Enhancement of farmland greenhouse gas emissions from leakage of stored CO2: simulation of leaked CO2 from CCS.
The effects of leaked CO2 on plant and soil constitute a key objective of carbon capture and storage (CCS) safety. The effects of leaked CO2 on trace soil gas (e.g., methane (CH4) and nitrous oxide (N2O) emissions in farmlands are not well-understood. This study simulated the effects of elevated soil CO2 on CH4 and N2O through pot experiments. The results revealed that significant increases of CH4 and N2O emissions were induced by the simulated CO2 leakages; the emission rates of CH4 and N2O were substantial, reaching about 222 and 48 times than that of the control, respectively. The absolute global warming potentials (GWPs) of the additional CH4 and N2O are considerable, but the cumulative GWPs of the additional CH4 and N2O only accounted for 0.03% and 0.06%, respectively, of the cumulative amount of leaked CO2 under high leakage conditions. The results demonstrate that leakage from CCS projects may lead to additional greenhouse gas emissions from soil; however, in general, the amount of additional CH4 and N2O emissions is negligible when compared with the amount of leaked CO2.
Chinese Academy of Meteorological Sciences, Beijing 100-081, China.
Xueyan
X
Zhang
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Laboratory of Agricultural Environment and Climate Change, Ministry of Agriculture, Beijing 100-081, China. Electronic address: max@ami.ac.cn.
Xin
X
Ma
Engineering Consulting Centre, China Meteorological Administration, Beijing 100-081, China.
Yang
Y
Wu
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Laboratory of Agricultural Environment and Climate Change, Ministry of Agriculture, Beijing 100-081, China.
Yue
Y
Li
CCS; CH(4); GHG emission; Global warming potential; Leaked CO(2); N(2)O