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Proceedings Paper

Lidar probing the urban nocturnal boundary layer
Author(s): T. M. Mok; Kang Ming Leung; Aaron HoPui Ho; Johnny C. L. Chan; Chung Tat Ng
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Paper Abstract

Lidar observations to study the nocturnal boundary layer in the atmosphere were made on selected evenings during December 1997 - March 1998 at the City University of Hong Kong (lat. 20 degree(s)20'6', long. 114 degree(s)10'18', at 57 m AMSL), Hong Kong. The ground-based Nd:YAG lidar has been operated to detect the vertical distribution of aerosols in the NBL at a subtropical urban site. It is shown that the vertical relative signal profiles can be employed to determine the heights of the single or multiple nocturnal inversions. In a clear sky and light wind evening transition period, the strong radiative cooling caused the air near the ground becomes stably stratified. The nocturnal inversion starts to emerge soon before sunset and grows vertically as the night progresses. The study also showed that the temporal evolution of the nocturnal inversion depth was rapidly increased soon after sunset and a slower rate in the midnight hours. The results of the study indicate that the vertical aerosol distribution in the multiple-layer is more complicated than that in the single-layer, of NBL. The early morning transition of the NBL is also discussed. A comparison of the lidar aerosol signals and radiosonde measurements was performed to evaluate the consistency of observations between the different systems.

Paper Details

Date Published: 19 August 1998
PDF: 4 pages
Proc. SPIE 3504, Optical Remote Sensing for Industry and Environmental Monitoring, (19 August 1998); doi: 10.1117/12.319565
Show Author Affiliations
T. M. Mok, City Univ. of Hong Kong (Hong Kong)
Kang Ming Leung, City Univ. of Hong Kong (Hong Kong)
Aaron HoPui Ho, City Univ. of Hong Kong (China)
Johnny C. L. Chan, City Univ. of Hong Kong (Hong Kong)
Chung Tat Ng, City Univ. of Hong Kong (Hong Kong)

Published in SPIE Proceedings Vol. 3504:
Optical Remote Sensing for Industry and Environmental Monitoring
Upendra N. Singh; Huanling Hu; Gengchen Wang, Editor(s)

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