A comparative study of anthropogenic CH 4 emissions over China based on the ensembles of bottom-up inventories
2021
Abstract. Atmospheric methane (CH 4 ) is a potent greenhouse gas that is strongly
influenced by several human activities. China, as one of the major
agricultural and energy production countries, contributes considerably to
the global anthropogenic CH 4 emissions by rice cultivation, ruminant
feeding, and coal production. Understanding the characteristics of China's
CH 4 emissions is necessary for interpreting source contributions and
for further climate change mitigation. However, the scarcity of data from
some sources or years and spatially explicit information pose great
challenges to completing an analysis of CH 4 emissions. This study
provides a comprehensive comparison of China's anthropogenic CH 4
emissions by synthesizing the most current and publicly available
datasets (13 inventories). The results show that anthropogenic CH 4
emissions differ widely among inventories, with values ranging from
44.4–57.5 Tg CH 4 yr −1 in 2010. The discrepancy primarily resulted
from the energy sector (27.3 %–60.0 % of total emissions), followed by the
agricultural (26.9 %–50.8 %) and waste treatment (8.1 %–21.2 %) sectors.
Temporally, emissions among inventories stabilized in the 1990s but
increased significantly thereafter, with annual average growth rates (AAGRs)
of 2.6 %–4.0 % during 2000–2010 but slower AAGRs of 0.5 %–2.2 % during
2011–2015, and the emissions became relatively stable, with AAGRs of
0.3 %–0.8 %, during 2015–2019 because of the stable emissions from the energy
sector (mainly coal production). Spatially, there are large differences in
emissions hotspot identification among inventories, and incomplete
information on emission patterns may mislead or bias mitigation efforts for
CH 4 emission reductions. The availability of detailed activity data for
sectors or subsectors and the use of region-specific emission factors play
important roles in understanding source contributions and reducing the
uncertainty in bottom-up inventories. Data used in this article are
available at https://doi.org/10.6084/m9.figshare.12720989 (Lin
et al., 2021).
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