DOI: 10.1016/j.atmosenv.2017.11.001
Scopus记录号: 2-s2.0-85034067035
论文题名: Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China
作者: Tian Y ; , Sun Y ; , Liu C ; , Wang W ; , Shan C ; , Xu X ; , Hu Q
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 173 起始页码: 198
结束页码: 209
语种: 英语
英文关键词: CH4
; Fourier transform spectrometer
; GEOS-Chem
; GOSAT
; TCCON
Scopus关键词: Bolometers
; Fourier transform infrared spectroscopy
; Infrared devices
; Solar radiation
; Spectrometers
; Average difference
; Correlation coefficient
; Diurnal variability
; Diurnal variation
; Fourier transform spectrometers
; GEOS-Chem
; GOSAT
; TCCON
; Spacecraft instruments
; methane
; concentration (composition)
; diurnal variation
; EOS
; Fourier transform
; GOSAT
; methane
; near infrared
; seasonal variation
; Article
; autumn
; China
; controlled study
; Fourier transformation
; near infrared spectroscopy
; priority journal
; season
; summer
; winter
; Anhui
; China
; Hefei
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This study presents the characterization of XCH4 (averaged-column dry air mole fraction) variability and trends using the near-infrared (NIR) solar spectra recorded by the ground-based high-resolution Fourier transform spectrometer (FTS) over Hefei, China. An annual increase of 10.55 ± 2.87 ppb yr−1 (0.56 ± 0.15% yr−1) in CH4 concentrations was deduced from the three years’ worth of FTS measurements. Seasonal cycles and three typical diurnal variation modes were captured. The maximum CH4 concentration occurred in late summer or early autumn, while the minimum CH4 concentration occurred in winter. CH4 concentrations in August were 30–55 ppb higher than those in January. In most cases, the diurnal variability exhibited an increasing trend in summer or early autumn, while it exhibited a decreasing trend or remained relatively constant in other seasons. We compared the FTS data with the GOSAT data and the GEOS-Chem model data. The average difference between the GOSAT and FTS data (GOSAT minus FTS) was 1.60 ppb (0.09%) ±13.0 ppb (0.70%), and between the smoothed GEOS-Chem model data and FTS data (GEOS-Chem minus FTS) was −8.09 ppb (0.45%) ±17.83 ppb (0.95%). The differences between GOSAT and FTS were season-independent; however, obvious season-dependent differences were observed between GEOS-Chem and FTS. The GOSAT and GEOS-Chem models could reproduce the seasonal cycle observed by FTS with correlation coefficients (r) of 0.77 and 0.86, respectively. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83137
Appears in Collections: 气候变化事实与影响
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作者单位: Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China; University of Chinese Academy of Sciences, Beijing, China; Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, China
Recommended Citation:
Tian Y,, Sun Y,, Liu C,et al. Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China[J]. Atmospheric Environment,2018-01-01,173