On Using Tunable Diode Laser Absorption Spectroscopy to Determine Gas Fluxes over Cropland
TIAN Yong-zhi1,2, LIU Jian-guo1*, ZHANG Yu-jun1, LU Yi-huai1, HE Ying1
1. Key Lab of Environment Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：Tunable diode laser absorption spectroscopy (TDLAS) is a compact, automated, high precision technique and fit for in-situ or field measurements. Two spectroscopy measurement systems, TDLAS and NDIR (non-dispersive infrared spectroscopy), were used to monitor trace gas emission over cropland at Fengqiu Agricultural Ecology Experimental Station for one month. The fluxes of carbon dioxide were estimated by flux-gradient and eddy covariance method, respectively. A footprint model was developed during experiment. Based on this model, the source areas of TDLAS and NDIR were investigated. The effects of different factors on the flux measurement were also analyzed. The authors concluded that the source areas for the two techniques are discrepant in most of the cases. The source areas increase with path length and detecting height. This result will help the installation of instruments.
Key words：Tunable diode lases absorption spectroscopy;Trace gas fluxes;Flux footprint
田勇志1,2，刘建国1*，张玉钧1，陆亦怀1，何 莹1 . 可调谐半导体激光吸收光谱监测农田气体通量特性研究[J]. 光谱学与光谱分析, 2012, 32(04): 1072-1076.
TIAN Yong-zhi1,2, LIU Jian-guo1*, ZHANG Yu-jun1, LU Yi-huai1, HE Ying1 . On Using Tunable Diode Laser Absorption Spectroscopy to Determine Gas Fluxes over Cropland . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(04): 1072-1076.
[1] Fowler D, Coyle M, Flechard C, et al. Plant and Soil, 2001, 228: 117. [2] WANG Geng-chen(王庚辰). Climatic and Environmental Research(气候与环境研究)，1997, 2(3): 251. [3] Werle P. Spectrochimica Acta A, 1998, 54: 197. [4] Philippe Louis C, Hanson R K. Appl. Opt., 1993, 32: 6090. [5] Zhou X，Jefries J B. Appl. Phys. B，2005，81: 711. [6] Amato F D. Mazzing H P, Castagnoli F. Appl. Phys. B，2002, 75: 195. [7] Miller J H. Elreedy S，Ahvazi B, et al. Appl. Opt., 1993, 32: 6082. [8] Reid J, Labric D. Appl. Phys. B, 1981, 26(2): 203. [9] KAN Rui-feng, LIU Wen-qing, ZHANG Yu-jun, et al(阚瑞峰，刘文清，张玉钧，等). Acta Optica Sinica(光学学报), 2006, 26(1): 68. [10] Lee X, Massman W J, Law B. Handbook of Micrometeorology: A Guide for Surface Flux Measurement and Analysis. Kluwer: Dordrecht, 2004. 250. [11] Pattey E, Strachan I B, Desjardins R L, et al. Agricultural and Forest Meteorology, 2006, 136: 222. [12] Kormann R，Mexiner F X. Bound. -Layer Meteorology, 2001, 99: 207. [13] PENG Gu-liang, CAI Xu-hui, LIU Shao-min(鹏谷亮, 蔡旭辉, 刘绍民). Acta Scientiarum Naturalium Universitatis Pekinensis(北京大学学报·自然科学版), 2007, 43(6): 822.
