Determination of the boundary layer top from lidar backscatter profiles using a Haar wavelet method over Wuhan, China
Determination of the boundary layer top from lidar backscatter profiles using a Haar wavelet method over Wuhan, China
复制标题
使用 Haar 小波方法根据中国武汉激光雷达后向散射剖面确定边界层顶部
DOI：
10.1016/j.optlastec.2012.08.017
复制
发表时间：
2013-07-01
影响因子：
5
通讯作者：
Zhu, Zhongmin
中科院分区：
文献类型：
--
作者：
Mao, Feiyue;Gong, Wei;Zhu, Zhongmin
边界层是大气的下层，它直接受到地球表面的影响，并对地表的强迫做出反应。在这项研究中，利用米氏激光雷达(光探测和测距)系统测量武汉上空的边界层，中国。我们使用Haar小波协方差变换(WCT)方法来寻找激光雷达数据集的边界层顶部。我们彻底分析了混合良好的病例，以及在卷吸带上方、内部和下方检测到的涉及云滴和污染气溶胶的病例。初步结果表明，基于所选参数的小波变换方法能够自动、有效、准确地检测出不被光学厚层遮挡的包裹区的边界层顶和云底。因此，在未来完成长期监测后，可以得出一个大致的模式。此外，BL顶部显示了对云存在的近乎实时的反馈。爱思唯尔有限公司出版。
The boundary layer (BL) is a lower layer of the atmosphere that is directly influenced by the Earth's surface and responds to surface forcing. In this study, a Mie lidar (light detection and ranging) system was utilized to measure the boundary layer over Wuhan, China. We employed the Haar wavelet covariance transform (WCT) method to find the boundary layer top to our lidar dataset. We thoroughly analyzed the well-mixed case and cases involving cloud droplets and pollution aerosols that were detected above, within and below the entrainment zone. In addition, the primary results indicate that the WCT method based on the parameters selected we can detect the BL top and the cloud base of a profile automatically, effectively and accurately, of which the entrainment zone is not concealed by an optical thick layer. Therefore, a general pattern can be concluded after a long-term monitoring is completed in the future. Furthermore, the BL top exhibits nearly a real-time feedback to cloud existence. Published by Elsevier Ltd.