Nitrogen Dioxide in the Stratosphere and Troposphere Measured by Ground-Based Absorption Spectroscopy
Nitrogen Dioxide in the Stratosphere and Troposphere Measured by Ground-Based Absorption Spectroscopy
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DOI：
10.1126/science.189.4202.547
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发表时间：
1975-08
期刊：
影响因子：
56.9
通讯作者：
J. Noxon
中科院分区：
文献类型：
--
作者：
J. Noxon
平流层中的NO2丰度是根据太阳和月亮升起和落下的地面光谱以及4500埃附近的黄昏天空光谱确定的。这些光谱是在弗里茨峰天文台拍摄的，该天文台位于科罗拉多山脉海拔3公里处。平流层成分的分离需要在相对未受污染的地点进行观测;在科罗拉多山脉直接测量对流层吸收，往往得出对流层混合比的上限为十亿分之0.1。平流层的NO2丰度在夜间比白天高两到三倍，并且在阳光照射的白天显著增加;这些变化与白天平流层中NO2和N2 O 5的光解分解有关。NO3的吸收被寻找，但没有发现;结果设定了平流层中NO3与NO2的夜间丰度比的上限为2%。
The NO2 abundance in the stratosphere has been determined from ground-based spectra of the rising and setting sun and moon and of the twilight sky near 4500 angstroms. The spectra were taken at the Fritz Peak Observatory, at an altitude of 3 kilometers in the Colorado mountains. Separation of the stratospheric contribution requires observations at a relatively unpolluted site; direct measurement of the tropospheric absorption in the Colorado mountains often yields an upper limit on the tropospheric mixing ratio of 0.1 part per billion. The stratospheric NO2 abundance is two to three times greater at night than during the day and increases significantly during the course of a sunlit day; these changes are related to photolytic decomposition of NO2 and N2O5 in the daytime stratosphere. Absorption by NO3 was sought but not found; the results set an upper limit of 2 percent on the nighttime abundance ratio of NO3 to NO2 in the stratosphere.