Zhang Xu, Yao Bo, Wu Jing, Yi Liying, Jiang Pengnan, Bai Fuli, Chen Ziwei, Zhao Xingchen, O'Doherty Simon, Xu Weiguang, Hu Jianxin
State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China; Meteorological Observation Centre of China Meteorological Administration (MOC/CMA), Beijing 100081, China.
Sci Total Environ. 2024 Nov 15;951:175575. doi: 10.1016/j.scitotenv.2024.175575. Epub 2024 Aug 15.
HFC-125 and HFC-32 are fluorinated greenhouse gases of great concern due to their high GWPs and increasing background atmospheric concentrations. Long-term atmospheric observations of HFC-125 and HFC-32 were carried out in four representative cities of China (Beijing, Guangzhou, Hangzhou, and Lanzhou) from January 2012 to October 2019. Overall, the annual mean atmospheric concentrations of HFC-125 and HFC-32 both showed increasing trends, with average rates of 4.8 ppt yr and 7.9 ppt yr. The average concentrations of HFC-125 and HFC-32 in urban areas were significantly higher than those in suburban areas. Significant differences in atmospheric concentrations of the two HFCs were observed among the four cities. HFC-125 and HFC-32 emissions were estimated accordingly, averaging 6.2 Gg yr (23.6 Mt. CO-eq) and 5.7 Gg yr (4.3 Mt. CO-eq) during 2012 and 2019 and growing at rates of 0.8 Gg yr (3.1 Mt. CO-eq) and 0.8 Gg yr (0.6 Mt. CO-eq), respectively, with an increasing contribution to global radiative forcing. The bottom-up inventories of HFC-125 and HFC-32 in the four cities increased annually from 2012 to 2019, with the highest emissions in Beijing, while the top-down emissions fluctuated during the research period. SYNOPSIS: The atmospheric concentrations of HFC-125 and HFC-32 were measured from 2012 to 2019 in four representative cities of China. Both HFC emissions at national and city levels were estimated using observation-based and inventory methods.
HFC - 125和HFC - 32是备受关注的氟化温室气体，因为它们具有很高的全球变暖潜能值（GWPs）且大气背景浓度不断增加。2012年1月至2019年10月期间，在中国四个具有代表性的城市（北京、广州、杭州和兰州）开展了对HFC - 125和HFC - 32的长期大气观测。总体而言，HFC - 125和HFC - 32的年平均大气浓度均呈上升趋势，平均增长率分别为4.8 ppt/年和7.9 ppt/年。城市地区HFC - 125和HFC - 32的平均浓度显著高于郊区。在这四个城市中，观测到这两种HFC的大气浓度存在显著差异。据此估算了HFC - 125和HFC - 32的排放量，在2012年至2019年期间平均分别为6.2 Gg/年（23.6 Mt CO₂ - eq）和5.7 Gg/年（4.3 Mt CO₂ - eq），且分别以0.8 Gg/年（3.1 Mt CO₂ - eq）和0.8 Gg/年（0.6 Mt CO₂ - eq）的速率增长，对全球辐射强迫的贡献不断增加。从2012年到2019年，四个城市HFC -
