Abstract
A dataset of particle optical properties of highly polluted urban aerosol over the Pearl River Delta, Guangzhou, China is presented. The data were derived from multi-wavelengths Raman and depolarization lidar Polly XT and AERONET sun photometer measurements. The measurement campaign was conducted from Nov 2011 to June 2012. High aerosol optical depth was observed in the polluted atmosphere over this megacity, with a mean value of 0.54 ± 0.33 and a peak value of even 1.9. For the particle characterization the lidar ratio and the linear particle depolarization ratio, both at 532 nm, were used. The mean values of these properties are 48.0 sr ± 10.7 sr for the lidar ratio and 4%+-4% for the particle depolarization ratio, which means most depolarization measurements stayed below 10%. So far, most of these results indicate urban pollution particles mixed with particles arisen from biomass and industrial burning.
Highlights
The Southeast of China, i.e. the Pearl River Delta (PRD) is one of the largest urbanized areas in the world
The data were derived from multi-wavelengths Raman and depolarization lidar PollyXT and AERONET sun photometer measurements
The mean values of these properties are 48.0 sr ± 10.7 sr for the lidar ratio and 4%+-4% for the particle depolarization ratio, which means most depolarization measurements stayed below 10%
Summary
The Southeast of China, i.e. the Pearl River Delta (PRD) is one of the largest urbanized areas in the world. The atmosphere over the PRD is influenced by high urban and industrial activity but is affected by the vicinity of the sea. The predominant atmospheric particles expected in this area may be a mixture of different aerosol types like urban haze, pollution, dust, and sea-salt particles. The atmospheric conditions of the PRD are controlled by subtropical to tropical climate with an annual average temperature of about 22 °C. The main wind direction turns with the change of the location of the Inter Tropical Convergence Zone from north and north-easterly wind directions during the winter months to southern directions during the summer months
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