[1] [1] Lan X, Thoning K, Dlugokencky E. Laboratory Measurements: Version, 2023, 6: 1.

[2] [2] Hall B D, Crotwell A M, Kitzis D R, et al. Atmospheric Measurement Techniques, 2021, 14(4): 3015.

[3] [3] Lenssen N J, Schmidt G A, Hansen J E, et al. Journal of Geophysical Research: Atmospheres, 2019, 124(12): 6307.

[4] [4] Tan X, Liu Y, Dong H, et al. Environmental Geochemistry and Health, 2022, 44: 2955.

[5] [5] Esler M B, Griffith D W T, Wilson S R, et al. Analytical Chemistry, 2000, 72(1): 206.

[6] [6] Smale D, Sherlock V, Griffith D T, et al. Atmospheric Measurement Techniques, 2019, 12(1): 637.

[7] [7] Liu H, Li Y, Zhang Z, et al. Optics Express, 2018, 26(18): 22837.

[8] [8] Statheropoulos M, Pappa A, Karamertzanis P, et al. Analytica Chimica Acta, 1999, 401(1-2): 35.

[9] [9] Liu T, Liu H, Chen Z, et al. IEEE Transactions on Industrial Informatics, 2018, 14(12): 5268.

[10] [10] Kistenev Y V, Skiba V, Prischepa V, et al. Journal of Quantitative Spectroscopy and Radiative Transfer, 2022, 289: 108278.

[11] [11] Griffith D W T. Applied Spectroscopy, 1996, 50(1): 59.

[12] [12] Jolliffe I T, Cadima J. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2016, 374(2065): 20150202.

[13] [13] Deborah H, Richard N, Hardeberg J Y. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(6): 3224.

[14] [14] Haney R, Siddiqui N, Andress J, et al. 41st International Conference on Environmental Systems, 2011: 5091.