Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43321
Title: Retrieval of aerosol size distribution from Microtops II sunphotometer in Hong Kong
Authors: Lee, KH
Wong, MS 
Nichol, J 
Chan, PW
Keywords: Aerosol optical thickness
Aerosol size distribution
Microtops II
Spectral extinction fitting technique
Issue Date: 2015
Publisher: Chinese Association for Aerosol Research in Taiwan
Source: Aerosol and air quality research, 2015, v. 15, no. 5, p. 1712-1719 How to cite?
Journal: Aerosol and air quality research 
Abstract: A new method has been developed for retrieving Aerosol Size Distribution (ASD) from spectral aerosol optical thickness (AOT) measured by Microtops II sunphotometer. The rationale of this method is based on a Spectral Extinction Fitting Technique (SEFT) between measured and model-simulated aerosol extinctions. Numerical simulation of aerosol extinctions includes seven aerosol microphysical properties and the resulting total of 64,324,260 datasets were used to compare with Microtops II sunphotometer AOT measurements at five wavelengths (340, 500, 675, 870, and 1020 nm). This SEFT method works directly on AOT measurements and does not require any specific inputs of aerosol properties. The accuracy was examined using AERONET inversion products, and the results show a difference between SEFT and AERONET inversion products of bimodal lognormal volume size concentrations, of ± 10%. The SEFT algorithm was applied for two specific conditions (hazy and clear atmospheres) in Hong Kong, and the corresponding ASD retrievals show reasonable agreements with AERONET inversion products.
URI: http://hdl.handle.net/10397/43321
ISSN: 1680-8584
DOI: 10.4209/aaqr.2015.01.0048
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