Revisiting enteric methane emissions from domestic ruminants and their δ¹³C_CH4 source signature.

ABSTRACT: Accurate knowledge of ¹³C isotopic signature (δ¹³C) of methane from each source is crucial for separating biogenic, fossil fuel and pyrogenic emissions in bottom-up and top-down methane budget. Livestock production is the largest anthropogenic source in the global methane budget, mostly from enteric fermentation of domestic ruminants. However, the global average, geographical distribution and temporal variations of the δ¹³C of enteric emissions are not well understood yet. Here, we provide a new estimation of C3-C4 diet composition of domestic ruminants (cattle, buffaloes, goats and sheep), a revised estimation of yearly enteric CH₄ emissions, and a new estimation for the evolution of its δ¹³C during the period 1961-2012. Compared to p

SUBMITTER: Chang J 

PROVIDER: S-EPMC6668425 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature