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Remote Sens. 2010, 2(9), 2127-2135; doi:10.3390/rs2092127

Determination of Backscatter-Extinction Coefficient Ratio for LIDAR-Retrieved Aerosol Optical Depth Based on Sunphotometer Data

Hong Kong Observatory, 134A Nathan Road, Kowloon, Hong Kong, China
Received: 5 August 2010 / Revised: 6 September 2010 / Accepted: 6 September 2010 / Published: 9 September 2010
(This article belongs to the Special Issue Atmospheric Remote Sensing)
View Full-Text   |   Download PDF [622 KB, 19 June 2014; original version 19 June 2014]   |  

Abstract

Backscattered power data from the Doppler LIght Detection And Ranging (LIDAR) systems at the Hong Kong International Airport (HKIA) could be used to obtain the extinction coefficient of the troposphere by combining with the meteorological optical range (MOR) data from the nearby forward scatter sensor. The Range-height Indicator (RHI) scan of the LIDAR is then utilized to derive the vertical profile of extinction coefficient, which is integrated with height to obtain the aerosol optical depth (AOD). In the retrieval of extinction coefficient profile, there is a power exponent of unknown value relating the backscattered power and the extinction coefficient. This exponent (called the backscatter-extinction coefficient ratio) depends on the optical properties of the aerosol in the air, and is normally assumed to be 1. In the present study, the value of this ratio is established by comparing the AOD measurements by a hand-held sunphotometer and the LIDAR-based AOD estimate in one winter (October 2008 to January 2009), which is the season with the largest number of haze episodes, and one summer-winter-spring period of the following year (July 2009 to May 2010) at HKIA. It is found to be about 1.4. The sensitivity of extinction coefficient profile to the value of the ratio is also examined for two cases in the study period, one good visibility day and one hazy day. View Full-Text
Keywords: LIDAR; sunphotometer; forward scatter sensor; aerosol optical depth LIDAR; sunphotometer; forward scatter sensor; aerosol optical depth
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Chan, P.W. Determination of Backscatter-Extinction Coefficient Ratio for LIDAR-Retrieved Aerosol Optical Depth Based on Sunphotometer Data. Remote Sens. 2010, 2, 2127-2135.

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