Uncertainty of continuous ∆CO-based ∆ffCO2 estimates derived from 14C flask and bottom-up ∆CO/∆ffCO2 ratios
<p><strong class="journal-contentHeaderColor">Abstract.</strong> Measuring the <sup>14</sup>C / C depletion in atmospheric CO<sub>2</sub> compared to a clean-air reference is the most direct way to estimate the recently added CO<sub>2</sub...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
14 June 2023
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| In: |
EGUsphere
Year: 2023, Pages: 1-31 |
| DOI: | 10.5194/egusphere-2023-1237 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.5194/egusphere-2023-1237 Verlag, kostenfrei, Volltext: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1237/ 
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| Verfasserangaben: | Fabian Manuel Maier, Ingeborg Levin, Sébastien Conil, Maksym Gachkivskyi, Hugo Denier van der Gon, and Samuel Hammer |
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| 245 | 1 | 0 | |a Uncertainty of continuous ∆CO-based ∆ffCO2 estimates derived from 14C flask and bottom-up ∆CO/∆ffCO2 ratios |c Fabian Manuel Maier, Ingeborg Levin, Sébastien Conil, Maksym Gachkivskyi, Hugo Denier van der Gon, and Samuel Hammer |
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| 246 | 3 | 3 | |a Uncertainty of continuous deltaCO-based deltaffCO 2 estimates derived from 14 C flask and bottom-up deltaCO/deltaffCO 2 ratios |
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| 520 | |a <p><strong class="journal-contentHeaderColor">Abstract.</strong> Measuring the <sup>14</sup>C / C depletion in atmospheric CO<sub>2</sub> compared to a clean-air reference is the most direct way to estimate the recently added CO<sub>2</sub> contribution from fossil fuel (ff) combustion (∆ffCO<sub>2</sub>) in ambient air. However, since <sup>14</sup>CO<sub>2</sub> measurements cannot be conducted continuously nor remotely, there are only very sparse <sup>14</sup>C-based ∆ffCO<sub>2</sub> estimates available. Continuously measured tracers like carbon monoxide (CO), which are co-emitted with ffCO<sub>2</sub> can be used as additional alternative proxies for ∆ffCO<sub>2</sub>, provided that the ∆CO / ∆ffCO<sub>2</sub> ratios can be determined correctly. Here, we use almost 350 <sup>14</sup>CO<sub>2</sub> measurements from flask samples collected between 2019 and 2020 at the urban site Heidelberg in Germany, and corresponding analyses from more than 50 afternoon flasks collected between September 2020 and March 2021 at the rural ICOS site Observatoire pérenne de l'environnement (OPE) in France, to calculate average ∆CO / ∆ffCO<sub>2</sub> ratios for those sites. By dividing the hourly ∆CO excess observations by the averaged flask ratio, we construct continuous and bias-free ∆CO-based ∆ffCO<sub>2</sub> records. The comparison between ∆CO-based ∆ffCO<sub>2</sub> and <sup>14</sup>C-based ∆ffCO<sub>2</sub> from the flasks yields a root-mean-square deviation (RMSD) of about 4 ppm for the urban site Heidelberg and of 1.5 ppm for the rural site OPE. While for OPE this uncertainty can be explained by observational uncertainties alone, for Heidelberg about half of the uncertainty is caused by the neglected variability of the ∆CO/∆ffCO<sub>2</sub> ratios. We further show that modelled ratios based on a bottom-up European emission inventory would lead to substantial biases in the ΔCO-based ∆ffCO<sub>2</sub> estimates for Heidelberg, and also for OPE. This highlights the need for an ongoing observational calibration/validation of inventory-based ratios, if those shall be applied for large-scale ΔCO-based ∆ffCO<sub>2</sub> estimates, e.g. from satellites.</p> | ||
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