Seminars

Lecturer: Dr Andrew Cheng (City University of Hong Kong)
Date: 2005-06-13 10:00
Place: Aniara

Research of atmospheric remote sensing and measurements at City University of Hong Kong

Research has been carried out in Hong Kong in the area of atmospheric remote sensing in relation to urban atmosphere and pollution. City University has been involved in lidar developments and participated in lidar projects of various scale. Examples are a new eye-safe lidar for neighbouring Macao to monitor horizontal extinction and a Raman water vapor lidar for monitoring nocturnal atmospheric water vapor in Hong Kong. A sky radiometer has been operated since 2002, and aerosol volume densities retrieved are compared with MODIS satellite atmospheric optical thickness to understand the long term changes in aerosol characteristics. Internal boundary layers have been monitored using a mobile eye-safe lidar in Hong Kong, and the results are combined with radiosonde data to give an integrated picture of seasonal characteristics of boundary layers. Air pollutants from traffic are being monitored using the concentration of NO2 measured by differential optical absorption spectroscopy. A new scanning spectrometric instrument based on an acoustic optical tunable filter has been developed and used in a short baseline. The same instrument has been used to retrieve the total column density of NO2 from solar light. A portable miniature CCD spectrometer equipped with a GPS sensor has been used to monitor NO2 in the troposphere at different locations utilizing direct solar radiation. The system has even been operated in a small aircraft for airborne monitoring. This presentation will review the developments, progress, outcomes and future prospects of our various projects.

Created 2005-06-10 08:39:37 by Rick McGregor
Last changed 2005-06-10 08:41:02 by Rick McGregor