Ground-based high-resolution remote sensing of sulphur hexafluoride (SF6) over Hefei, China: characterization, optical misalignment, influence, and variability

doi:10.1364/OE.440193

	Ground-based high-resolution remote sensing of sulphur hexafluoride (SF6) over Hefei, China: characterization, optical misalignment, influence, and variability
	Yin, Hao 1,2; Sun, Youwen 1; Wang, Wei 1; Shan, Changgong 1; Tian, Yuan 3; Liu, Cheng 1,2,4
刊名	OPTICS EXPRESS
	2021-10-11
卷号	29
ISSN号	1094-4087
DOI	10.1364/OE.440193
通讯作者	Sun, Youwen(ywsun@aiofm.ac.cn)
英文摘要	It is a challenge to retrieve atmospheric sulphur hexafluoride (SF6) with high resolution solar spectra because it has only one single retrieval micro window and has interfered with many factors in the retrieval. Optical misalignment is one of the key factors that affect the accuracy of SF6 retrieval. In this study, we first present a long term time series of the SF6 total column over Hefei, China, between January 2017 and December 2020, retrieved by mid-infrared (MIR) solar spectra recorded by ground-based high-resolution Fourier transform infrared spectroscopy (FTIR). The sensitivities of the total column, root mean square of fitting residual (RMS), total error budgets, degrees of freedom for signal (DOFs), and vertical mixing ratio (VMR) profile with respect to different levels of optical misalignment for SF6 retrieval were assessed. The SF6 total column is sensitive to optical misalignment. In order to avoid inconsistencies in the total column due to optical misalignment, we use the true instrumental line shape (ILS) derived from regular low-pressure HBr cell measurements to retrieve the time series of SF6. The total column of SF6 over Hefei presents strong seasonal dependent features. The maximum monthly average value of (3.57 +/- 0.21) x 10(14) moleculescm(-2) in summer is (7.60 +/- 3.50) x 10(13) moleculescm(-2) (21.29 +/- 9.80)% higher than the minimum monthly average value of (2.81 +/- 0.14) x 10(14) moleculescm(-2) in winter. The annual average SF6 total columns in 2017-2020 are (3.02 +/- 0.17), (3.50 +/- 0.18), (3.25 +/- 0.18), and (3.08 +/- 0.16) x 10(14) moleculescm(-2), respectively, which are close to each other. It indicates that SF6 total column over Hefei is stable in the past four years. Our study can improve the current understanding for ground-based high-resolution remote sensing of SF6 and also contribute to generate new reliable remote sensing data in this sparsely monitored region for investigations of climate change, global warming, and air pollution. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
资助项目	Youth Innovation Promotion Association[2019434] ; Sino-German Mobility programme[M-0036]
WOS关键词	INSTRUMENTAL LINE-SHAPE ; EASTERN CHINA ; ATMOSPHERIC SF6 ; TIME-SERIES ; SPECTROMETERS ; AIR ; RETRIEVALS ; TRANSPORT ; LIFETIME ; NETWORK
WOS研究方向	Optics
语种	英语
出版者	OPTICAL SOC AMER
WOS记录号	WOS:000708940500106
资助机构	Youth Innovation Promotion Association ; Sino-German Mobility programme
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125575]
专题	中国科学院合肥物质科学研究院
通讯作者	Sun, Youwen
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, Hefei 230026, Peoples R China 3.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361021, Peoples R China
推荐引用方式 GB/T 7714	Yin, Hao,Sun, Youwen,Wang, Wei,et al. Ground-based high-resolution remote sensing of sulphur hexafluoride (SF6) over Hefei, China: characterization, optical misalignment, influence, and variability[J]. OPTICS EXPRESS,2021,29.
APA	Yin, Hao,Sun, Youwen,Wang, Wei,Shan, Changgong,Tian, Yuan,&Liu, Cheng.(2021).Ground-based high-resolution remote sensing of sulphur hexafluoride (SF6) over Hefei, China: characterization, optical misalignment, influence, and variability.OPTICS EXPRESS,29.
MLA	Yin, Hao,et al."Ground-based high-resolution remote sensing of sulphur hexafluoride (SF6) over Hefei, China: characterization, optical misalignment, influence, and variability".OPTICS EXPRESS 29(2021).