Long-term declining in carbon monoxide (CO) at a rural site of Beijing during 2006-2018 implies the improved combustion efficiency and effective emission control.
Long-term declining in carbon monoxide (CO) at a rural site of Beijing during 2006-2018 implies the improved combustion efficiency and effective emission control.
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DOI：
10.1016/j.jes.2020.11.011
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发表时间：
2020-12
影响因子：
6.9
通讯作者：
Yingruo Li;Zhiqiang Ma;Tingting Han;W. Quan;Jun-Xia Wang;Huai-gang Zhou;D. He;F. Dong
中科院分区：
文献类型：
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作者：
Yingruo Li;Zhiqiang Ma;Tingting Han;W. Quan;Jun-Xia Wang;Huai-gang Zhou;D. He;F. Dong
一氧化碳（CO）主要是不完全燃烧的结果，对大气化学循环和气候具有重要影响。改善长期二氧化碳趋势的定量表征对于大气建模以及有效控制多种污染物的政策的设计和实施都很重要。由于高时间分辨率和高质量长期观测数据的限制，对中国CO浓度长期趋势的研究相当有限。本研究利用2006-2018年北京市某农村地区CO浓度观测数据，分析了北京市CO浓度的长期趋势。采用Theil-Sen方法和基于广义加性模型（GAM）的方法进行趋势估计分析。我们发现，2006-2018年间，上甸子站点CO浓度呈显着下降趋势，每年下降22.8±5.1ppbV。 CO的下降趋势也呈现阶段性特征，2006-2008年下降速度较快，2009-2013年变化稳定，2013年以后呈持续下降趋势。污染气团来源的南向西扇区CO浓度下降趋势快于清洁气团来源扇区。 CO浓度的下降趋势意味着燃烧效率的提高以及北京及周边地区空气污染控制政策的成功。
Carbon monoxide (CO) is primarily the result of incomplete combustion, which has important impacts on the atmospheric chemical cycle and climate. Improved quantitative characterization of long-term CO trends is important for both atmospheric modeling and the design and implementation of policies to efficiently control multiple pollutants. Due to the limitations of high time-resolution and high-quality long-term observational data, studies on long-term trends in the CO concentration in China are quite limited. In this study, the observational data of the concentration of CO in a rural site of Beijing during 2006–2018 was used to analyze the long-term trend in CO concentration in Beijing. The Theil-Sen method and the generalized additive model (GAM)-based method, were used to conduct the trend estimation analysis. We found that the concentration of CO at the Shangdianzi site showed a significant downward trend during 2006–2018, with a decline rate of 22.8 ± 5.1 ppbV per year. The declining trend in CO also showed phasic characteristics, with a fast decreasing rate during the period of 2006–2008, stable variations during the period of 2009–2013 and a continuous downward trend after 2013. The declining trend in the CO concentration in the south to west (S-W) sectors where the polluted air masses come from is more rapid than that in the sectors where the clean air masses come from. The declining trend in the CO concentration implies the improved combustion efficiency and the successful air pollution control policies in Beijing and the surrounding area.