联合测云体制下的光学厚度反演技术研究  

Optical Depth Inversion Technique Under Joint Cloud Measurement System

作　　者：张婷 刘磊 高太长[2] 胡帅 Zhang Ting;Liu Lei;Gao Taichang;Hu Shuai(Hebei Provincial Meteorological Technical Equipment Center,Shijiazhuang,Hebei 050021,China;College of Meteorology and Oceanography,National University of Defense Technology,Nanjing,Jiangsu 211101,China)

机构地区：[1]河北省气象技术装备中心,河北石家庄050021 [2]国防科技大学气象海洋学院,江苏南京211101

出　　处：《激光与光电子学进展》2020年第19期268-273,共6页Laser & Optoelectronics Progress

摘　　要：为提高地基红外测云系统全天空云检测的准确性,通过辐射传输模式SBDART模拟大气向下红外辐射与云光学厚度之间的对应关系,发现利用云的光学厚度拟合曲线反演云的光学厚度具有可行性,然后在此基础上提出了一种利用红外和激光联合反演云光学厚度的方法。通过建立更精确的适用于特定地区和特定季节的大气廓线和水汽含量,利用激光消光廓线较精确地反演气溶胶和云底高,并将以上获取的大气参数代入辐射传输模式SBDART,模拟得到了云的光学厚度反演曲线,从而反演出全天空云的光学厚度分布。实验结果表明,通过单层云和两层云的光学厚度反演曲线反演得到的全天空光学厚度分布与全天空辐射分布保持一致,能够较清晰地分辨全天空不同高度云层的光学厚度。To improve the accuracy of all-sky cloud detection of ground-based infrared cloud-measuring system,the corresponding relation between downwelling infrared radiation and optical depth of clouds was simulated by Santa Barbara DISTORT Atmospheric Radiative Transfer(SBDART)model.The simulation result shows that it is feasible to invert optical depth by fitting its curve.On this basis,a new method under a combination of infrared and laser technologies was proposed.First,more accurate atmospheric profiles and precipitable water vapor applicable to specific regions and seasons were established.Simultaneously,the aerosol and cloud base height were inverted by laser extinction profiles.Second,the atmospheric parameters obtained above were substituted into SBDART to simulate the cloud optical depth inversion curve at zenith.Finally,the optical depth distribution of the all-sky clouds could be inverted by the curve.The experimental results reveal that the distribution of the all-sky optical depth obtained from the inversion curve of single-and two-layer clouds is consistent with the distribution of the all-sky radiation.Moreover,the optical depth of clouds at different heights in the all-sky is clearly distinguished.

关 键 词：遥感 光学厚度 激光 红外 联合测云 

分 类 号：P412.15[天文地球—大气科学及气象学]