Jia Mengwei, Jiang Fei, Evangeliou Nikolaos, Eckhardt Sabine, Huang Xin, Ding Aijun, Stohl Andreas
Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing, 210023, China.
Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.
J Environ Manage. 2023 Jul 1;337:117735. doi: 10.1016/j.jenvman.2023.117735. Epub 2023 Mar 15.
The Fenwei Plain is one of China's most polluted regions, with poor atmospheric dispersion conditions and an outdated energy structure. After implementing multiple policies in recent years, significant reductions in air pollutant concentrations were observed. In this study, based on the Lagrangian-Bayesian inversion framework FLEXINVERT, we constructed a variable resolution inversion system focusing on the Fenwei Plain and inferred the carbon monoxide (CO) emissions using in-situ atmospheric CO observations from April 2014 to March 2020. We analyzed the spatiotemporal variations of the CO emissions and discussed their causes, especially the effect of the "Three-year Action Plan on Defending the Blue Sky" (TAPDBS). Before the policy, CO emissions temporarily increased, and the overall decrease in CO emissions per unit of Gross Domestic Product (GDP) slowed down. When the policy was implemented, CO emission fluxes declined sharply, with an average drop of 28%, accompanied by an even higher 37% decrease of CO emission per GDP. The reasons for the decline in CO emissions in Shanxi, Shaanxi and Henan are diverse. The decrease in energy intensity is the reason for CO emission reduction in Shannxi and Henan province but not in Shanxi province. This research fills the gap in emission information in recent years and confirms that TAPDBS has brought a breakthrough in both economic development and air quality protection in the Fenwei Plain.
汾渭平原是中国污染最严重的地区之一，大气扩散条件差，能源结构陈旧。近年来实施多项政策后，空气污染物浓度显著下降。在本研究中，基于拉格朗日 - 贝叶斯反演框架FLEXINVERT，我们构建了一个聚焦汾渭平原的可变分辨率反演系统，并利用2014年4月至2020年3月的现场大气一氧化碳（CO）观测数据推断CO排放量。我们分析了CO排放的时空变化并讨论了其成因，特别是《打赢蓝天保卫战三年行动计划》（TAPDBS）的影响。在该政策实施前，CO排放量暂时增加，单位国内生产总值（GDP）的CO排放总量下降速度放缓。当该政策实施时，CO排放通量急剧下降，平均降幅为28%，单位GDP的CO排放量降幅甚至更高，达37%。山西、陕西和河南CO排放量下降的原因各不相同。能源强度下降是陕西和河南两省CO减排的原因，但不是山西省CO减排的原因。本研究填补了近年来排放信息的空白，并证实TAPDBS在汾渭平原的经济发展和空气质量保护方面都带来了突破。
