Detection and analysis of cloud height in Hefei with lidar

CHEN Zhen-yi; ZHANG Yu-jun; LIU Wen-qing; HE Jun-feng; RUAN Jun

doi:10.3969/j.issn.1001-3806.2010.06.004

In order to determine the cloud base,cloud peak and cloud top from the lidar backscatter profile,the differential retrieval method was put forward.The study was focused on distinguishing the single layer from the multi-layer cloud when confronted several backscatter signal peaks.The structure of the lidar used in the experiment was introduced;then the cloud height,cloud thickness and cloud optical depth detected from the lidar in May in Hefei was investigated.The related theory analysis and experiment were presented.In order to test the feasibility of the cloud detection approach,the results obtained from the lidar were compared with those obtained from Finland ceilometer Vaisala (detecting range:0km～7km) after both the instruments aiming at the cloud in the same region.Results show that the data below 7km were identical;the data above the 7km were consistent with those from satellite SAGE Ⅱ.The high layer clouds detected in Hefei,also called cirrus,were mostly thin cirrus with the cloud peak varying from 9km to 12km.The method of cloud detection is helpful for the future cloud retrieval and satellite validation.

Detection and analysis of cloud height in Hefei with lidar

Corresponding author: LIU Wen-qing, wqliu@aiofm.ac.cn;

1. Key Laboratry of Enviromental Optics & Technology, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Received Date: 2009-11-26

Accepted Date: 2009-12-24

Available Online: 2010-11-25

Abstract: In order to determine the cloud base,cloud peak and cloud top from the lidar backscatter profile,the differential retrieval method was put forward.The study was focused on distinguishing the single layer from the multi-layer cloud when confronted several backscatter signal peaks.The structure of the lidar used in the experiment was introduced;then the cloud height,cloud thickness and cloud optical depth detected from the lidar in May in Hefei was investigated.The related theory analysis and experiment were presented.In order to test the feasibility of the cloud detection approach,the results obtained from the lidar were compared with those obtained from Finland ceilometer Vaisala (detecting range:0km～7km) after both the instruments aiming at the cloud in the same region.Results show that the data below 7km were identical;the data above the 7km were consistent with those from satellite SAGE Ⅱ.The high layer clouds detected in Hefei,also called cirrus,were mostly thin cirrus with the cloud peak varying from 9km to 12km.The method of cloud detection is helpful for the future cloud retrieval and satellite validation.

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Reference (9)

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Detection and analysis of cloud height in Hefei with lidar

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