摘要
基于近红外被动差分吸收光谱技术(IR-DOAS)反演了大气中水汽柱浓度。从Hitran数据库中获取高分辨率截面,利用Voigt线型进行不同温压条件下的线性展宽,获得不同反演吸收截面。以仰角为90°的光谱作为参考谱,对光谱进行反演,获取垂直柱浓度。通过与太阳光度计(CE-318)进行对比发现,结果具有很好的趋势一致性,线性相关系数为0.99,且IR-DOAS的反演值与CE-318结果的差值在IR-DOAS反演误差范围内。将其应用于水汽斜柱浓度的空间分布获取发现,垂直方向水汽斜柱浓度随仰角的变化呈梯度变化,水平方向水汽斜柱浓度随观测方位角的变化几乎不变,分布均匀。
The atmospheric water vapor column density is retrieved based on near infrared passive differential optical absorption spectroscopy technique(IR-DOAS). The high-resolution cross sections are obtained from the Hirtran database and Voigt profiles are used for linear broadening under different temperature and pressure conditions to obtained different inversion absorption cross section. The spectra with elevation angle of 90° is selected as reference spectra to retrieve H2O column to obtain the vertical column density. Compared with solar photometer(CE-318), it is found that the results are in good trend consistency with IR-DOAS, and the linear correlation coefficient is 0.99. The differences between inversion values of IR-DOAS and CE-318 are within the range of inversion error of IR-DOAS. It is found that the slant column density of water vapor in vertical direction varies gradiently with elevation angle, while the slant column density of water vapor in horizontal direction nearly uniform with observation azimuth, and the distribution is uniform.
作者
王汝雯
谢品华
徐晋
李昂
Wang Ruwen;Xie Pinhua;Xu Jin;Li Ang(Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230026,China;CAS Center for Excellence in Urban Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen,Fujian361021,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2019年第2期9-16,共8页
Acta Optica Sinica
基金
国家自然科学基金重点项目(41530644)
关键词
大气光学
近红外差分吸收
水汽测量
光学遥感
环境污染监测
水汽空间分布
atmospheric optics
near-infrared differential optical absorption spectroscopy
water vapor measurement
optical remote sensing
environmental pollution monitoring
spatial distribution of water vapor
