios of CO, CO2, CH4, and
H2O at five different heights at the Beromünster tall tower,
Switzerland. Air samples for radiocarbon (Δ14CO2) analysis
have also been collected from the highest sampling inlet (212.5 m) of the
tower on a biweekly basis. A correction was applied for 14CO2
emissions from nearby nuclear power plants (NPPs), which have been simulated
with the Lagrangian transport model FLEXPART-COSMO. The 14CO2
emissions from NPPs offset the depletion in 14C by fossil fuel
emissions, resulting in an underestimation of the fossil fuel component in atmospheric
CO2 by about 16 %. An average observed ratio (RCO) of 13.4 ± 1.3 mmol mol−1
was calculated from the enhancements in CO mixing ratios
relative to the clean-air reference site Jungfraujoch (ΔCO) and the
radiocarbon-based fossil fuel CO2 mole fractions. The wintertime
RCO estimate of 12.5 ± 3.3 is about 30 % higher than the
wintertime ratio between in situ measured CO and CO2 enhancements at
Beromünster over the Jungfraujoch background (8.7 mmol mol−1) corrected for
non-fossil contributions due to strong biospheric contribution despite the
strong correlation between ΔCO and ΔCO2 in winter. By
combining the ratio derived using the radiocarbon measurements and the
in situ measured CO mixing ratios, a high-resolution time series of
CO2ff was calculated exhibiting a clear seasonality driven by seasonal
variability in emissions and vertical mixing. By subtracting the fossil fuel
component and the large-scale background, we have determined the regional
biospheric CO2 component that is characterized by seasonal variations
ranging between −15 and +30 ppm. A pronounced diurnal variation was observed
during summer modulated by biospheric exchange and vertical mixing, while no
consistent pattern was found during winter.
| Reference Key |
berhanu2017atmosphericestimation
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|---|---|
| Authors | ;T. A. Berhanu;S. Szidat;D. Brunner;E. Satar;R. Schanda;P. Nyfeler;M. Battaglia;M. Steinbacher;S. Hammer;M. Leuenberger |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-10753-2017
|
| URL | |
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