摘要
2009年6月20日～7月20日, 利用中国海洋大学研制 的车载多普勒激光雷达系统在珠海市国家气候观象台（N22° 4’,E113°12’）进行了大气观测实验,探测垂直高度范围为0.3～20.0km,共获得有效垂直探测数据56组。根 据激光雷达回波信号特点,以微分零交叉法为基础,通过在反演云底过程中设置3种阈值和 相邻云层间大气 的洁净程度决定是否融合为同一层等措施改进算法。最后,对不同时刻、代表不同光学特性 的回波廓线进行了 反演,反演的云底高度最小值和最大值分别为0.55km和13. 51km 。结果表明,本文算法能够实现较为准确的云底探测,报告精度为10m ,具有良好的应用前景。
Lidar or laser radar is widely used in the spatial and temporal distri bution detection of atmospheric aerosols and clouds because of its unique advantages in technology. From June 20to July 20,9,the mobile Doppler wind lidar developed by Ocean University of China was o perated in Zhuhai National Climate Observatory（N22° 4’,E113°12’）for a tmospheric observation,especially for winds, aerosols and clouds profiling.This paper focuses on the lidar observation of at mospheric cloud and cloud base height retrieval.With the detection range of 0.3-20km,56groups of effec tive atmospheric backscattering profile data were obtained and recorded.Cloud-base height is st udied and retrieved with the improved differential zero-crossing method based on the measuring backscatterin g data.According to the measurement time and signal to noise ratio,three different thresholds are inves tigated and added to the zero-crossing process of the backscattering profile.Compared with the clear ai r,retrieved adjacent layers merging into one layer or discriminated into different layers are also considere d.The result statistics of this observation period show that the minimum and maximum of the observed cloud base height are 0.55km and 13.51km,respectively.It is found that the algorithm can realize precise detection of cloud base automatically with a 10m report height accuracy.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第11期2192-2197,共6页
Journal of Optoelectronics·Laser
基金
海洋公益性行业科研专项(201205036-5)
中国气象科学院灾害天气国家重点实验室开放基金(2010LASW-A07)
城市气象科学研究基金(UMRF201002)资助项目
关键词
激光雷达
微分零交叉法
云底高度
lidar
differential zero-crossing method~ cloud-base height
作者简介
宋小全（1976-），男，山东省莱州人，博士，硕士生导师，主要从事激光遥感遥测研究．E-mail： songxq@ ouc. edu. cn
