[1] Tang Xiaoyan, Zhang Yuanhang, Shao Min. Atmospheric Environmental Chemistry [M]. Beijing: Higher Education Press, 2006. 56-67.

[2] T F Stocker, D Qin. Climate Change 2007: The Physical Science Basis [M]. Cambridge: Cambridge University Press, 2013.128-130.

[3] S A Montzka, E J Dlugokencky, J H Butler. Non-CO2 greenhouse gases and climate change [J]. Nature, 2011, 476: 43-50.

[4] P J Crutzen. The influence of nitrogen oxides on the atmospheric zone content [J]. Quarterly Journal of the Royal Meteorological Society, 1970, 96(408): 320-325.

[5] J A Logan, M J Prather, S C Wofsy, et al.. Tropospheric chemistry: A global perspective [J]. Journal of Geophysical Research, 1981, 86(c8): 7210-7254.

[6] H Fischer, F G Wienhold, P Hoor, et al.. Tracer correlations in the northern high latitude lowermost stratosphere: Influence of crosstropopause mass exchange [J]. Geophysical Research Letters, 2000, 27(1): 97-100.

[7] D D Nelson, B McManus, S Urbanski. High precision measurements of atmospheric nitrous oxide and methane using thermoelectrically cooled mid-infrared quantum cascade lasers and detectors [J]. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2004, 60(14): 3325-3335.

[8] S Wright, G Duxbury, N Langford. A compact quantum- cascade laser based spectrometer for monitoring the concentrations of methane and nitrous oxide in the troposphere [J]. Applied Physics B, 2006, 85(2-3): 243-249.

[9] J Li, U Parchatka, H Fischer. Development of field-deployable QCL sensor for simultaneous detection of ambient N2O and CO [J]. Sensors and Actuators B: Chemical, 2013, 182: 659-667.

[10] L Tao, K Sun, M A Khan. Compact and portable open-path sensor for simultaneous measurements of atmospheric N2O and CO using a quantum cascade laser [J]. Optics Express, 2012, 20(27): 28106-28118.

[11] Xia Hua, Dong Fengzhong, Tu Guojie, et al.. High sensitive detection of carbon monoxide based on novel multi-pass cell [J]. Acta Optica Sinica, 2010, 30(9): 2596-2601.

[12] Dong Lei, Ma Weiguang, Zhang Lei, et al.. Mid-IR ultra-sensitive CO detection based on pulsed quartz enhanced photoacoustic spectroscopy [J]. Acta Optica Sinica, 2014, 34(1): 0130002.

[13] Hu Yajun, Zhao Xuehong, Zhang Rui, et al.. Research on the effect of light intensity modulation on the line shape of the second harmonic in the wavelength modulation technology [J]. Acta Optica Sinica, 2013, 33(11): 1130002.

[14] J Reid, D Labrie. Second-harmonic detection with tunable diode lasers comparison of experiment and theory [J]. Applied Physics B, 1981, 26(3): 203-210.

[15] P Kluczynski, O Axner. Theoretical description based on Fourier analysis of wavelength-modulation spectrometry in terms of analytical and background signals [J]. Applied Optics, 1999, 38(27): 5803-5815.

[16] He Junfeng, Kan Ruifeng, Xu Zhenyu, et al.. Derivative spectrum and concentration inversion algorithm of tunable diode laser absorption spectroscopy oxygen measurement [J]. Acta Optica Sinica, 2014, 34(4): 0430003.

[17] I D Lindsay, P Gro, C J Lee. Mid-infrared wavelength- and frequency-modulation spectroscopy with a pump-modulated singlyresonant optical parametric oscillator [J]. Optics Express, 2006, 14(25): 12341-12346.

[18] A Farooq, J B Jeffries, R K Hanson. Sensitive detection of temperature behind reflected shock waves using wavelength modulation spectroscopy of CO2 near 2.7 mm [J]. Applied Physics B, 2009, 96(1): 161-173.

[19] G S Engel, E J Moyer. Precise multipass Herriott cell design: Derivation of controlling design equations [J]. Optics Letters, 2007, 32(6): 704-706.