气候变化领域集成服务门户(CCPortal): The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China

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DOI	10.5194/acp-21-11759-2021
	The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China
	Sun Y.; Yin H.; Liu C.; Mahieu E.; Notholt J.; Té Y.; Lu X.; Palm M.; Wang W.; Shan C.; Hu Q.; Qin M.; Tian Y.; Zheng B.
发表日期	2021
ISSN	1680-7316
起始页码	11759
结束页码	11779
卷号	21 期号:15
英文摘要	Ethane (C2H6) is an important greenhouse gas and plays a significant role in tropospheric chemistry and climate change. This study first presents and then quantifies the variability, sources, and transport of C2H6 over densely populated and highly industrialized eastern China using ground-based high-resolution Fourier transform infrared (FTIR) remote sensing along with atmospheric modeling techniques. We obtained a retrieval error of 6.21g ±g 1.2 (1σ)% and degrees of freedom (DOFS) of 1.47g ±g 0.2 (1σ) in the retrieval of C2H6 tropospheric column-averaged dry-air mole fraction (troDMF) over Hefei, eastern China (32g g N, 117g g E; 30g ma.s.l.). The observed C2H6 troDMF reached a minimum monthly mean value of 0.36g ±g 0.26g ppbv in July and a maximum monthly mean value of 1.76g ±g 0.35g ppbv in December, and showed a negative change rate of -2.60g ±g 1.34g %yr-1 from 2015 to 2020. The dependencies of C2H6 troDMF on meteorological and emission factors were analyzed using generalized additive models (GAMs). Generally, both meteorological and emission factors have positive influences on C2H6 troDMF in the cold season (December-January-February/March-April-May, DJF/MAM) and negative influences on C2H6 troDMF in the warm season (June-July-August/September-October-November, JJA/SON). GEOS-Chem chemical model simulation captured the observed C2H6 troDMF variability and was, thus, used for source attribution. GEOS-Chem model sensitivity simulations concluded that the anthropogenic emissions (fossil fuel plus biofuel emissions) and the natural emissions (biomass burning plus biogenic emissions) accounted for 48.1g % and 39.7g % of C2H6 troDMF variability over Hefei, respectively. The observed C2H6 troDMF variability mainly results from the emissions within China (74.1g %), where central, eastern, and northern China dominated the contribution (57.6g %). Seasonal variability in C2H6 transport inflow and outflow over the observation site is largely related to the midlatitude westerlies and the Asian monsoon system. Reduction in C2H6 abundance from 2015 to 2020 mainly results from the decrease in local and transported C2H6 emissions, which points to air quality improvement in China in recent years. © Author(s) 2021.
语种	英语
scopus关键词	air quality; atmospheric chemistry; concentration (composition); ethane; greenhouse gas; troposphere; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246677
作者单位	Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei, 230026, China; Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, 230026, China; Institute of Astrophysics and Geophysics, University of Liège, Liège, 4000, Belgium; Institute of Environmental Physics, University of Bremen, Bremen, 28334, Germany; Laboratoire d'Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères, Sorbonne Université, CNRS, Observatoire de Paris, PSL Université, Paris, 75005, France; School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, 519082, China; Institute of Physical Science and Information Technology, Anhui University, Hefei, 230601, China; Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate Scho...
推荐引用方式 GB/T 7714	Sun Y.,Yin H.,Liu C.,et al. The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China[J],2021,21(15).
APA	Sun Y..,Yin H..,Liu C..,Mahieu E..,Notholt J..,...&Zheng B..(2021).The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Sun Y.,et al."The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).