title: A new high-resolution N2O emission inventory for China in 2008.
abstract: The amount and geographic distribution of N2O emissions over China remain largely uncertain. In this study, county-level and 0.1° × 0.1° gridded anthropogenic N2O emission inventories for China (PKU-N2O) in 2008 are developed based on high-resolution activity data and regional emission factors (EFs) and parameters. These new estimates are compared with previous inventories, and with two sensitivity tests: one that uses high-resolution activity data but the default IPCC methodology (S1) and the other that uses regional EFs and parameters but starts from coarser-resolution activity data. The total N2O emissions are 2150 GgN2O/yr (interquartile range from 1174 to 2787 GgN2O/yr). Agriculture contributes 64% of the total, followed by energy (17%), indirect emissions (12%), wastes (5%), industry (2.8%), and wildfires (0.2%). Our national emission total is 17% greater than that of the EDGAR v4.2 global product sampled over China and is also greater than the GAINS-China, NDRC, and S1 estimates by 10%, 50%, and 17%, respectively. We also found that using uniform EFs and parameters or starting from national/provincial data causes systematic spatial biases compared to PKU-N2O. Spatial analysis shows nonlinear relationships between N2O emission intensities and urbanization. Per-capita and per-GDP N2O emissions increase gradually with an increase in the urban population fraction from 0.3 to 0.9 among 2884 counties, and N2O emission density increases with urban expansion.
authors: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University (PKU) , Beijing, 100871, P.R. China.
authors: Feng
authors: F
authors: Zhou
authors: Ziyin
authors: Z
authors: Shang
authors: Philippe
authors: P
authors: Ciais
authors: Shu
authors: S
authors: Tao
authors: Shilong
authors: S
authors: Piao
authors: Peter
authors: P
authors: Raymond
authors: Canfei
authors: C
authors: He
authors: Bengang
authors: B
authors: Li
authors: Rong
authors: R
authors: Wang
authors: Xuhui
authors: X
authors: Wang
authors: Shushi
authors: S
authors: Peng
authors: Zhenzhong
authors: Z
authors: Zeng
authors: Han
authors: H
authors: Chen
authors: Na
authors: N
authors: Ying
authors: Xikang
authors: X
authors: Hou
authors: Peng
authors: P
authors: Xu
mesh_terms: D000383:Agriculture; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D009609:Nitrous Oxide / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D009609:Nitrous Oxide