摘要
利用可调谐半导体激光吸收光谱(TDLAS)对环境空气中的甲烷进行了测量。选择不受干扰的1.65μm处的吸收线对甲烷进行浓度监测。在2005年秋季对北京城区的甲烷气体以1min的时间分辨率进行了近1个月的连续监测。甲烷的浓度在19:00左右开始上升,在凌晨01:00左右开始下降,具有明显的周期性。浓度最低值出现在白天,而最大值出现在夜里,给出了甲烷的日变化和连续监测结果。
Ambient methane was measured by tunable diode laser absorption spectroscopy (TDLAS). The absorption line of methane at 1.65 μm was found to be free of interference and suitable for ambient methane measurements. Methane was continuously measured for nearly 270 hours with one minute temporal resolution at an urban site in Beijing during the autumn of 2005. The concentration of methane increased after 19:00 and fell after 01:00 at night. The variation of CH4 concentration has an obvious periodicity. The lowest concentration obtained in the daytime while the highest at night. The diurnal variations of atmospheric CH4 and continue monitoring results were presented.
出处
《大气与环境光学学报》
CAS
2007年第3期203-206,共4页
Journal of Atmospheric and Environmental Optics
基金
中科院知识创新重要方向项目(KJCX2-SW-H27)
国家自然科学基金重点项目(50534050)