Atmospheric observations suggest methane emissions in north-eastern China growing with natural gas use

Summary/Abstract

The dramatic increase of natural gas use in China, as a substitute for coal, helps to reduce CO₂ emissions and air pollution, but the climate mitigation benefit can be offset by methane leakage into the atmosphere. This study estimates methane emissions from 2010 to 2018 in four regions of China using the GOSAT satellite data and in-situ observations with a high-resolution (0.1° × 0.1°) inverse model and analyze interannual changes of emissions by source sectors. The authors find that estimated methane emission over the north-eastern China region contributes the largest part (0.77 Tg CH₄ yr⁻¹) of the methane emission growth rate of China (0.87 Tg CH₄ yr⁻¹) and is largely attributable to the growth in natural gas use. The results provide evidence of a detectable impact on atmospheric methane observations by the increasing natural gas use in China and call for methane emission reductions throughout the gas supply chain and promotion of low emission end-use facilities.