The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China

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, Youwen 1,2; Yin, Hao 1,2; Liu, Cheng 1,2,3; Mahieu, Emmanuel 4; Notholt, Justus 5; Te, Yao 6; Lu, Xiao 7; Palm, Mathias 5; Wang, Wei 1; Shan, Changgong 1
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2021-08-06
卷号	21
ISSN号	1680-7316
DOI	10.5194/acp-21-11759-2021
通讯作者	Yin, Hao(yhyh95@mail.ustc.edu.cn) ; Liu, Cheng(chliu81@ustc.edu.cn)
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 groundbased high-resolution Fourier transform infrared (FTIR) remote sensing along with atmospheric modeling techniques. We obtained a retrieval error of 6.21 +/- 1.2 (1 sigma)% and degrees of freedom (DOFS) of 1.47 +/- 0.2 (1 sigma) in the retrieval of C2H6 tropospheric column-averaged dry-air mole fraction (troDMF) over Hefei, eastern China (32 degrees N, 117 degrees E; 30 m a.s.l.). The observed C2H6 troDMF reached a minimum monthly mean value of 0.36 +/- 0.26 ppbv in July and a maximum monthly mean value of 1.76 +/- 0.35 ppbv in December, and showed a negative change rate of 2.60 +/- 1.34% 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 48.1% and 39.7% of C2H6 troDMF variability over Hefei, respectively. The observed C2H6 troDMF variability mainly results from the emissions within China (74.1 %), where central, eastern, and northern China dominated the contribution (57.6 %). 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.
资助项目	National Key Research and Development Program of China[2019YFC0214802] ; National Key Research and Development Program of China[2017YFC0210002] ; National Key Research and Development Program of China[2016YFC0203302] ; National Key Research and Development Program of China[2018YFC0213201] ; National Key Research and Development Program of China[2019YFC0214702] ; National Key Research and Development Program of China[2016YFC0200404] ; National Science Foundation of China[41775025] ; National Science Foundation of China[41575021] ; National Science Foundation of China[51778596] ; National Science Foundation of China[91544212] ; National Science Foundation of China[41722501] ; Sino-German Mobility Programme[M-0036] ; F.R.S.-FNRS[J.0147.18]
WOS关键词	VOLATILE ORGANIC-COMPOUNDS ; GLOBAL ATMOSPHERIC ETHANE ; SURFACE OZONE POLLUTION ; FTIR TIME-SERIES ; GEOS-CHEM ; ANTHROPOGENIC EMISSIONS ; MODEL SIMULATIONS ; METHANE EMISSIONS ; DRY DEPOSITION ; SOLAR SPECTRA
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000683773600005
资助机构	National Key Research and Development Program of China ; National Science Foundation of China ; Sino-German Mobility Programme ; F.R.S.-FNRS
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123102]
专题	中国科学院合肥物质科学研究院
通讯作者	Yin, Hao; Liu, Cheng
作者单位	1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, HFIPS, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Key Lab Precis Sci Instrumentat Anhui Higher Educ, Hefei 230026, Peoples R China 3.USTC, Anhui Prov Key Lab Polar Environm & Global Change, Hefei 230026, Peoples R China 4.Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium 5.Univ Bremen, Inst Environm Phys, D-28334 Bremen, Germany 6.Sorbonne Univ, PSL Univ, Observ Paris,CNRS, Lab Etud Rayonnement & Matiere Astrophys & Atmosp, F-75005 Paris, France 7.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai 519082, Peoples R China 8.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China 9.Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Sun, Youwen,Yin, Hao,Liu, Cheng,et al. The reduction in C2H6 from 2015 to 2020 over Hefei, eastern China, points to air quality improvement in China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2021,21.
APA	Sun, Youwen.,Yin, Hao.,Liu, Cheng.,Mahieu, Emmanuel.,Notholt, Justus.,...&Zheng, Bo.(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.
MLA	Sun, Youwen,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(2021).