Abstract
A 7-year-long data set of integrated high-precision 14CO{sub 2} observations combined with occasional hourly 14CO{sub 2} flask data from the Heidelberg sampling site is presented. Heidelberg is located in the highly populated and industrialized upper Rhine valley in southwestern Germany. The 14CO{sub 2} data are used in combination with hourly carbon monoxide (CO) observations to estimate regional hourly fossil fuel CO{sub 2} (DELTAFFCO{sub 2}) mixing ratios. We investigate three different 14C calibration schemes to calculate DELTAFFCO{sub 2}: (1) the long-term median DELTACO/DELTAFFCO{sub 2} ratio of 14.6 ppb ppm-1 (mean: 15.5 +- 5.6 ppb ppm-1), (2) individual (2-)week-long integrated DELTACO/DELTAFFCO{sub 2} ratios, which take into account the large week-to-week variability of +- 5.6 ppb ppm-1 (1sigma; interquartile range: 5.5 ppb ppm-1), and (3) a calibration which also includes diurnal changes of the DELTACO/DELTAFFCO{sub 2} ratio. We show that in winter a diurnally changing DELTACO/DELTAFFCO{sub 2} ratio provides a much better agreement with the direct 14C-based hourly DELTAFFCO{sub 2} estimates whereas summer values are not significantly improved with a diurnal calibration. Using integrated 14CO{sub 2} samples to determine weekly mean DELTACO/DELTAFFCO{sub 2} ratios introduces a bias in the CO-based DELTAFFCO{sub 2} estimates which can be corrected for with diurnal grab sample data.
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Vogel, Felix R;
Hammer, Samuel;
Levin, Ingeborg;
[1]
Steinhof, Axel;
[2]
Kromer, Bernd;
[1]
Heidelberger Akademie der Wissenschaften, Heidelberg (Germany))
- Institut fuer Umweltphysik, Ruprecht-Karls-Universitaet Heidelberg, Heidelberg (Germany)
- Max-Planck-Institut fuer Biogeochemie, Jena (Germany)
Citation Formats
Vogel, Felix R, Hammer, Samuel, Levin, Ingeborg, Steinhof, Axel, Kromer, Bernd, and Heidelberger Akademie der Wissenschaften, Heidelberg (Germany)).
Implication of weekly and diurnal 14C calibration on hourly estimates of CO-based fossil fuel CO{sub 2} at a moderately polluted site in southwestern Germany.
Sweden: N. p.,
2010.
Web.
doi:10.1111/J.1600-0889.2010.00477.X.
Vogel, Felix R, Hammer, Samuel, Levin, Ingeborg, Steinhof, Axel, Kromer, Bernd, & Heidelberger Akademie der Wissenschaften, Heidelberg (Germany)).
Implication of weekly and diurnal 14C calibration on hourly estimates of CO-based fossil fuel CO{sub 2} at a moderately polluted site in southwestern Germany.
Sweden.
https://doi.org/10.1111/J.1600-0889.2010.00477.X
Vogel, Felix R, Hammer, Samuel, Levin, Ingeborg, Steinhof, Axel, Kromer, Bernd, and Heidelberger Akademie der Wissenschaften, Heidelberg (Germany)).
2010.
"Implication of weekly and diurnal 14C calibration on hourly estimates of CO-based fossil fuel CO{sub 2} at a moderately polluted site in southwestern Germany."
Sweden.
https://doi.org/10.1111/J.1600-0889.2010.00477.X.
@misc{etde_1010802,
title = {Implication of weekly and diurnal 14C calibration on hourly estimates of CO-based fossil fuel CO{sub 2} at a moderately polluted site in southwestern Germany}
author = {Vogel, Felix R, Hammer, Samuel, Levin, Ingeborg, Steinhof, Axel, Kromer, Bernd, and Heidelberger Akademie der Wissenschaften, Heidelberg (Germany))}
abstractNote = {A 7-year-long data set of integrated high-precision 14CO{sub 2} observations combined with occasional hourly 14CO{sub 2} flask data from the Heidelberg sampling site is presented. Heidelberg is located in the highly populated and industrialized upper Rhine valley in southwestern Germany. The 14CO{sub 2} data are used in combination with hourly carbon monoxide (CO) observations to estimate regional hourly fossil fuel CO{sub 2} (DELTAFFCO{sub 2}) mixing ratios. We investigate three different 14C calibration schemes to calculate DELTAFFCO{sub 2}: (1) the long-term median DELTACO/DELTAFFCO{sub 2} ratio of 14.6 ppb ppm-1 (mean: 15.5 +- 5.6 ppb ppm-1), (2) individual (2-)week-long integrated DELTACO/DELTAFFCO{sub 2} ratios, which take into account the large week-to-week variability of +- 5.6 ppb ppm-1 (1sigma; interquartile range: 5.5 ppb ppm-1), and (3) a calibration which also includes diurnal changes of the DELTACO/DELTAFFCO{sub 2} ratio. We show that in winter a diurnally changing DELTACO/DELTAFFCO{sub 2} ratio provides a much better agreement with the direct 14C-based hourly DELTAFFCO{sub 2} estimates whereas summer values are not significantly improved with a diurnal calibration. Using integrated 14CO{sub 2} samples to determine weekly mean DELTACO/DELTAFFCO{sub 2} ratios introduces a bias in the CO-based DELTAFFCO{sub 2} estimates which can be corrected for with diurnal grab sample data. Altogether our 14C-calibrated CO-based method allows determining DELTAFFCO{sub 2} at a semi-polluted site with a precision of approximately +- 25%}
doi = {10.1111/J.1600-0889.2010.00477.X}
journal = []
issue = {5}
volume = {62B}
place = {Sweden}
year = {2010}
month = {Nov}
}
title = {Implication of weekly and diurnal 14C calibration on hourly estimates of CO-based fossil fuel CO{sub 2} at a moderately polluted site in southwestern Germany}
author = {Vogel, Felix R, Hammer, Samuel, Levin, Ingeborg, Steinhof, Axel, Kromer, Bernd, and Heidelberger Akademie der Wissenschaften, Heidelberg (Germany))}
abstractNote = {A 7-year-long data set of integrated high-precision 14CO{sub 2} observations combined with occasional hourly 14CO{sub 2} flask data from the Heidelberg sampling site is presented. Heidelberg is located in the highly populated and industrialized upper Rhine valley in southwestern Germany. The 14CO{sub 2} data are used in combination with hourly carbon monoxide (CO) observations to estimate regional hourly fossil fuel CO{sub 2} (DELTAFFCO{sub 2}) mixing ratios. We investigate three different 14C calibration schemes to calculate DELTAFFCO{sub 2}: (1) the long-term median DELTACO/DELTAFFCO{sub 2} ratio of 14.6 ppb ppm-1 (mean: 15.5 +- 5.6 ppb ppm-1), (2) individual (2-)week-long integrated DELTACO/DELTAFFCO{sub 2} ratios, which take into account the large week-to-week variability of +- 5.6 ppb ppm-1 (1sigma; interquartile range: 5.5 ppb ppm-1), and (3) a calibration which also includes diurnal changes of the DELTACO/DELTAFFCO{sub 2} ratio. We show that in winter a diurnally changing DELTACO/DELTAFFCO{sub 2} ratio provides a much better agreement with the direct 14C-based hourly DELTAFFCO{sub 2} estimates whereas summer values are not significantly improved with a diurnal calibration. Using integrated 14CO{sub 2} samples to determine weekly mean DELTACO/DELTAFFCO{sub 2} ratios introduces a bias in the CO-based DELTAFFCO{sub 2} estimates which can be corrected for with diurnal grab sample data. Altogether our 14C-calibrated CO-based method allows determining DELTAFFCO{sub 2} at a semi-polluted site with a precision of approximately +- 25%}
doi = {10.1111/J.1600-0889.2010.00477.X}
journal = []
issue = {5}
volume = {62B}
place = {Sweden}
year = {2010}
month = {Nov}
}