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- Title
Quantification of fossil fuel CO2 from combined CO, δ13CO2 and Δ14CO2 observations.
- Authors
Kim, Jinsol; Miller, John B.; Miller, Charles E.; Lehman, Scott J.; Michel, Sylvia E.; Yadav, Vineet; Rollins, Nick E.; Berelson, William M.
- Abstract
We present a new method for partitioning observed CO 2 enhancements (CO 2 xs) into fossil and biospheric fractions (Cff and Cbio) based on measurements of CO and δ13 CO 2 , complemented by flask-based Δ14 CO 2 measurements. This method additionally partitions the fossil fraction into natural gas and petroleum fractions (when coal combustion is insignificant). Although here we apply the method only to discrete flask air measurements, the advantage of this method (CO- and δ13 CO 2 -based method) is that CO 2 xs partitioning can be applied at high frequency when continuous measurements of CO and δ13 CO 2 are available. High-frequency partitioning of CO 2 xs into Cff and Cbio has already been demonstrated using continuous measurements of CO (CO-based method) and Δ14 CO 2 measurements from flask air samples. We find that the uncertainty in Cff estimated from the CO- and δ13 CO 2 -based method averages 3.2 ppm (23 % of the mean Cff of 14.2 ppm estimated directly from Δ14 CO 2) , which is significantly less than the CO-based method which has an average uncertainty of 4.8 ppm (34 % of the mean Cff). Using measurements of CO, δ13 CO 2 and Δ14 CO 2 from flask air samples at three sites in the greater Los Angeles (LA) region, we find large contributions of biogenic sources that vary by season. On a monthly average, the biogenic signal accounts for - 14 to + 25 % of CO 2 xs with larger and positive contributions in winter and smaller and negative contributions in summer due to net respiration and net photosynthesis, respectively. Partitioning Cff into petroleum and natural gas combustion fractions reveals that the largest contribution of natural gas combustion generally occurs in summer, which is likely related to increased electricity generation in LA power plants for air-conditioning.
- Subjects
LOS Angeles (Calif.); CARBON dioxide; NATURAL gas; COAL combustion; COMBUSTION gases; ELECTRIC power production
- Publication
Atmospheric Chemistry & Physics, 2023, Vol 23, Issue 22, p14425
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-23-14425-2023