Improved Constraints on Global Methane Emissions and Sinks Using δ ¹³C-CH₄.

ABSTRACT: We study the drivers behind the global atmospheric methane (CH₄) increase observed after 2006. Candidate emission and sink scenarios are constructed based on proposed hypotheses in the literature. These scenarios are simulated in the TM5 tracer transport model for 1984-2016 to produce three-dimensional fields of CH₄ and δ ¹³C-CH₄, which are compared with observations to test the competing hypotheses in the literature in one common model framework. We find that the fossil fuel (FF) CH₄ emission trend from the Emissions Database for Global Atmospheric Research 4.3.2 inventory does not agree with observed δ ¹³C-CH₄. Increased FF CH₄ emissions are unlikely to be the dominant driver for the pos

SUBMITTER: Lan X 

PROVIDER: S-EPMC8244052 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature