Open AccessTwo-dimensional observation of atmospheric trace gases based on the differential optical absorption spectroscopy technique
Author(s) -
Jin Liu,
Ying Zou,
Fuqi Si,
Haijin Zhou,
Kai Dou,
Yu Wang,
Wenqing Liu
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.164209
Subject(s) - differential optical absorption spectroscopy , trace gas , spectroscopy , absorption (acoustics) , absorption spectroscopy , mixing ratio , materials science , optics , radiation , physics , analytical chemistry (journal) , computational physics , chemistry , meteorology , atmospheric sciences , quantum mechanics , chromatography
A two-dimensional observation method of atmospheric trace gases based on differential optical absorption spectroscopy technique is reported in this paper. The conventional multi-axis differential absorption spectrum system is improved to make the telescope point to different directions. Thereby, the trace gas information of different azimuthal angles and consequently the distribution and variation of pollution gases around the measurement point can be obtained simultaneously. Using this method, NO2 concentration and distribution as well as O4 slant column densities are obtained. High degree of similarity is shown between O4 slant column density simulated by radiation transfer model and the measured data. Based on the measured O4 data, light path information can also be extracted. By combining with radiation transfer model, the light path differences caused by different profile modifications are corrected. The corrected NO2 slant column density is further converted into the volume mixing ratio. By comparing the calculated NO2 mixing ratio with the long-path-differential optical absorption spectroscopy data, the results show good consistency with each other.