[1] [1] Wada R, Pearce J K, Nakayama T, et al. Atmospheric Environment, 2011, 45(5): 1168.

[2] [2] Twining J, Stone D, Tadros C, et al. Global and Planetary Change, 2006, 51(1-2): 59.

[3] [3] Griffith D W T, Jamie I, Esler M, et al. Isotopes in Environmental and Health Studies, 2006, 42(1): 9.

[4] [4] Cappa C D, Hendricks M B, DePaolo D J, et al. Journal of Geophysical Research, 2003, 108 (D16): 4525.

[6] [6] Jager F, Wagner G, Meijer H A J, et al. Isotopes in Environmental and Health Studies, 2005, 41(4): 373.

[7] [7] Wen X F, Sun X M, Zhang S C, et al. Journal of Hydrology, 2008, 349(3-4): 489.

[8] [8] Schaeffer S M, Miller J B, Vaughn B H, et al. Atmospheric Chemistry and Physics, 2008, 8(17): 5263.

[10] [10] McManus J B, Nelson D D, Zahniser M S. Isotopes in Environmental and Health Studies, 2010, 46(1): 49.

[11] [11] Tuzson B, Zeeman M J, Zahniser M S, et al. Infrared Physics and Technology, 2008, 51(3): 198.

[12] [12] Gupta P, Noone D, Galewsky J, et al. Rapid Communications in Mass Spectrometry, 2009, 23(16): 2534.

[13] [13] Kerstel E R T, Iannone R Q, Chenevier M, et al. Applied Physics B-Lasers and Optics, 2006, 85(2-3): 397.

[14] [14] Esler M B, Griffith D W T, Wilson S R, et al. Analytical Chemistry, 2000, 72(1): 216.

[15] [15] Griffith D W T. Applied Spectroscopy, 1996, 50(1): 59.

[16] [16] Esler M B, Griffith D W T, Wilson S R, et al. Analytical Chemistry, 2000, 72(1): 206.

[17] [17] Schneider M, Toon G C, Blavier J F, et al. Atmospheric Measurement Techniques, 2010, 3(6): 1599.

[18] [18] Keeling C D. Geochimica et Cosmochimica Acta, 1958, 13(4): 322.

[19] [19] Keeling C D. Geochimica et Cosmochimica Acta, 1961, 24(3-4): 277.

[20] [20] Pataki D E, Ehleringer J R, Flanagan L B, et al. Global Biogeochemical Cycles, 2003, 17(1): 1022.

[21] [21] Yakir D, Sternberg L D L. Oecologia, 2000, 123(3): 297.

[22] [22] Bowling D R, Sargent S D, Tanner B D, et al. Agricultural and Forest Meteorology, 2003, 118(1-2): 1.

[23] [23] Griffis T J, Zhang J, Baker J M, et al. Boundary-Layer Meteorology, 2007, 123(2): 295.

[24] [24] Roden J S, Ehleringer J R. Plant Physiology, 1999, 120(4): 1165.