大气CO_2 15μm吸收带对温度依赖关系的研究

Study on the Temperature Dependence of CO_2 15Absorption Band

利用最新版本的大气分子吸收光谱资料HITRAN2004,以CO215μm吸收带为例,通过精确的逐线积分模式,详细讨论了温度对谱线半宽度、线强以及吸收系数的影响。结果发现:吸收系数对温度的依赖关系主要受线强对温度依赖关系的影响,受半宽度对温度依赖关系的影响较小;在吸收带的中心区域,温度对线强和吸收系数的影响较弱,而在带翼影响较强。

Using HITRAN 2004, the updated molecular spectroscopic database, and an exact lineby-line integration, we take CO2 15absorption bands as an example to discuss the temperature dependence of half width, the line intensity and absorption coefficient. In the case of 15absorption band, it is found that temperature dependence of the absorption coefficient is mainly affected by the line intensity while the half width effect is not very important. The line intensity and absorption coefficient depend strongly on temperature in the wings of band; by contraries the dependence is relatively weak in the center of band.