【摘要】 甲烷是一种重要的温室气体,它对大气中温室效应的贡献仅次于二氧化碳。针对环境空气中甲烷的测定,从测量原理、测量过程和测量装置等方面比较了可调谐二极管激光吸收光谱和气相色谱法两种测量方法。结果表明用上述两种方法测得的甲烷的日变化趋势具有良好的一致性。相比较而言,后者造价更低,并且更方便。更多还原

【Abstract】 Methane is the second important greenhouse gas,after carbon dioxide.Its concentration is of particular importance for radiative process and climate trends.Two measurement techniques are compared in the study.One is the tunable diode laser absorption spectroscopy and the other is Gas Chromatograph.The principles,measuring process and experiment system are described.Results show that the daily variation trend of CH4 derived from the two techniques are in good agreement and also indicated that the technique of tunable diode laser absorption spectroscopy is cheaper in cost and more convenient.更多还原