机载多轴差分吸收光谱技术获取对流层NO_2垂直柱浓度的研究

Determination of tropospheric NO_2 by airborne multi axis differential optical absorption spectroscopy

介绍了一种基于机载平台获取对流层NO_2垂直柱浓度的多轴差分吸收光谱技术.研究了利用差分吸收光谱技术结合不同观测角度的测量光谱反演差分斜柱浓度,并利用辐射传输模型SCIATRAN计算对流层NO_2垂直柱浓度的方法.研究了不同海拔高度、不同地面反照率以及不同太阳天顶角等条件对天顶和天底两个观测角度的大气质量因子的影响.报道了该系统在2008年12月10日在珠三角地区的实验结果,结合天顶和天底两个方向反演得到了珠三角地区对流层NO_2垂直柱浓度的分布信息.同时还将机载测量结果跟安装在珠海市的一台地基多轴差分吸收光谱仪的结果进行了对比,二者相差仅为8%.实验结果表明,机载多轴DOAS技术可以实现对大区域对流层NO_2浓度的快速获取.

The airborne multi axis differential optical absorption spectroscopy（AMAXDOAS） is employed to retrieve tropospheric vertical columns of NO_2.The differential slant columns of NO_2 are retrieved combined with the spectra in different viewing directions by the DOAS method and the vertical columns are calculated with the radiative transfer model SCIATRAN.The dependences of AMF on altitude,surface albedo,and solar zenith angle are studied.The measurement campaign in pearl region delta region on December 10 in 2008 is reported.The NO_2 vertical column distribution is obtained in zenith and nadir directions.The results from airborne multi axis DOAS are compared with those from a ground-based multi axis DOAS in Zhuhai,with a deviation of 0.08.The results show that AMAXDOAS can be used to measure the tropospheric NO2 in a large area within a short time.