摘要
研究了一种用地基天顶光-天空光光谱数据反演大气NO2倾斜柱体密度的有效方法。利用该方法计算了同一方位不同倾角（10°～85°）下的倾斜柱体密度（在0.5～11×1016 molecule·cm^-2范围），以及同一倾角不同方位的NO2倾斜柱体密度（1016～1017molecule·cm^-2量级）。结果与实际大气状况有很好的相关性。不同方位及倾角的NO2倾斜柱体密度不同，体现出角空间分布特征。该方法中，由同一仪器同时采集天顶光光谱和其他方向的天空光光谱，提高了测量准确度。该方法有利于实时监测空间任意方向NO2的含量，尤其靠近地面的NO2局部污染，更适合多阴雨地区（在地面上很难采集到良好的直射太阳光谱）的污染监测。
A novel approach to retrieving atmosphere NO2 slant column density is described, in which the sunlight scattered in the zenith direction and the skylight are used as the light sources. The slant column density of the same azimuth but different obliquities, which are between 0. 5 × 10^16 and 11 × 10^16 molecule · cm^-2 , with the angle from 85° to 10°, as well as that of the same obliquity but different azimuths, which are between 10^16 and 10^17 molecule ·cm^-2, were calculated. The study ind!cates that the results have good correlation with real atmosphere status. The angle spatial distribution could be embodied by the difference of NO2 slant column density in different azimuths and obliquities. The reference spectrum and sample spectrum were collected with the same instrument at the same time, so the measurement accuracy has been improved. This method favored not only real-time monitoring NO2 content of space arbitrary direction, especially near the ground NO2 pollution emergencies, but also overcast and rainy areas where it is very difficult to collect good direct solar spectrum.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期1901-1905,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(60478044)资助
关键词
天顶光光谱
天空光光谱
大气NO2
角空间
Zenith-light spectra
Sky-light spectra
Atmospheric NO2
Angle spatial distribution
