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基于直射太阳光红外吸收光谱技术的大气中CH4柱浓度遥测研究

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Keywords: 大气光学,甲烷,柱浓度,遥测,红外吸收光谱技术

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Abstract:

为了研究甲烷气体柱浓度探测方法,文中介绍了一种基于直射太阳光红外吸收光谱技术的遥测系统,并利用该系统在合肥地区进行了连续观测。从太阳吸收光谱中实时测量了整层大气透过率;采用逐线积分方法模拟计算了整层大气透过率;基于非线性最小二乘光谱反演算法从实测整层大气透过率中反演了甲烷气体柱浓度和氧气柱浓度,并以氧气柱浓度为内标函数获得了甲烷干空气柱体积混合比,精密度优于2%。将本系统测量的2012年9月25日12时到15时CH4干空气柱体积混合比均值与此时段过境本站点区域的日本温室气体卫星的CH4观测结果进行了比较,两者偏差小于1%。可见,该系统和方法是一种有效的甲烷气体柱浓度探测系统和方法,具有较高精度。

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