Multi-Isotopic Analysis Refines Global Methane Emission Estimates

A recent international study, published in the Journal of Geophysical Research: Atmospheres, has refined the accuracy of global methane emission estimates using advanced multi-isotopic atmospheric measurements. Led by Dr. Ryo Fujita from Imperial College London and the Japanese Meteorological Research Institute, the research integrates radiocarbon and stable isotopes of carbon and hydrogen to distinguish between methane sources. The study found that global fossil methane emissions are approximately 130 teragrams per year for 2003-2012, aligning with Global Carbon Project estimates. This clarifies earlier conflicting assessments. Dr. Andrew Smith from ANSTO emphasized the importance of multi-isotopic measurements for reducing uncertainties in methane emission inventories, crucial for effective climate policy. The research involved collaboration with institutions in Italy, the US, and Japan, highlighting the need for international cooperation in tracking greenhouse gas emissions. ANSTO's Centre for Accelerator Science played a pivotal role in radiocarbon measurements.