[1] BRANDT A R, HEATH G A, COOLEY D. Methane leaks from natural gas systems follow extreme distributions［J］. Environmental Science & Technology, 2016, 50: 12512-12520.

[2] BAMBERGER I, STIEGER J, BUCHMANN N, et al.. Spatial variability of methane: Attributing atmospheric concentrations to emissions［J］. Environmental Pollution, 2014, 190: 65-74.

[3] SMITH F A, ELLIOTT S, BLAKE D R, et al.. Spatiotemporal variation of methane and other trace hydrocarbon concentrations in the Valley of Mexico［J］. Environmental Science & Policy, 2002, 5(6): 449-461.

[4] SIMPSON I J, ROWLAND F S, MEINARDI S, et al.. Influence of biomass burning during recent fluctuations in the slow growth of global tropospheric methane［J］. Geophysical Research Letters, 2006, 33(22): L22808.

[5] XIAO Y, LONGAN J A, JACOB D J, et al.. Global budget of ethane and regional constraints on U.S. sources［J］. Journal of Geophysical Research-Atmospheres, 2008, 113(D21): D21306.

[6] ETIOPE G, CICCIOOO P. Earth's degassing: a missing ethane and propane source ［J］. Science, 2009, 323(5913): 478.

[7] SIMPSON I, ANDERSEN M, MEINARDI S, et al.. Long-term decline of global atmospheric ethane concentrations and implications for methane ［J］. Nature, 2012, 488(7412): 490-494.

[8] NICEWONGER M, VEERHULAST K, AYDIN M, et al.. Preindustrial atmospheric ethane levels inferred from polar ice cores: a constraint on the geologic sources of atmospheric ethane and methane ［J］. Geophysical Research Letters, 2016, 43(1): 214-221.

[9] TASSI F, VENTURI S, CABASSI J, et al.. Volatile organic compounds (VOCs) in soil gases from Solfatara crater (Campi Flegrei, southern Italy): Geogenic source(s) vs. biogeochemical processes ［J］. Applied Geochemistry, 2015, 56: 37-49.

[10] DONG L, TITTEL F K, LI C, et al.. Compact TDLAS based sensor design using interband cascade lasers for mid-IR trace gas sensing ［J］. Optics Express, 2016, 24: A528-A535.

[11] 李相贤,徐亮,高闽光,等.分析温室气体及CO2碳同位素比值的傅里叶变换红外光谱仪［J］.光学 精密工程, 2014, 22(9): 2359-2368.

    LI X X, XU L, GAO M G, et al.. Fourier transform infrared spectrometer for analyzing greenhouse gas and CO2 carbon isotope ratio［J］. Opt. Precision Eng., 2014, 22(9): 2359-2368.(in Chinese)

[12] 王智宏,张福东,滕飞,等.基于近红外波长组合快速检测油页岩含油率［J］.光学 精密工程,2015,23(2): 371-377.

    WANG ZH H, ZHANG F D, TENG F, et al.. Fast detection of oil content in oil shale based on near infrared wavelength combination［J］. Opt. Precision Eng., 2015,23(2): 371-377. (in Chinese)

[13] DONG M, ZHENG C, MIAO S, et al.. Development and measurements of a mid-infrared multi-gas sensor system for CO, CO2 and CH4 detection［J］. Sensors, 2017, 17(10): 2221.

[14] LIU K, MEI J, ZHANG W, et al.. Multi-resonator photoacoustic spectroscopy［J］. Sensors and Actuators B: Chemical, 2017, 251: 632-636.

[15] DONG L, LI C, SANCHEZ N P, et al.. Compact CH4 sensor system based on a continuous-wave, low power consumption, room temperature interband cascade laser［J］. Applied Physics Letters, 2016, 108: 011106.

[16] MA Y, HE Y, ZHANG Y, et al.. Ultra-high sensitive acetylene detection using quartz-enhanced photoacoustic spectroscopy with a fiber-amplified diode laser and a 30.72 kHz quartz tuning fork［J］. Applied Physics Letters,2017, 110: 121104.

[17] SANCHEZ N P, ZHENG C, YE W, et al.. Exploratory study of atmospheric methane enhancements derived from natural gas use in the Houston urban area［J］. Atmospheric Environment, 2018, 176: 261-273.