Global Methane budget (GMB)
The LOAC is a key component of the GMB. Our team has synthesized estimates of CH4 emissions from inland waters (IW: streams, rivers, ponds, lakes, reservoirs), estuaries and coastal vegetated ecosystems (ECV) and the global ocean (shelves, CS, and open ocean) using a consistent spatial framework. In the context of the upcoming GMB (Saunois et al., in prep) our assessment has been gridded, harmonized with wetlands estimates, and for the first time, decomposed into a natural and anthropogenic component flux.
Publications: Saunois et al., 2020; Saunois et al., ESSD, 2024
Leads: P. Raymond, P. Regnier
Regional budget
Present-day water-air CH4 emissions from inland waters (IW: streams, rivers, lakes, reservoirs etc…), estuaries and coastal vegetated ecosystems (ECV), and the continental shelves (CS) have been quantified and regionalized in the context of RECCAP2, using a fully consistent framework allowing their integration into land and ocean budgets. Climatological means are provided for IW, ECV and the ocean. Highlights include the large contribution of CH4 emissions in the GHG budget of IWs and the quantification of the extent to which these emissions offset the ECV and CS CO2 sinks.
Publications: Lauerwald et al. 2023a, Lauerwald et al., 2023b; Rosentreter et al., 2023; Resplandy et al., 2024
Leads: R. Lauerwald, L. Resplandy, J. Rosentreter, P. Regnier