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  

作　　者：Yingruo Li Zhiqiang Ma Tingting Han Weijun Quan Junxia Wang Huaigang Zhou Di He Fan Dong 

机构地区：[1]Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089,China [2]Key Laboratory of Atmospheric Chemistry,China Meteorological Administration,Beijing 100081,China [3]Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei,China Meteorological Administration,Beijing 100089,China [4]College of Environmental Science and Engineering,Peking University,Beijing 100871,China

出　　处：《Journal of Environmental Sciences》2022年第5期432-442,共11页环境科学学报（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(No.41905119);the National Key R&D Program of China(No.2017YFC0209803);the Key Laboratory of Atmospheric Chemistry,China Meteorological Administration,LAC/CMA(No.2019B03);the Beijing Meteorological Service,BMB(No.BMBKJ201901005).

摘　　要：Carbon monoxide(CO)is primarily the result of incomplete combustion,which has impor-tant impacts on the atmospheric chemical cycle and climate.Improved quantitative char-acterization 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.

关 键 词：Carbon monoxide Long-term trend Theil-Sen method Generalized additive model (GAM)-based method Stratified analysis 

分 类 号：X51[环境科学与工程—环境工程]