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- Title
Global Atmospheric δ 13 CH 4 and CH 4 Trends for 2000–2020 from the Atmospheric Transport Model TM5 Using CH 4 from Carbon Tracker Europe–CH 4 Inversions.
- Authors
Mannisenaho, Vilma; Tsuruta, Aki; Backman, Leif; Houweling, Sander; Segers, Arjo; Krol, Maarten; Saunois, Marielle; Poulter, Benjamin; Zhang, Zhen; Lan, Xin; Dlugokencky, Edward J.; Michel, Sylvia; White, James W. C.; Aalto, Tuula
- Abstract
This study investigates atmospheric δ 13 CH 4 trends, as produced by a global atmospheric transport model using CH 4 inversions from CarbonTracker-Europe CH 4 for 2000–2020, and compares them to observations. The CH 4 inversions include the grouping of the emissions both by δ 13 CH 4 isotopic signatures and process type to investigate the effect, and to estimate the CH 4 magnitudes and model CH 4 and δ 13 CH 4 trends. In addition to inversion results, simulations of the global atmospheric transport model were performed with modified emissions. The estimated global CH 4 trends for oil and gas were found to increase more than coal compared to the priors from 2000–2006 to 2007–2020. Estimated trends for coal emissions at 30 ∘ N–60 ∘ N are less than 50% of those from priors. Estimated global CH 4 rice emissions trends are opposite to priors, with the largest contribution from the EQ to 60 ∘ N. The results of this study indicate that optimizing wetland emissions separately produces better agreement with the observed δ 13 CH 4 trend than optimizing all biogenic emissions simultaneously. This study recommends optimizing separately biogenic emissions with similar isotopic signature to wetland emissions. In addition, this study suggests that fossil-based emissions were overestimated by 9% after 2012 and biogenic emissions are underestimated by 8% in the inversion using EDGAR v6.0 as priors.
- Subjects
ATMOSPHERIC transport; ATMOSPHERIC models; ISOTOPIC signatures; WETLANDS; INVERSION (Geophysics); CARBON; COAL
- Publication
Atmosphere, 2023, Vol 14, Issue 7, p1121
- ISSN
2073-4433
- Publication type
Article
- DOI
10.3390/atmos14071121